| A | B |
|---|
| polar molecule | molecule in which there is an internal separation of electric charge |
| hydrogen bond | bond created by the weak attraction of a slightly positive hydrogen atom to a slightly negative portion of another molecule |
| cohesion | tendency of molecules of the same kind to stick to one another |
| adhesion | attraction between unlike molecules |
| thermal energy | total amount of energy associated with the random movement of atoms and molecules in a sample of matter |
| temperature | measure of the average energy of random motion of particles in a substance |
| solution | uniform mixture of two or more substances |
| solvent | substance in a solution that dissolves the other substance and is present in the greater amount |
| aqueous solution | solution in which water is the solvent |
| acid | compound that donates H+ ions to an aqueous solution and measures less than 7 on the pH scale |
| base | compound that removes H+ ions from an aqueous solution and that measures more than 7 on the pH scale |
| pH scale | a range of numbers used to describe how acidic or basic a solution is; ranges from 0 (most acidic) to 14 (most basic) |
| buffer | substance that maintains a fairly constant pH in a solution by accepting H+ ions when their levels rise and donating H+ ions when their levels fall |
