| A | B |
| chemical bond | the force that holds atoms together |
| compound | a pure substance made of two or more elements chemically combined |
| chemical formula | a combination of symbols that represents elementys and proportions in a compound |
| mixture | mixed together but not chemically combined |
| heterogeneous mixture | mixture in which substances are unevenly distributed |
| homogeneous mixture | mixture in which substances are evenly distributed |
| solution | a well-mixed mixture containing a solvent and at least one solute |
| weight | measure of the force of gravity on an object |
| mass | a measure of how much matter is in an object |
| International System of Units | Units used by scientists to measure the properties of matter |
| volume | the amount of space that matter occupies |
| density | mass divided by volume |