| A | B |
|---|
| change of state | a physical change that occurs when matter changes to another state (i.e., liquid, gas, or solid) |
| chemical change | a reaction or a change in a substance produced by chemical means that results in producing a different chemical |
| condensation | the process of changing from a gas (i.e., water vapor) to a liquid (i.e., dew); the act of making more dense or compact |
| evaporation | the process by which a liquid is converted to its vapor phase by heating the liquid |
| gas | one of the fundamental states of matter in which the molecules do not have a fixed volume or shape |
| heat of fusion | the amount of heat energy required to convert a unit mass of substance from a solid to a liquid through melting at a constant temperature and pressure |
| heat of vaporization | the amount of heat energy needed to change a unit mass of substance from a liquid to a gas at its boiling point |
| liquid | one of the fundamental states of matter with a definite volume but no definite shape |
| physical change | a reaction; a change in matter from one form to another, without forming new substances |
| solid | having a definite shape and a definite volume; one of the fundamental states of matter |
