| A | B |
|---|
| atom | the smallest unit of an element |
| boiling point | the temperature at which a liquid changes to a gas |
| density | the measure of mass of a substance per unit of volume |
| element | a substance that cannot be separated or broken into simplier substances by chemical means |
| heat | the energy transferred between objects that are at different temperatures |
| mass | amount of matter contained in a substance |
| matter | has mass and volume |
| melting point | the temperature and pressure at which a solid becomes a liquid |
| motion | an object's change in position relative to a reference point |
| particles | very small piece or part |
