1. This corresponds to a 15-point recitation question. 2. Each Chem 2 student should choose a website where information can be gathered to answer the question. NO REPETITION OF WEBSITE! 3. In the comment box, enter the following: a. Name b. Section c. Website Used d. Your answer 4. If the website is not included, NO POINT WILL BE GIVEN even if the answer is correct.
Osmotic pressure is the pressure which needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane.
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FACUNDO
2/27/2012 11:11:30 pm
Abong, how about the first question? :)
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MACABITAS ROEL BRYAN P.
2/27/2012 11:12:34 pm
a. Name MACABITAS ROEL BRYAN P.
b. Section 3B
c. Website Used http://physioweb.uvm.edu
d. Your answer
Osmosis:
Osmosis is the diffusion of water down its concentration gradient. Normally one thinks of water as the solvent, and focuses on the concentration of the solutes, but water itself has a concentration in any solution. Pure water has a molecular weight of 18 grams/mole, so its concentration is approximately 55 Molar!
http://www.thefreedictionary.com
osmotic pressure
n.
The pressure exerted by the flow of water through a semipermeable membrane separating two solutions with different concentrations of solute.
Osmosis is the movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration, aiming to equalize the solute concentrations on the two sides.
osmotic pressure
n.
The pressure exerted by the flow of water through a semipermeable membrane separating two solutions with different concentrations of solute.
Reply
FACUNDO
2/27/2012 11:13:55 pm
De Vera, what website did you use?
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de vera
2/27/2012 11:22:09 pm
I posted it
I'm wondering why It did not appear
de vera 2
2/27/2012 11:24:01 pm
http://en.wikipedia.org/wiki/Osmosis for osmosis
http://www.thefreedictionary.com/osmotic+pressure for osmotic pressure
De Vera, Ezekiel
2/27/2012 11:30:36 pm
a.Name: De Vera, Ezekiel L.
b. Section: 2
c. Website Used: http://en.wikipedia.org/wiki/Osmosis for osmosis
http://www.thefreedictionary.com/osmotic+pressure for osmotic pressure
d. Your answer
Osmosis is the movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration, aiming to equalize the solute concentrations on the two sides.
osmotic pressure
n.
The pressure exerted by the flow of water through a semipermeable membrane separating two solutions with different concentrations of solute.
De Vera, Ezekiel L.
2/28/2012 12:00:49 am
a.Name: De Vera, Ezekiel L.
b. Section: 2
c. Website Used: http://en.wikipedia.org/wiki/Osmosis
http://www.thefreedictionary.com/osmotic+pressure
d. Your answer
Osmosis is the movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration, aiming to equalize the solute concentrations on the two sides.
osmotic pressure
n.
The pressure exerted by the flow of water through a semipermeable membrane separating two solutions with different concentrations of solute.
JAMES ABONG - 3B
2/27/2012 11:13:59 pm
Sorry mam :)) tama po ba?
http://en.wikipedia.org/wiki/Osmosis
Osmosis is the movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration, aiming to equalize the solute concentrations on the two sides. It may also be used to describe a physical process in which any solvent moves, without input of energy, across a semipermeable membrane (permeable to the solvent, but not the solute) separating two solutions of different concentrations. Although osmosis does not require input of energy, it does use kinetic energy and can be made to do work.
http://en.wikipedia.org/wiki/Osmotic_pressure
Osmotic pressure is the pressure which needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane.
De Vera, what I meant is specific website...Look at the other replies...
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de vera
2/27/2012 11:41:37 pm
mam pa check po ng akin kung ok n po...
mc valmores
2/28/2012 10:54:48 pm
ang Gulo po kase ng Site Di ko Alam kung saan ehh :'(
Chavez, Abegaile D.
2/27/2012 11:15:13 pm
a. Chavez, Abegaile D.
b. 3B
c. www.google.com
d. Osmosis is the movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration, aiming to equalize the solute concentrations on the two sides. Osmotic pressure is the pressure which needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane.
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FACUNDO
2/27/2012 11:16:42 pm
Google is not a website, Chavez! :)
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Chavez
2/27/2012 11:20:25 pm
naulit ko na po mam..sorry po ngkamali.. :))
Marc Steven Martinez - 3B
2/27/2012 11:17:25 pm
http://www.biology-online.org/dictionary/Osmosis
Diffusion of a solvent (usually water molecules) through a semipermeable membrane from an area of low solute concentration to an area of high solute concentration.
osmosis (ŏzmō`sĭs), transfer of a liquid solvent through a semipermeable membrane that does not allow dissolved solids (solutes) to pass. Osmosis refers only to transfer of solvent; transfer of solute is called dialysis. In either case the direction of transfer is from the area of higher concentration of the material transferred to the area of lower concentration. This spontaneous migration of a material from a region of higher concentration to a region of lower concentration is called diffusion.
osmotic pressure [äz′mäd·ik ′presh·ər]
(physical chemistry)
The applied pressure required to prevent the flow of a solvent across a membrane which offers no obstruction to passage of the solvent, but does not allow passage of the solute, and which separates a solution from the pure solvent.
The applied pressure required to prevent passage of a solvent across a membrane which separates solutions of different concentration, and which allows passage of the solute, but may also allow limited passage of the solvent. Also known as osmotic gradient.
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FACUNDO
2/27/2012 11:20:11 pm
Flora, website please!
Reply
Flora-3b
2/27/2012 11:33:04 pm
a. Name : Flora Rommel L.
b. Section: 3B
c. Website Used : http://encyclopedia2.thefreedictionary.com/osmotic+pressure for osmotic pressure
http://encyclopedia2.thefreedictionary.com/osmosis for osmosis
d. Your answer:
osmosis (ŏzmō`sĭs), transfer of a liquid solvent through a semipermeable membrane that does not allow dissolved solids (solutes) to pass. Osmosis refers only to transfer of solvent; transfer of solute is called dialysis. In either case the direction of transfer is from the area of higher concentration of the material transferred to the area of lower concentration. This spontaneous migration of a material from a region of higher concentration to a region of lower concentration is called diffusion.
osmotic pressure [äz′mäd·ik ′presh·ər]
(physical chemistry)
The applied pressure required to prevent the flow of a solvent across a membrane which offers no obstruction to passage of the solvent, but does not allow passage of the solute, and which separates a solution from the pure solvent.
The applied pressure required to prevent passage of a solvent across a membrane which separates solutions of different concentration, and which allows passage of the solute, but may also allow limited passage of the solvent. Also known as osmotic gradient.
Flora 3b
2/27/2012 11:49:01 pm
Mam ok na po ba ung akin?
Flora, Rommel L.-3b
2/28/2012 12:03:19 am
a. Name : Flora Rommel L.
b. Section: 3B
c. Website Used : http://encyclopedia2.thefreedictionary.com/osmotic+pressure
osmosis (ŏzmō`sĭs), transfer of a liquid solvent through a semipermeable membrane that does not allow dissolved solids (solutes) to pass. Osmosis refers only to transfer of solvent; transfer of solute is called dialysis. In either case the direction of transfer is from the area of higher concentration of the material transferred to the area of lower concentration. This spontaneous migration of a material from a region of higher concentration to a region of lower concentration is called diffusion.
osmotic pressure [äz′mäd·ik ′presh·ər]
(physical chemistry)
The applied pressure required to prevent the flow of a solvent across a membrane which offers no obstruction to passage of the solvent, but does not allow passage of the solute, and which separates a solution from the pure solvent.
The applied pressure required to prevent passage of a solvent across a membrane which separates solutions of different concentration, and which allows passage of the solute, but may also allow limited passage of the solvent. Also known as osmotic gradient.
flora 3b
2/27/2012 11:20:59 pm
http://encyclopedia2.thefreedictionary.com/osmotic+pressure for osmotic pressure
http://encyclopedia2.thefreedictionary.com/osmosis for osmosis
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Chavez,Abegaile D.
2/27/2012 11:18:33 pm
a. Chavez, Abegaile D.
b. 3B
c. http://en.wikipedia.org/wiki/Osmotic_pressure
http://en.wikipedia.org/wiki/Osmosis
d. Osmosis is the movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration, aiming to equalize the solute concentrations on the two sides. Osmotic pressure is the pressure which needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane.
