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Bob Jones Chpt 2.3

Key Terms

QuestionAnswer
Solution The uniform dissolving of one substance into another substance.
Solute The dissolved substance in a solution.
Solvent The substance (often a liquid)into which a solute is dissolved.
concentration An expression of the proportions of solute to solvent in a solution.
diffusion The random movement of atoms, ions, or molecules from an area of higher concentration to an area of lower concentration.
equilibrium A state of balance as is seen when diffusion has progressed to the point where there are no longer regions of higher and lower concentrations.
polar molecule A molecule with charged poles (not balanced by symmetry).
cohesion The force that holds molecules of the same substance together; characteristic that causes water to move up plant stems.
adhesion The force that holds molecules of different substances together.
concentration gradient The difference between the number of molecules in one area and the number of the same molecules in an area nearby.
semipermeable membrane A membrane that is permeable to certain molecules or ions but not to others.
acid Any substance that yields hydrogen ions when dissolved in water; a substance that neutralizes a base.
base A substance that releases hydroxyl ions when dissolved in water;neutralizes an acid.
pH The measure of the concentration of hydrogen ions in a solution using values from 0-14
buffer A dissolved substance that makes a solution resistant to a change in its pH (the concentration of hydrogen ions).
osmosis Diffusion of water molecules through a semipermeable membrane.
Created by: LWelton
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