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9 Cards in this Set
- Front
- Back
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Diffusion
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The movement of molecules from reqions of high concentration to low concentration. It is a passive process, requiring no additional energy input.
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Osmosis
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The passive movement (diffusion) of water molecules from areas of high concentration to low concentration.
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Semi-permeable membrane
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Some substances are able to pass through a membrane whilst others cannot.
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Solute
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A substance which is dissolved within another substance (the solvent). For example, sugar dissolving in water.
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Equilibrium
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When the molecules are even throughout a space - it is called EQUILIBRIUM
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Concentration gradient
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The concentration gradient is the amount of substance in a particular area. Diffusion is when the substance gradually spreads out in its' area.
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dialysis tubing
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A semi-permeable membrane made from cellulose. Has very small pores that allow some substance through but not others.
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Solvent
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A substance (usually liquid) which dissolves the solute. Water is an important solvent in Biology.
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Solution
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A mixture of the solvent and solute.
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