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FACUNDO
2/27/2012 11:19:36 pm
Abong used wikipedia already!
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Cueto, Patricia Anne H.
2/27/2012 11:18:44 pm
a. Name : Patricia Anne H. Cueto
b. Section - 3b
c. Website Used -
-http://www.vivo.colostate.edu/hbooks/cmb/cells/pmemb/osmosis.html
-http://www.yourdictionary.com/osmotic-pressure
d. Osmosis-
Osmosis is the net movement of water across a selectively permeable membrane driven by a difference in solute concentrations on the two sides of the membrane. A selectively permiable membrane is one that allows unrestricted passage of water, but not solute molecules or ions.
Osmotic pressure is the force caused by a solution passing through a semipermeable surface by osmosis, which is equal to the force required to resist the solution from passing back through the surface.
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Cueto, Patricia Anne H.
2/27/2012 11:27:13 pm
Ok na po ba?
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Castro, Michael
2/27/2012 11:18:45 pm
Castro, Michael Carlson
3b
http://dictionary.reference.com/browse/on
the tendency of a fluid, usually water, to pass through a semipermeable membrane into a solution where the solvent concentration is higher, thus equalizing the concentrations of materials on either side of the membrane.
http://www.biology-online.org/dictionary/Osmotic_pressure
The osmotic pressure is defined to be the pressure required to maintain an equilibrium, with no net movement of solvent.
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FACUNDO
2/27/2012 11:25:03 pm
Good!
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Reyes, Woodrow Carlo B.
2/27/2012 11:20:32 pm
Osmosis is a process in which a fluid passes through a semipermeable membrane, moving from an area in which a solute such as salt is present in low concentrations to an area in which the solute is present in high concentrations. The end result of osmosis, barring external factors, will be equal amounts of fluid on either side of the barrier, creating a state which is known as “isotonic.” The fluid most commonly used in demonstrations of osmosis is water, and osmosis with a wide variety of fluid solutions is key for every living organism on Earth, from humans to plants.
http://www.wisegeek.com/what-is-osmosis.htm
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Castro, Michael
2/27/2012 11:27:05 pm
mam ok na po?
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Reyes, Woodrow Carlo B
2/27/2012 11:23:20 pm
maam ok na po ba yung sakin?
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FACUNDO
2/27/2012 11:24:29 pm
Reyes, ok na!
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Largo, Dann Erikson M.
2/27/2012 11:26:52 pm
LARGO, DANN ERIKSON M.
3B
http://www.trivology.com/articles/1784/what-is-osmosis.html
The term “osmosis” originates from the “words” “exosmose” and “endosmose”. Osmosis is a process in which a fluid passes through semi permeable membrane. The movement of solvent molecules occurs from the region of lower concentration to a region of higher concentration.
Osmotic pressure of a solution can be defined as force per unit area required to prevent passage of water across a selectively permeable membrane. Osmotic pressure intends to restrict the movement to the solution of greater concentration. Osmotic pressure is primarily a colligative property implying that the property depends upon the concentration of the solute rather than the identity of the solute. The difference in concentration between the two solutions is termed as the osmotic gradient. The difference in concentration exists across either sides of the semi-permeable membrane.
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Largo, Dann
2/27/2012 11:28:41 pm
Mam.. okay na po yung akin? :))))
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Reyes, Woodrow Carlo B.
2/27/2012 11:27:00 pm
thankyou maam :)) goodnight! GODBLESS!!
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Chavez, Abegaile D.
2/27/2012 11:29:47 pm
a. Chavez, Abegaile D.
b. 3B
c. http://www.newworldencyclopedia.org/entry/Osmosis
http://medical-dictionary.thefreedictionary.com/osmotic+pressure
d. Osmosis is the movement of water molecules across a semi-permeable membrane from a region of low solute potential to an area of high solute potential (or equivalently, from a region of high solvent potential to a region of low solvent potential). The partially permeable membrane must be permeable to the solvent (the solution), but not to the solute (the substance dissolved in the solution), resulting in a pressure gradient across the membrane.
Osmotic pressure the pressure required to prevent osmosis through a semipermeable membrane between a solution and pure solvent; it is proportional to the osmolality of the solution.
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Chavez
2/27/2012 11:32:15 pm
mam ok na po ba yung akin?? :))
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capil, edd
2/27/2012 11:34:33 pm
a.) capil, edd yasser g.
b.) 3b
c.) www.newworldencyclopedia.org/entry/Osmosis
d.) Osmosis is the movement of water molecules across a semi-permeable membrane from a region of low solute potential to an area of high solute potential (or equivalently, from a region of high solvent potential to a region of low solvent potential). The partially permeable membrane must be permeable to the solvent (the solution), but not to the solute (the substance dissolved in the solution), resulting in a pressure gradient across the membrane.
Osmosis is an important topic in biology because it provides the primary means by which water is transported into and out of cells. Human creativity has also learned to take advantage of principles related to osmosis for such useful processes as desalination, water purification, water treatment, and food processing.
e.)Osmosis is a selective diffusion process driven by the internal energy of the solvent molecules. It is convenient to express the available energy per unit volume in terms of "osmotic pressure". It is customary to express this tendency toward solvent transport in pressure units relative to the pure solvent.
d. osmosis : Two different solute and solution make it equal and appear the membrane between two fluids.
osmotic pressure : The moving forces of the different fluids to meet on center.
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ALONZO, Joseph Patrick S. Section 4C
2/28/2012 12:37:59 am
a. ALONZO, Joseph Patrick S.
b. 4C
c. http://www.askiitians.com/iit_jee-Solutions/Osmosis_and_Osmotic_Pressure
d.OSMOSIS AND OSMOTIC PRESSURE
Osmosis:
When a semi-permeable membrane is placed between a solution and a solvent, it is observed that solvent molecules enter the solution and the volume of solution increases. It is also observed that if two solutions of unequal concentrations are separated by a semipermeable membrane, the solvent molecules from a solution of lower concentration move towards a solution of higher concentration. This phenomenon was first observed by Abbe Nollet (1748) and termed as Osmosis (reek, osmos = to push). Osmosis is defined as the spontaneous flow of solvent molecules through semipermeable membrane from a pure solvent to a solution or from a dilute to a concentrated solution.
The phenomenon of osmosis can be demonstrated by the following experiment
Two eggs of same size are taken and their outer hard shell is removed by dissolving in dilute hydrochloric acid. One of the eggs is placed in distilled water and the other in saturated salt solution.
After sufficient time, it is noticed that the egg placed in water swells up and that placed in salt solution shrinks. In the first case water enters the concentrated egg fluid while in the second case water comes out of the egg as salt solution is more concentrated thatn egg fluid.
Osmotic pressure
A porous pot is taken and a semipermeable membrane of copper ferrocyanide is deposited in its walls. It is fitted with a long glass with the help of a rubber stopper. It is filled with concentrated aqueous sugar solution and placed is distilled water. Osmosis occurs and the level of the solution in glass tube rises over a period of time. After a few days, the level becomes stationery. At this equilibrium state the hydrostatic pressure of the liquid column exactly balances the tendency which enables the water molecules to pass through semipermeable membrane.
The hydrostatic pressure developed as a result of osmosis is a measure of osmotic pressure of the solution. Osmotic pressure is also defined as the hydrostatic pressure built up on the solution which just stops the osmosis.
Osmosis pressure = hydrostatic pressure
π = hdg
where h = increase in level in the tube of unit cross section, d = density of solution and g = acceleration due to gravity.
Actually, this will not be an exact measure of osmotic pressure of the solution originally taken because sufficient dilution has taken place with time.
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Millares, Ralph Spencer R.
2/28/2012 03:01:58 am
a.Millares, Ralph Spencer R.
b. 4c
c.http://oxforddictionaries.com/definition/osmotic%2Bpressure?q=osmotic+pressure - for osmotic pressure
http://oxforddictionaries.com/definition/osmosis?q=osmosis
- for osmosis
d.
OSMOSIS -1 Biology & Chemistry a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.
