| A | B |
|---|
| graph | a diagram that tells how two variabes are related |
| vary inversely | a term used to describe the relationship between two variables whose graph forms a curve that slopes downward |
| directly proportional | a term used to describe the relationship betweent wo variables whose graph is a straight line passing through the point (0,0) |
| thermal energy | energy from the movement of its particles |
| chemical energy | form of energy that comes from the chemical bonds within matter |
| law of conservation of energy | law stating that in every physical change and chemical change, the total amount of energy stays the same |
| melting | change in state from a solid to a liquid |
| freezing | change in state from liquid to a solid -- the reverse of melting |
| vaporization | occurs when a liquid gains enough energy to become a gas by evaporation or boiling |
| evaporation | process that occurs when vaporization takes place only on the surface of a liquid |
| boiling | process that occurs when vaporization takes place inside a liquid as well as on the surface |
| boiling point | temperature at which a substance changes from liquid to a gas |
| condensation | change of state from a gas to a liquid |
| sublimation | change in state from a solid directly to a gas without passing through the liquid state |
| chemical reaction | process in which subtances undergo forms new substance with different properties |
| physical change | changes in appearance but not properties of matter |
| physical properties | describe matter |
| chemical properties | describe how matter reacts and changes |
| burning, oxidizing, rusting, flammable | chemical property examples |
| mass, density, phase | physical property examples |
