water/enzymes

2. site, a region on an enzyme that binds to a protein or other substance during a reaction
5. substance that acts as a catalyst in living organisms
7. a solution that resists changes in pH when acid or alkali is added to it. Buffers typically involve a weak acid or alkali together with one of its salts
8. a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change
9. bond, primarily electrostatic force of attraction between a hydrogen atom which is covalently bound to a more electronegative atom or group
10. able to dissolve other substances
11. energy, the minimum quantity of energy which the reacting species must possess in order to undergo a specified reaction
13. scale used to specify the acidity or basicity of an aqueous solution
15. a liquid mixture in which the minor component (the solute) is uniformly distributed within the major component

1. a substance made by mixing other substances together
3. reaction, a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction
4. the substance on which an enzyme acts
6. the minor component in a solution, dissolved in the solvent
12. molecule or ion capable of either donating a proton
13. a thing or person that is the result of an action or process
14. molecule, a molecule in which one end of the molecule is slightly positive, while the other end is slightly negative