OSMOTIC PRESSURE
noun
Chemistry
the pressure that would have to be applied to a pure solvent to prevent it from passing into a given solution by osmosis, often used to express the concentration of the solution.
The passage of water across a semipermeable membrane from a dilute solution to a more concentrated solution is called OSMOSIS. If a cell does not compensate for the effects of osmosis it will gradually swell up with water and burst.
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casama
2/28/2012 06:05:02 am
OSMOTIC PRESSURE
Osmosis always moves a solvent in one direction only, from a less concentrated solution to a more concentrated solution. As osmosis proceeds, pressure builds up on the side of the membrane where volume has increased. Ultimately, this pressure prevents more water from entering, and osmosis stops. The osmotic pressure of a solution is the pressure needed to prevent osmosis from occurring.
a) Lim, Don Nathaniel G.
b) 4C
c) http://www.ausetute.com.au/osmoticp.html
d) Osmotic pressure arises when two solutions of different concentrations, or a pure solvent and a solution, are separated by a semipermeable membrane. Molecules such as solvent molecules that can pass through the membrane will migrate from the side of higher concentration to the side of lower concentration in a process known as osmosis.
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Castro, John David B.
2/28/2012 09:12:09 am
A. Castro, John David B.
B. 3B
C.http://www.vivo.colostate.edu/hbooks/cmb/cells/pmemb/osmosis.html
D.Osmosis , Large quantities of water molecules constantly move across cell membranes by simple diffusion, but, in general, net movement of water into or out of cells is negligible. For example, it has been estimated that an amount of water equivalent to roughly 250 times the volume of the cell diffuses across the red blood cell membrane every second; the cell doesn't lose or gain water because equal amounts go in and out.
There are, however, many cases in which net flow of water occurs across cell membranes and sheets of cells. An example of great importance to you is the secretion of and absorption of water in your small intestine. In such situations, water still moves across membranes by simple diffusion, but the process is important enough to warrant a distinct name - osmosis.
Osmosis is the net movement of water across a selectively permeable membrane driven by a difference in solute concentrations on the two sides of the membrane. A selectively permiable membrane is one that allows unrestricted passage of water, but not solute molecules or ions.
Osmotic pressure is defined as the hydrostatic pressure required to stop the flow of water, and thus, osmotic and hydrostatic pressures are, for all intents and purposes, equivalent. The membrane being referred to here can be an artifical lipid bilayer, a plasma membrane or a layer of cells.
The osmotic pressure P of a dilute solution is approximated by the following:
P = RT (C1 + C2 + .. + Cn)
where R is the gas constant (0.082 liter-atmosphere/degree-mole), T is the absolute temperature, and C1 ... Cn are the molar concentrations of all solutes (ions and molecules).
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Castro, John David B.
2/28/2012 09:16:02 am
A. Castro, John David B.
B. 3B
C. http://chemed.chem.wisc.edu/chempaths/GenChem-Textbook/Osmotic-Pressure-854.html
D. Osmosis- The passage of solvent through a semipermeable membrane from a region of higher concentration of solute to a region of lower concentration of solute.
Osmotic Pressure
Suppose we have a solution of sugar in water separated by a membrane from a sample of pure water. The membrane is porous, but the holes are not large enough to allow sucrose molecules to pass through from one side to the other while still being large enough to allow water molecules to pass freely through them. In such a situation, water molecules will be hitting one side of the membrane more often than the other. As a result, water molecules will move more often from right to left through the membrane in the animation than they will in the reverse direction. There will thus be a net flow of water from the compartment containing pure solvent, through the membrane, into the compartment containing the sucrose. This is another example of the tendency for moving molecules to become more thoroughly mixed together. The following movie shows this process, called osmosis.
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Mina, Jeozzel Zeoz L.
2/28/2012 11:41:18 am
a.) Mina, Jeozzel Zeoz L.
b.) 4C
c.) http://dictionary.reference.com/browse/osmotic+pressure
http://dictionary.reference.com/browse/osmosis
d. ) OSMOSIS
-the tendency of a fluid, usually water, to pass through a semipermeable membrane into a solution where the solvent concentration is higher, thus equalizing the concentrations of materials on either side of the membrane.
OSMOTIC PRESSURE
-
the force that a dissolved substance exerts on a semipermeable membrane, through which it cannot penetrate, when separated by it from pure solvent.
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Alipio, Daryl Jun -3B
2/28/2012 11:50:18 am
Definition of osmosis: “Osmosis is the passage of water from the region of high water concentration through a semi permeable membrane to a region of low water concentration”.
So to define osmosis we should first know about it. Osmosis was first discovered by Jean Antoine Nollet in 1748. Osmosis plays an important role in biological and chemical science. Everyone can see the example of osmosis in normal life just like when you deep sponge into the water so water goes into the sponge and makes the sponge expand reason is osmosis.
We define Osmosis as “Osmosis is the passage of water from a dilute solution via a membrane which is semi permeable to a more concentrate solution”.
http://defineosmosis.com/
Reply
alipio,daryl jun-3b
2/28/2012 11:55:42 am
Osmotic pressure is the pressure which needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane.
The phenomenon of osmotic pressure arises from the tendency of a pure solvent to move through a semi-permeable membrane and into a solution containing a solute to which the membrane is impermeable. This process is of vital importance in biology as the cell's membrane is selective towards many of the solutes found in living organisms.
In order to visualize this effect, imagine a U-shaped clear tube with equal amounts of water on each side, separated by a membrane at its base that is impermeable to sugar molecules (made from dialysis tubing). Sugar has been added to the water on one side. The height of the water on each side will change proportional to the pressure of the solutions.
Osmotic pressure causes the height of the water in the compartment containing the sugar to rise, due to movement of the pure water from the compartment without sugar into the compartment containing the sugar water. This process will stop once the pressures of the water and sugar water toward both sides of the membrane are equated
a.)alipio,daryl jun
b.)3b
c.)http://defineosmosis.com/
http://www.facebook.com/pages/Osmotic-pressure/113708745306382
osmosis
Definition of osmosis: “Osmosis is the passage of water from the region of high water concentration through a semi permeable membrane to a region of low water concentration”.
So to define osmosis we should first know about it. Osmosis was first discovered by Jean Antoine Nollet in 1748. Osmosis plays an important role in biological and chemical science. Everyone can see the example of osmosis in normal life just like when you deep sponge into the water so water goes into the sponge and makes the sponge expand reason is osmosis.
We define Osmosis as “Osmosis is the passage of water from a dilute solution via a membrane which is semi permeable to a more concentrate solution”.
http://defineosmosis.com/
osmotic pressure
Osmotic pressure is the pressure which needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane.
The phenomenon of osmotic pressure arises from the tendency of a pure solvent to move through a semi-permeable membrane and into a solution containing a solute to which the membrane is impermeable. This process is of vital importance in biology as the cell's membrane is selective towards many of the solutes found in living organisms.
In order to visualize this effect, imagine a U-shaped clear tube with equal amounts of water on each side, separated by a membrane at its base that is impermeable to sugar molecules (made from dialysis tubing). Sugar has been added to the water on one side. The height of the water on each side will change proportional to the pressure of the solutions.
Osmotic pressure causes the height of the water in the compartment containing the sugar to rise, due to movement of the pure water from the compartment without sugar into the compartment containing the sugar water. This process will stop once the pressures of the water and sugar water toward both sides of the membrane are equated
a. Name : Austria, James Jeremiah Ambrose V.
b. Section : 4C
c. Website Used :
http://www.merriam-webster.com/dictionary/osmosis
http://www.merriam-webster.com/dictionary/osmotic%20pressure
d. Osmosis and Osmotic Pressure
Osmosis
- movement of a solvent (as water) through a semipermeable membrane (as of a living cell) into a solution of higher solute concentration that tends to equalize the concentrations of solute on the two sides of the membrane
Osmotic Pressure
- the pressure produced by or associated with osmosis and dependent on molar concentration and absolute temperature: as
a : the maximum pressure that develops in a solution separated from a solvent by a membrane permeable only to the solvent
b : the pressure that must be applied to a solution to just prevent osmosis
Reply
Medina, Mark Joseph D.
