Diffusion

Diffusion and osmosis

1.a) Bulk movement is the overall movement of a fluid. The molecules all move in the same direction. Diffusion however is the random movement of molecules which usually results in a fairly even distribution. In other words the movement is not guaranteed to move in one direction but the probability that it will move in […]

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Osmosis in Plant Cells

From my background knowledge I predict that as the concentration of the sucrose solution that the potato cylinder is placed in increases, the size and weight of the potato cylinder will decrease over the period of 48hours, and vice versa, if sucrose solution concentration decreases, the potato cylinder should swell up and its size and […]

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Osmosis in Plant Cells

I shall begin this investigation with an explanation of what osmosis is. Osmosis is a special case of diffusion, which involves exchange of water particles across a semi-permeable membrane. Normally diffusion takes place in particles in the form of gas. Diffusion is where a high concentration of particles move over to where there is a […]

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Osmosis – College Essay

Osmosis is the diffusion of a solvent from a less concentrated solution into a more concentrated solution through a semi-permeable membrane, permeable to the solvent but not to the solute. (The Oxford Popular English Dictionary, reprinted 2000, Oxford University Press.) Diffusion is the movement of particles from a high concentration to a low concentration until […]

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The Effect of Salt Concentration on Osmosis in Potato Cells

We should first explain what Osmosis is. It’s a passage of water from a region of high water concentration through membrane to a region of low water. Semi membrane is a very thin layer of material, which allows some things to pass through them but prevent other things from passing through. The cells allow small […]

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Osmosis – College Essay

Tonicity refers to the concentration of solutes in a solution (Lab 6-7). There are three stages of tonicity: Isotonic, hypertonic and hypotonic. Four unknown solutions were given and labeled as followed: Solution A, Solution B, Solution C, and Solution D. Since potato cells were used for this type of experiment, in an Isotonic solution the […]

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Osmosis and the Visking Tubing

Osmosis is the net movement of water from a high concentration of water to a low concentration of water down a concentration gradient. This is done to equalise the solute concentrations on the two sides. Therefore, in other words, the movement of water is depended on the concentration of dissolved solute in the water (in […]

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AP Bio Osmosis and Diffusion lab

1) The relationship between the rate of diffusion, volume and surface area is that the surface area of a subject somewhat correlates with the volume of the object. When the surface area and volume are set up as a ratio, this gives a good idea as to how fast the rate of diffusion will be. […]

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