| A | B |
|---|
| gas | form of matter that takes both the shape and volume of its container |
| liquid | form of matter that has an indefinite shape, flows, yet has a fixed volume |
| phase | any part of a sample with uniform composition and properties |
| physical change | properties of a material may change, but composition remains the same |
| solid | form of matter that has a definite shape and volume |
| vapor | the gaseous state of a substance that is a liquid or solid at room temperature |
| kinetic energy | energy an object has due to its motion |
| endothermic | absorbs energy from its surroundings |
| heat of fusion | energy needed for 1 gram of solid to become liquid |
| exothermic | releases energy to its surroundings. |
| vaporization | phase change from liquid to gas |
| heat of vaporization | energy needed for 1 gram of liquid to become gas |
| evaporation | substance change from a liquid to a gas at temperatures below the substance’s boiling point |
| vapor pressure | caused by collisions of vapor with walls of closed container |
| condensation | phase change from a gas/vapor to liquid |
| sublimation | phase change from solid directly to gas/vapor |
| deposition | phase change from gas/vapor directly to solid |
| phase change | reversible physical change that occurs when a substance changes from one state of matter to another |
| melting point | temperature at which solid/liquid phase changes occur |
| boiling point | temperature at which liquid/gas phase changes occur |