2/28/2012 05:41:40 pm
a. Name: Medina, Mark Joseph D.
b. Section: 2
c. Website used
for Osmosis
http://edtech.clas.pdx.edu/osmosis_tutorial/
for Osmotic Pressure
http://web.fccj.org/~ethall/2046/ch11/op.htm
d. Osmosis and Osmotic Pressure
Osmosis - Osmosis is the movement of water across a selectively permeable membrane.
Osmotic Pressure - Osmotic pressure is force per area that prevents water from passing through membrane!
Osmosis is the net movement of a solvent across a semipermeable membrane from a region of high solvent potential to an area of low solvent potential down a concentration gradient. It is a physical process in which a solvent moves, without input of energy, across a semipermeable membrane (permeable to the solvent, but not the solute) separating two solutions of different concentrations.[1] Osmosis releases energy, and can be made to do work, as when a growing tree-root splits a stone.
Osmotic pressure is the main cause of support in many plants. The osmotic entry of water raises the turgor pressure exerted against the cell wall, until it equals the osmotic pressure, creating a steady state. Osmotic pressure is a colligative property, meaning that the property depends on the concentration of the solute but not on its identity.
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john adrian rocero
3/5/2012 12:14:59 pm
ma'am ok na po ba ito?
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Base, Quinn Veryl R.
2/28/2012 07:03:11 pm
a. Name: Base, Quinn Veryl R.
b. Section: 4C
c. Website Used
http://www.urbandictionary.com/define.php?term=osmosis
http://www.wordsmyth.net/?level=3&ent=osmotic+pressure
d. Your answer
OSMOSIS:
The simple diffusion of water (H20) into the plasma membrane. The diffusion of water is determined by the concentration of dissolved substances in the surrounding enviroment.
Osmosis is integral to life. A change in the surrounding enviroment could disrupte the homeostasis of a cell.
The transfer of something from an area with a high concentration of said thing to an area with a low concetration through a permeable membrane. A study method popular with many pupils and students, usually achieved by falling asleep with ones head directly atop of ones study materials.
OSMOTIC PRESSURE
the pressure created by a solvent in passing through a semipermeable membrane.
Reply
Condez, Vince Joshua M.
2/28/2012 08:44:16 pm
a. Condez, Vince Joshua M.
b. 4C
c. http://urila.tripod.com/
d. What is osmosis? It is the phenomenon of water flow through a semi-permeable membrane that blocks the transport of salts or other solutes through it. Osmosis is a fundamental effect in all biological systems. It is applied to water purification and desalination, waste material treatment, and many other chemical and biochemical laboratory and industrial processes.
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Curitana, Xyron Vonn M. -4c
2/28/2012 09:28:37 pm
a.name. CURITANA, Xyron Vonn M.
b.4c
cwww.daviddarling.info/encyclopedia/O/osmosis.html
d.Osmosis-The diffusion of a solvent, such as water, through a semipermeable membrane that separates two solutions of different concentration, the movement being from the more dilute to the more concentrated solution, owing to the thermodynamic tendency to equalize the concentrations. The liquid flow may be opposed by applying pressure to the more concentrated solution: the pressure required to reduce the flow to zero from a pure solvent to a given solution is known as the osmotic pressure of the solution.
Osmosis was studied by Thomas Graham, who coined the term (1858); in 1886 Van't Hoff showed that, for dilute solutions (obeying Henry's law), the osmotic pressure varies with temperature and concentration as if the solute were a gas occupying the volume of the solution. This enables molecular weights to be calculated from osmotic pressure measurements, and degrees of ionic dissociation to be estimated. Osmosis is important in dialysis and in water transport in living tissues.
The principle of osmosis. The osmotic pressure difference across a semipermeable membrane separating two solutions of different concentrations causes transport of the solvent through the membrane tending to equalize the concentrations of the two solutions. The process continues until an equilibrium state is achieved, either equal concentrations, or, in this case, balance between the osmotic pressure difference and the hydrostatic pressure excess of the solution in the inverted thistle funnel. The hydrostatic pressure difference thus provides a measure of the osmotic pressure difference.
Reply
Eñola, Ignacio Miguel III E.
2/28/2012 09:38:14 pm
a. Name: Eñola, Ignacio Miguel III E.
b. Section: 3B
c. Website used:
http://www.businessdictionary.com/definition/osmosis.html
http://www.yourdictionary.com/osmotic-pressure
d. Your Answer:
Osmosis
- Passage of a solvent (such as water) from a lower-concentration solution to a higher-concentration solution, through a semi-permeable membrane (that allows the solvent to pass but not what is dissolved in it) separating the two solutions. The flow of solvent stops when both solutions become equal in concentration. In nature, osmosis is an essential process by means of which nutrients are delivered to the cells.
Osmotic Pressure
- Osmotic pressure is the force caused by a solution passing through a semipermeable surface by osmosis, which is equal to the force required to resist the solution from passing back through the surface.
An example of osmotic pressure is the process to filter water.
Reply
FERRER KRISTIAN ROY B.
2/28/2012 09:53:19 pm
a.name: Ferrer, Kristian Roy B.
b.section: 12b
c.website/book: merriam-webster's dictionary and thesaurous (dictionary) / www. biology-online.org
d.answer: osmosis: n :movement of a solvent through a semipermeable membrane into a solution of higher concentration that trends to equalize the concentrations of the solutions on either side of the membrane -- osmotic adj.
cosmotic pressure: noun a hyrostatic pressure caused by a difference in the amounts of solute between solutions that are separated by a semipermeable membrane.
Reply
ANGELO R. CARREON
2/28/2012 09:54:40 pm
Name: ANGELO R. CARREON
Section: 12B
Book: General Chemistry (The Essential Concepts) Fifth Edition
Author: RAYMOND CHANG
=OSMOSIS=
The net movement of solvent molecules through a semipermeable membrane from a pure solvent or from a dilute solution to a more concentrated solution.
=OSMOTIC PRESSURE=
Is the pressure required to stop osmosis.
Reply
ferrer kristian roy b.
2/28/2012 09:55:02 pm
ma'am ** osmotic pressure
Reply
Yu, John Richard F.
2/28/2012 09:57:46 pm
A. Yu, John Richard F.
B. 3B
C. Website used:
http://www.blobs.org/science/article.php?article=20
C. Your Answer:
Osmosis:
osmosis is where the concept of diffusion gets even more confusing. Rather than the simple process of one chemical evening itself out, osmosis relates to a situation where something is dissolved in something else.
Osmotic pressure:
Osmotic pressure is considered to be the pressure across a semi-permeable membrane caused by a solution.
A.) Name: Estepa, Angelo T.
B.) Section: 3B
C.) Websites used: "http://www.purchon.com/biology/osmosis.htm#definition"
"http://rkt.chem.ox.ac.uk/lectures/liqsolns/polymer_solutions.html"
D.) Answers
"Osmosis" is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.
The definition contains three important statements:
1.) Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.
2.) Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.
3.) Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.
"Osmotic Pressure"
Osmotic pressure is the most useful of the colligative properties. It is widely used for the determination of molecular weights of large molecules such as polymers and proteins. The principle is shown in the diagram below. The pure solvent and solution are separated by a membrane permeable only to the small solvent molecules (the polymer cannot pass through). The chemical potential of the solvent is lower in the solution and it will therefore tend to pass through the membrane from pure solvent to solution. This process can be opposed by applying a pressure (additional to atmospheric and called the osmotic pressure) to the solution.
A. Estrellado, Dia Angelique H.
B. 4C
C. http://www.vivo.colostate.edu/hbooks/cmb/cells/pmemb/osmosis.html
D. Osmosis is the net movement of water across a selectively permeable membrane driven by a difference in solute concentrations on the two sides of the membrane. osmosis is that water flows from the solution with the lower solute concentration into the solution with higher solute concentration.
D. What is OSMOSIS?
Osmosis is the net movement of water through a selective permeable membrane from a region of low solute potential to a region of high solute potential (or equivalently, from a region of high solvent potential to a region of low solvent potential). The partially permeable membrane must be permeable to the solvent, but not to the solute, resulting in a pressure gradient across the membrane.
OSMOTIC PRESSURE
The pressure required to prevent the passage of water through a semi-permeable membrane from a region of low concentration of solutes to one of higher concentration, by osmosis.
Reply
Baligasa Rondel B
2/28/2012 10:58:22 pm
Baligasa Rondel B
3B
website: http://chemistry.about.com/od/chemistryglossary/g/osmosisdef.htm
http://chemistry.about.com/b/2010/11/09/osmotic-pressure-and-tonicity.htm
Osmosis
Process where solvent molecules move through a semipermeable membrane from a dilute solution into a more concentrated solution (which becomes more dilute).
Osmotic pressure
Osmotic pressure is the pressure of a solution against a semipermeable membrane to prevent water from flowing inward across the membrane. Tonicity is the measure of this pressure. If the concentration of solutes on both sides of the membrane is equal, then there is no tendency for water to move across the membrane and no osmotic pressure.
Reply
VILLANUEVA
2/28/2012 11:23:50 pm
A.)name VILLANUEVA MARK JOSEPH L.
B.)section 3-B
C.)website http://science.jrank.org/pages/4931/Osmosis-Cellular-Osmosis-in-plant-cells.html
D.)answer
Plant cells are surrounded by rigid cellulose walls, (unlike animal cells), but plant cells still take in water by osmosis when placed in pure water. However, plant cells do not burst because their cellulose cell walls limit how much water can move in. The cell walls exert pressure, called turgor pressure, as the cells take up water. Turgor pressure is analogous to the air pressure of an inflated tire. These physical forces can be described by a simple mathematical equation: ψ = P + π, where ψ ("Psi") is the water potential, a measure of the overall tendency of water to move into a cell; P is the pressure potential, a measure of the turgor pressure exerted by the cell walls; and π is the osmotic potential (see above). Water always moves from regions of higher ψ to areas of lower ψ. Animal cells do not have cellulose cell walls, so P = 0 and ψ = π for these cells.
The significance of osmosis to plant function is best appreciated by describing its role in the regulation of guard cells. Guard cells are specialized cells scattered across the surface of plant leaves. Each pair of guard cells surround a special pore, termed a stoma (plural stomata), and control its opening. Guard cells have a special arrangement of microfibrils in their walls, so that when the guard cells swell the stomata open. When the stomata of a plant leaf are open, this increases photosynthetic gas exchange and movement of water out of the plant by transpiration.
Reply
Rarang Louie c.
2/28/2012 11:28:12 pm
A. NAME: Rarang Louie C.
B.3B
C.WEBSITE:http://www.thistlebond.info/products/marine/whatis.htm
D.ANSWER:Osmosis is a problem encountered by the majority of boat owners and is caused by the degeneration of the GRP hull over a period of time.
The hull of your boat is made out of Polyester Resin and Glass Fibres. Once set this forms a tough and durable structure, however if a fault has occurred this may allow water to ingress into the laminate
Once the water has been soaked into the laminate, the gelcoat will start to blister. The Gelcoat will start to break away from the GRP it is meant to protect and will soak up any water penetrating through the coating.
There are no hard and fast rules about when this may occur, all depends on the quality of the Polyester Resin and Glass Fibres used, how long your boat has been moored in the water and the temperatures it has endured.
osmotic pressure' is a pressure difference the is caused by differences in concentration of a solute. Imagine an open container with a semipermeable membrane, one side has pure water and the other has (for example) saline. The osmotic pressure jump across the membrane will drive water through the membrane, until the change in hydrostatic pressure (the movement of water will change the volume of both sides) compensates.
'osmolarity' is a quantitative measure of the concentration of solute. Blood, for example, is about 330 mOsm.
Reply
Danica Manalang
2/29/2012 12:04:57 am
Name: Danica E. Manalang
Section:12B
Website:http://www.physicsforums.com/showthread.php?t=343781
Answer:osmotic pressure' is a pressure difference the is caused by differences in concentration of a solute. Imagine an open container with a semipermeable membrane, one side has pure water and the other has (for example) saline. The osmotic pressure jump across the membrane will drive water through the membrane, until the change in hydrostatic pressure (the movement of water will change the volume of both sides) compensates.
'osmolarity' is a quantitative measure of the concentration of solute. Blood, for example, is about 330 mOsm.
Name: Gadingan, Ralph
Section: 3B
Websites used: http://www.macmillandictionary.com/dictionary/american/osmosis#osmosis_3, http://www.vocabulary.com/definition/osmotic_pressure#word=osmotic%20pressure
Osmosis- The process by which a liquid that contains a small amount of dissolved substances slowly passes through a membrane (=thin layer of something) into a liquid that contains a large amount of dissolved substances.
Osmotic Presssure- The pressure exerted by a solution necessary to prevent osmosis into that solution when it is separated from the pure solvent by a semipermeable membrane.
Reply
Dabuyan, Julian S.
2/29/2012 07:07:50 pm
Section 2
sites used
http://chemistry.about.com/od/chemistryglossary/g/osmosisdef.htm
http://chemistry.about.com/od/chemistryglossary/a/osmoticpressure.htm
Answers:
Osmosis - Process where solvent molecules move through a semipermeable membrane from a dilute solution into a more concentrated solution (which becomes more dilute).
Osmotic Pressure - name given to the hydrostatic pressure resulting from a concentration gradient across two sides of a surface, such as across a semipermeable membrane.
Reply
Dabuya, Julian S.
2/29/2012 07:16:08 pm
Section 2
1. Osmosis. (biology, chemistry) diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal.
From: http://www.lexic.us/definition-of/osmosis
2. OSMOTIC PRESSURE (noun) The noun OSMOTIC PRESSURE has 1 sense: 1. (physical chemistry) the pressure exerted by a solution necessary to prevent osmosis into that solution when it is separated from the pure solvent by a semipermeable membrane.
From: http://www.experts123.com/q/what-does-osmotic-pressure-mean.html
Reply
Estacio, Justine Jerrimie P.
2/29/2012 10:17:19 pm
a. Estacio, Justine Jerrimie P.
b. 3B
c.http://www.vivo.colostate.edu/hbooks/cmb/cells/pmemb/osmosis.html
- Osmosis is the net movement of water across a selectively permeable membrane driven by a difference in solute concentrations on the two sides of the membrane.
d2)What is Osmatic Pressure
- Osmotic pressure is the hydrostatic pressure produced by a solution in a space divided by a semipermeable membrane due to a differential in the concentrations of solute.
Reply
balois carlo c
3/1/2012 06:46:19 am
A.what is Osmosis
B.http://www.wisegeek.com/what-is-osmosis.htm
C. Balois, Carlo C.
D. Section 2
A.Osmosis is a process in which a fluid passes through a semipermeable membrane, moving from an area in which a solute such as salt is present in low concentrations to an area in which the solute is present in high concentrations. The end result of
osmosis, barring external factors, will be equal amounts of fluid on either side of the barrier, creating a state which is known as “isotonic.” The fluid most commonly used in demonstrations of osmosis is water, and osmosis with a wide variety of fluid solutions is key for every living organism on Earth, from humans to plants.
Reply
Balois Carlo C
3/1/2012 03:10:56 pm
Name: Carlo Balois
Sec: 2
Website:
Answer
http://answers.yahoo.com/question/index?qid=20070714021227AAXh83A
What is osmotic pressure?
According to dictionaries, osmotic pressure is the pressure exerted by a dissolved substance in virtue to its molecular motion. But does the 'dissolved substance' mean the solute or the solvent? Does the pressure refer to the pressure exerted by the solute or the solvent molecules?
http://au.answers.yahoo.com/question/index?qid=20071211013725AAorOvE
osmosis is the movement of water molecules from an area of high water concentration to an area of low water concentration, through a partially permiable membrane. im not sure how it helps in real life though... its used in plants a lot
Reply
mark angelo velasco
3/1/2012 04:03:26 pm
mark angelo v. velasco
section 2
http://www.purchon.com/biology/osmosis.htm
First the definition of osmosis:
Semi-permeable membranes are very thin layers of material (cell membranes are semi-permeable) which allow some things to pass through them but prevent other things from passing through.
Cell membranes will allow small molecules like Oxygen, water, Carbon Dioxide, Ammonia, Glucose, amino-acids, etc. to pass through. Cell membranes will not allow larger molecules like Sucrose, Starch, protein, etc. to pass through.
A region of high concentration of water is either a very dilute solution of something like sucrose or pure water. In each case there is a lot of water: there is a high concentration of water.
Some teachers use the definition which starts "Osmosis is the passage of water from a dilute solution to a......" this means exactly the same as the definition I have given.
A region of low concentration of water is a concentrated solution of something like sucrose. In this case there is much less water.
So you could use the definition "Osmosis is the passage of water from a dilute solution through a semi-permeable membrane to a more concentrated solution.
Osmotic pressure arises when two solutions of different concentrations, or a pure solvent and a solution, are separated by a semipermeable membrane. Molecules such as solvent molecules that can pass through the membrane will migrate from the side of higher concentration to the side of lower concentration in a process known as osmosis.
The pressure required to stop osmosis is called the osmotic pressure.
In dilute solutions, osmotic pressure (Π) is directly proportional to the molarity of the solution and its temperature in Kelvin.
van't Hoff Equation: Π = MRT
Π = osmotic pressure
M = molarity = moles ÷ volume(L)
R = ideal gas constant
T = temperature (K)
Solvent can be removed from a solution using a pressure greater than the osmotic pressure. This is known as reverse osmosis.
Reply
Kathleen Faye R. Maranan
3/1/2012 08:29:02 pm
Sec 2.
Osmosis is the movement of solvent
Solvent
A solvent is a liquid, solid, or gas that dissolves another solid, liquid, or gaseous solute, resulting in a solution that is soluble in a certain volume of solvent at a specified temperature...
molecules through a selectively permeable
Semipermeable membrane
A semipermeable membrane, also termed a selectively permeable membrane, a partially permeable membrane or a differentially permeable membrane, is a membrane that will allow certain molecules or ions to pass through it by diffusion and occasionally specialized "facilitated diffusion".The rate of...
membrane into a region of higher solute
Solute
Solute may refer to:* Solute, UMIK or UBOOK desolving in a substance,forming INT/INTY* Solute , a group of Paleozoic echinoderms...
concentration, aiming to equalize the solute concentrations on the two sides. It may also be used to describe a physical process in which any solvent moves, without input of energy, across a semipermeable membrane (permeable to the solvent
Solvent
A solvent is a liquid, solid, or gas that dissolves another solid, liquid, or gaseous solute, resulting in a solution that is soluble in a certain volume of solvent at a specified temperature...
, but not the solute) separating two solutions of different concentrations. Although osmosis does not require input of energy, it does use kinetic energy and can be made to do work,.
http://www.absoluteastronomy.com/topics/Osmosis
osmotic pressure
American Heritage® Dictionary of the English Language, Fourth Edition
1. n. The pressure exerted by the flow of water through a semipermeable membrane separating two solutions with different concentrations of solute.
Wiktionary
1. n. The hydrostatic pressure exerted by a solution across a semipermeable membrane from a pure solvent; the pressure needed to counteract osmosis
GNU Webster's 1913
1. n. The pressure which a solution of a substance in a liquid exerts on a semipermeable membrane, through which the solvent can diffuse but the dissolved substance (the solute) cannot diffuse, when separated across the membrane from the pure solvent. In general, the osmotic pressure will depend almost proportionally up to certain concentrations upon the molal concentration of the solute.
WordNet 3.0
1. n. (physical chemistry) the pressure exerted by a solution necessary to prevent osmosis into that solution when it is separated from the pure solvent by a semipermeable membrane
http://www.wordnik.com/words/osmotic%20pressure
Reply
Jaynos, Joshua Allan
3/1/2012 08:59:24 pm
a) Jaynos, Joshua Allan
b) Sec 2
c) http://www.ozoneservices.com/glossary/o/osmosis.htm
http://tmp.kiwix.org:4201/A/Osmotic_pressure.html
d) Osmosis
The natural tendency for water to spontaneously pass through a semipermeable membrane separating two solutions of different concentrations (strengths). The water will naturally pass from the weaker (less concentrated) solution containing fewer particles of dissolved substance to the stronger (more concentrated) solution containing more particles of a dissolved substance. The natural osmosis causes the stronger solution to become more diluted, and tends to equalize the strength of the solutions on both sides of the membrane.
Osmotic pressure
Osmotic pressure is the hydrostatic pressure produced by a difference in concentration between solutions on the two sides of a surface such as a semipermeable membrane.
Reply
MANIMTIM, LLOYD RENZOL J.
3/1/2012 09:07:06 pm
a.) Manimtim, Lloyd Renzol J.
b.) section 2
c.)http://www.bookrags.com/research/osmotic-pressure-woc/
http://www.bookrags.com/research/osmosis-wob/
d.)
OSMOTIC PRESSURE
-Osmotic pressure is a measure of the extra pressure that has to be exerted to counteract osmosis. The osmotic pressure of a solution is the force that has to be exerted to halt osmosis. If a U-shaped glass tube were divided in two by a semipermeable membrane and filled with two solutions the osmotic pressure could be shown. If a solution were on the left-hand side of the membrane and pure solvent were on the right-hand side then movement would occur from the right to the left.
This movement could be halted by applying pressure to the left hand arm (the one containing the solution). The pressure exerted is the osmotic pressure. The osmotic pressure obeys a law similar in form to that of the ideal gas law, PiV = nRT, where Pi is the osmotic pressure, V is the volume of the solution, n is the number of moles of solute, R is the ideal gas constant, and T is the absolute temperature. Since the number of moles of solute divided by the volume of the solution is the molarity (M) of the solution this equation can be rewritten as Pi = MRT. If two solutions are separated by a semipermeable membrane and they have the same osmotic pressure they are said to be isotonic. If one solution has a lower osmotic pressure it is said to hypotonic to the more concentrated solution, which is termed the hypertonic solution.
OSMOSIS
-Osmosis
Osmosis is a process by which a solvent (the liquid that dissolves another substance) in solution passes through a barrier. The solvent may pass through the barrier, but the solute (the substance dissolved in the solvent) either does not go through it, or passes through much more slowly than the solvent. The solvent will pass through the barrier until the concentration of solvent is the same on both sides of the barrier. The barrier is a membrane that is either permeable, allowing solvent and solute molecules to pass through, or semipermeable, allowing only solvent molecules to pass through. The pressure of the water passing through the membrane is called osmotic pressure.
Osmosis - diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal.
Osmotic Pressure - The pressure required to prevent the passage of solvent through a semipermeable membrane that separates a pure solvent from a solution of the solvent and solute or that separates different concentrations of a solution. It is proportional to the osmolality of the solution.
a.Jonson Solis
b.12B
c.1.http://www.vivo.colostate.edu/hbooks/cmb/cells/pmemb/osmosis.html
2.http://chemed.chem.wisc.edu/chempaths/GenChem-Textbook/Osmotic-Pressure-854.html
Osmosis is the net movement of water across a selectively permeable membrane driven by a difference in solute concentrations on the two sides of the membrane. A selectively permiable membrane is one that allows unrestricted passage of water, but not solute molecules or ions.The key to remember about osmosis is that water flows from the solution with the lower solute concentration into the solution with higher solute concentration. This means that water flows in response to differences in molarity across a membrane. The size of the solute particles does not influence osmosis. Equilibrium is reached once sufficient water has moved to equalize the solute concentration on both sides of the membrane, and at that point, net flow of water ceases.
osmotic pressure is not a pressure which the solution itself exerts but is rather the pressure which must be applied to the solution (but not the solvent) from outside in order to just prevent osmosis from occurring. A simple method for measuring the osmotic pressure is shown in Fig. 2. The wider end of a funnel-shaped tube is covered with a membrane. The tube is filled with solution and placed in a container of the solvent. The height of the solution above the solvent increases until a maximum value is reached. The osmotic pressure is then the pressure exerted by the column of a solution of height h:
Π = ρgh
where ρ is the density of the solution and g is the gravitational acceleration. Experimentally the osmotic pressure is found to obey a law similar in form to the ideal gas law and hence easy to remember:
ΠV = nRT (1)
MAM ok po ba to??
Reply
Derada, Carlo - 4C
3/2/2012 10:30:25 am
a. Derada, Jullian Carlo D.
b. 4C
c. http://cdsweb.cern.ch/record/615266
d. Although osmosis is a familiar phenomenon, and of pivotal importance in natural systems, it is seldom explained how it might work on the molecular level (if treated at all in physics text books). The standard treatment of osmosis in thermodynamics employs the concept of the chemical potential and does not give any clues how the process "really" works. On the other hand one may also encounter conflicting qualitative and molecular explanations of osmosis. We use the case of osmosis in the present paper to elucidate different ways to "explain" and "understand" physical phenomena. The role of qualitative understanding of physical phenomena is emphasized. However, as the case of osmosis demonstrates, there may be a big gap between the abstract macroscopic theory and molecular conceptions of the mechanism
- Osmotic Pressure : The hydrostatic pressure exerted by a solution across a semipermeable membrane from a pure solvent; the pressure needed to counteract osmosis
http://en.wiktionary.org/wiki/osmotic_pressure
Reply
Ambrocio, Kerrwin Jio A. (4C)
3/2/2012 10:31:45 am
a. Ambrocio, Kerrwin Jio A.
b. 4C
c. http://plantphys.info/plant_physiology/osmosis.shtml
http://www.sccs.swarthmore.edu/users/08/ajb/tmve/wiki100k/docs/Osmotic_pressure.html
d. Osmosis is the passive movement of water across a membrane
The actual movement of water through a cell membrane is the result of two processes: diffusion and bulk flow. As you recall a membrane is the thickness of a phospholipid bilayer. The size of a water molecule permits it to pass through the bilayer. This would be largely a diffusion movement subject to Fick's Law. The membrane also posesses integral proteins; the one involved with water transport is called an aquaporin. The aquaporin protein serves as a water-filled pipe across the membrane.
Osmotic Pressure
Osmotic pressure is the pressure applied by a solution to prevent the inward flow of water across a semipermeable membrane.
The phenomenon of osmotic pressure arises from the tendency of a pure solvent to move through a semi-permeable membrane and into a solution containing a solute to which the membrane is impermeable. This process is of vital importance in biology as the cell's membrane is selective towards many of the solutes found in living organisms.
Reply
Co, Samuel Vincent T. (4C)
3/2/2012 03:23:54 pm
a. Co, Samuel Vincent T.
b. 4C
c. http://www.biology-online.org/dictionary/Osmosis
http://www.biology-online.org/dictionary/Osmotic_pressure
d. Osmosis - diffusion of a solvent (usually water molecules) through a semipermeable membrane from an area of low solute concentration to an area of high solute concentration.
Osmotic pressure - A hydrostatic pressure caused by a difference in the amounts of solutes between solutions that are separated by a semi-permeable membrane.
Reply
Galamiton, Edrizzia Eunice Hazel G.
3/2/2012 06:18:09 pm
a. Galamiton, Edrizzia Eunice Hazel G.
b. 2
c. Osmosis Reference:
http://www.yourdictionary.com/osmosis
Osmotic Pressure Reference:
http://science.yourdictionary.com/osmosis
d.
OSMOSIS:
Osmosis is the distribution of liquid with a low concentration flowing through a membrane into an area with a higher concentration resulting in the concentrations being equal on both sides.
OSMOTIC PRESSURE:
The movement of a solvent through a membrane separating two solutions of different concentrations. The solvent from the side of weaker concentration usually moves to the side of the stronger concentration, diluting it, until the concentrations of the solutions are equal on both sides of the membrane.
♦ The pressure exerted by the molecules of the solvent on the membrane they pass through is called osmotic pressure. Osmotic pressure is the energy driving osmosis and is important for living organisms because it allows water and nutrients dissolved in water to pass through cell membranes.
Reply
Christian Karl T. Borela
3/2/2012 09:58:53 pm
a. Name: Christian Karl T. Borela
b. Section: 2
c. Website Used:
1ST ANSWER url: http://science.howstuffworks.com/reverse-osmosis1.htm
2ND ANSWER url: http://www.thefreedictionary.com/osmotic+pressure
d. Your answer
What is osmosis?
url: http://science.howstuffworks.com/reverse-osmosis1.htm
Answer:
Osmosis is the passage or diffusion of water or other solvents through a semipermeable membrane that blocks the passage of dissolved solutes – 1st paragraph
What is Osmotic Pressure?
url: http://www.thefreedictionary.com/osmotic+pressure
Answer:
Osmotic pressure is (physical chemistry) the pressure exerted by a solution necessary to prevent osmosis into that solution when it is separated from the pure solvent by a semipermeable membrane
Reply
Christian Karl T. Borela
3/2/2012 10:11:23 pm
a. Name: Christian Karl T. Borela
b. Section: 2
c. Website Used:
1ST ANSWER url: http://science.howstuffworks.com/reverse-osmosis1.htm
2ND ANSWER url: http://www.enotes.com/topic/Osmotic_pressure
d. Your answer
What is osmosis?
url: http://science.howstuffworks.com/reverse-osmosis1.htm
Answer:
Osmosis is the passage or diffusion of water or other solvents through a semipermeable membrane that blocks the passage of dissolved solutes – 1st paragraph
d. What is Osmotic pressure?
url: http://www.enotes.com/topic/Osmotic_pressure
Osmotic pressure is the pressure which needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane.
The phenomenon of osmotic pressure arises from the tendency of a pure solvent to move through a semi-permeable membrane and into a solution containing a solute to which the membrane isimpermeable. This process is of vital importance in biology as the cell's membrane is selective towards many of the solutes found in living organisms.
Reply
Santos, Aeron Paul C. Sec2
3/2/2012 11:23:47 pm
a. Name
- Santos, Aeron Paul C.
b. Section
-2
c. Website Used
-http://www.expertglossary.com/food-biotechnology/definition/osmosis
-http://www.collinsdictionary.com/dictionary/english/osmotic-pressure
d. Your answer
-Osmosis: Diffusion of water across a semi-permeable membrane from zones of low solute concentration to zones of higher solute concentration.
-Osmotic Pressure: the pressure necessary to prevent osmosis into a given solution when the solution is separated from the pure solvent by a semipermeable membrane
Reply
Santos
3/2/2012 11:27:34 pm
Ma'am I used Ctrl+F in the page and searched for the websites i used and I didn't find any similar answer ^.^
the others may use that as well to know if the website is still usable (just sharing, cause sharing is caring)
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Fredniel Trinidad
3/3/2012 12:07:18 am
a. Name
- Trinidad Fredniel.
b. Section
-2
c. Website Used
-http://www.ncbi.nlm.nih.gov/books/NBK21739/
d. Your answer
osmosis — the movement of water from a region of lower solute concentration to a region of higher solute concentration.
-osmotic pressure
the force that a dissolved substance exerts on a semipermeable membrane, through which it cannot penetrate, when separated by it from pure solvent.
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jose tacata lll
3/3/2012 10:19:44 am
a. Name
- jose tacata lll.
b. Section
-2
c. Website Used
-http://www.newworldencyclopedia.org/entry/Osmosis
d. Your answer
-s the movement of water molecules across a semi-permeable membrane from a region of low solute potential to an area of high solute potential (or equivalently, from a region of high solvent potential to a region of low solvent potential). The partially permeable membrane must be permeable to the solvent (the solution), but not to the solute (the substance dissolved in the solution), resulting in a pressure gradient across the membrane.
Osmosis is an important topic in biology because it provides the primary means by which water is transported into and out of cells. Human creativity has also learned to take advantage of principles related to osmosis for such useful processes as desalination, water purification, water treatment, and food processing.
Water molecules travel through the cell membrane/tonoplast/protoplast in two ways, either by diffusing across the phospholipid bilayer directly, or via aquaporins (small transmembrane proteins similar to those in facilitated diffusion and in creating ion channels).
Osmosis is a natural phenomenon. However, it can be artificially opposed by increasing the pressure in the section of high solute concentration with respect to that in the low solute concentration. The osmotic pressure is equal to the force per unit area that is necessary to prevent passage of solvent into the region of greater solvent concentration. The osmotic pressure depends on the concentration of the solvent, not its identity.
-Osmotic pressure is the hydrostatic pressure produced by a solution in a space divided by a semipermeable membrane due to a differential in the concentrations of solute.
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Naraja, Jan Michael C.
3/3/2012 02:39:56 pm
a) jan michael c. naraja
b) sec. 2
c) http://www.mansfield.ohio-state.edu/~sabedon/biol1053.htm
d) Osmosis- In the absence of any opposing force, water tends to flow across semipermeable membranes (membranes which lets water but not solute through).
Osmotic pressure- with pure water on one side of a semipermeable membrane, a solution n the other side is said to have an osmotic pressure equal to the pressure that must be applied to the solution in order to prevent a net influx of water(i.e., dilution).
answer:
Osmosis is the net movement of water across a selectively permeable membrane driven by a difference in solute concentrations on the two sides of the membrane. A selectively permiable membrane is one that allows unrestricted passage of water, but not solute molecules or ions.
answer:
Osmotic pressure is the hydrostatic pressure produced by a solution in a space divided by a semipermeable membrane due to a differential in the concentrations of solute.
Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.
The definition contains three important statements:
Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.
Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.
Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.
It does not matter too much which order you put these statements in. Nor does it matter if you write the definition as one sentence or three sentences. All that matters in your exam is that you make all three points when you explain what osmosis is.
What is osmotic pressure?
Osmotic pressure is the force caused by a solution passing through a semipermeable surface by osmosis, which is equal to the force required to resist the solution from passing back through the surface. (noun)
An example of osmotic pressure is the process to filter water.
claricia, marjo rojam neil m.
2
http://dictionary.reference.com/browse/osmosis
http://dictionary.reference.com/browse/osmotic+pressure
1.OSMOSIS
- the diffusion of fluids through membranes or porous partitions. Compare endosmosis, exosmosis.
2. OSMOTIC PRESSURE
- the force that a dissolved substance exerts on a semipermeable membrane, through which it cannot penetrate, when separated by it from pure solvent.
Osmotic pressure is the pressure which needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane.[1]
The phenomenon of osmotic pressure arises from the tendency of a pure solvent to move through a semi-permeable membrane and into a solution containing a solute to which the membrane is impermeable. This process is of vital importance in biology as the cell's membrane is selective towards many of the solutes found in living organisms.
In order to visualize this effect, imagine a U-shaped clear tube with equal amounts of water on each side, separated by a membrane at its base that is impermeable to sugar molecules (made from dialysis tubing). Sugar has been added to the water on one side. The height of the water on each side will change proportional to the pressure of the solutions.
Osmotic pressure causes the height of the water in the compartment containing the sugar to rise, due to movement of the pure water from the compartment without sugar into the compartment containing the sugar water. This process will stop once the pressures of the water and sugar water toward both sides of the membrane are equated.
What is osmosis?
Diffusion of a solvent (usually water molecules) through a semipermeable membrane from an area of low solute concentration to an area of high solute concentration.
What is osmotic pressure?
The pressure required to stop osmosis through a semipermeable membrane between a solution and pure solvent. It is proportional to the osmolality of the solution. Osmotic shock is a sudden change in the osmotic pressure to which a cell is subjected, usually in order to cause it to lyse and lose its contents
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Paolo Joy L. Rabar
3/4/2012 09:10:22 pm
a. Rabara, Paolo Joy L.
b. 2
c. http://www.yourdictionary.com/osmotic-pressure
d. Osmotic pressure is the force caused by a solution passing through a semipermeable surface by osmosis, which is equal to the force required to resist the solution from passing back through the surface.
Osmosis is the movement of molecules down a concentration gradient and at the same time across a membrane. Cell membranes do not allow all molecules to cross them. They are said to be "selectively" or "differentially" permeable. Only certain molecules can cross the membrane into or out of a cell. For example, water can cross the membrane while sodium and chlorine ions (dissolved salt) cannot. If there is a concentration gradient across the membrane (if there is more salt and less water on one side than on the other), water will move across the membrane down the concentration gradient while the salt cannot. If there is more salt and less water inside a cell than outside, water will flow into the cell from the surrounding environment. This process is called osmosis.
Osmosis is actually a diffusion that takes place across a semi permeable membrane. For a clearer explanation, osmosis is the movement of water across a semi permeable membrane from an area of low solute concentration to an area of high solute concentration. Similar to diffusion, osmosis is a passive process. The result of osmosis is a separated two solutions of different concentrations.
The osmotic pressure of a solution at a particular temperature may be defined as the excess hydrostatic pressure that builds up when the solution is separated from the solvent by a semi-permeable membrane. It is denoted by p.
or
Osmotic pressure may be defined as the excess pressure which must be applied to a solution in order to prevent flow of solvent into the solution through the semi-permeable membrane.
or
Osmotic pressure is the excess pressure which must be applied to a given solution in order to increase its vapour pressure until it becomes equal to that of the solution.
Osmosis is a process in which a fluid passes through a semipermeable membrane, moving from an area in which a solute such as salt is present in low concentrations to an area in which the solute is present in high concentrations. The end result of osmosis, barring external factors, will be equal amounts of fluid on either side of the barrier, creating a state which is known as “isotonic.” The fluid most commonly used in demonstrations of osmosis is water, and osmosis with a wide variety of fluid solutions is key for every living organism on Earth, from humans to plants.
There are some key terms related to osmosis which may be helpful to know when thinking about how osmosis works. The fluid which passes through the membrane is known as a solvent, while the dissolved substance in the fluid is a solute. Together, the solvent and dissolved solute make up a solution. When a solution has low levels of a solute, it is considered to be hypotonic, while solutions with high solute levels are known as hypertonic.
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Ian Jonathan T. Francisco
3/7/2012 06:50:11 pm
a.) Ian Jonathan T. Francisco
b.) 12B
c.) http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/ospcal.html
http://www.youtube.com/watch?v=SAVdXrpSyhw
d.) Osmosis is the movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration, aiming to equalize the solute concentrations on the two sides.It may also be used to describe a physical process in which any solvent moves, without input of energy, across a semipermeable membrane (permeable to the solvent, but not the solute) separating two solutions of different concentrations.Although osmosis does not require input of energy, it does use kinetic energy and can be made to do work.
The osmotic pressure of a dilute solution is found to obey a relationship of the same form as the ideal gas law:
In chemistry texts, it is usually expressed in terms of the molarity of the solution and given the symbol π.
In these relationships, R = 8.3145 J/k mol is the normal gas constant and R'= 0.0821 L atm/K mol is the gas constant expressed in terms of liters and atmospheres.
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Ian Jonathan T. Francisco
3/7/2012 06:52:15 pm
Mam Facundo..
Nkita nyo na po ba ung sagot ko? nakalagay po kc "This comment is currently being held for moderation awaiting approval."
salamat po
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Martin B. Gomez
3/9/2012 10:45:28 am
a. Name: Martin B. Gomez
b. Section: 12B
c. Book Used: VOLUME 21, THE ENCYCLOPEDIA AMERICANA INTERNATIONAL EDITION, GROULIER INCORPORATED
d. Your answer: What is Osmosis? oz-mo'sis, the apparantly spontaneous passage of a liquid substance through a semipermeable membrane.
What is Osmotic Pressure? The hydrostatic pressure difference that develops when a dilute solution is separated from a concentrated solution of a solvent by a semipermeable membrane is called the osmotic pressure. This pressure can be measured either after the osmosis process has occurred or before.
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santiago carlo c.
3/11/2012 09:09:22 pm
A. Santiago Carlo C.
B. 12B
C.Source- Ms. MG Facundo / http://answers.yahoo.com/question/index?qid=20070714021227AAXh83A
D.Osmosis- passage of molecules from a solution of low concentration to a solution of high concentration.....
Osmotic pressure
According to dictionaries, osmotic pressure is the pressure exerted by a dissolved substance in virtue to its molecular motion. But does the 'dissolved substance' mean the solute or the solvent? Does the pressure refer to the pressure exerted by the solute or the solvent molecules
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