| A | B |
| matter | anything that has mass and takes up space |
| weight | the downward pull on an object due to gravity |
| volume | the amount of space that matter in an object occupies |
| length x width x height | volume |
| atom | smallest basic unit of matter |
| atoms | all matter is made of these |
| molecule | when two or more atoms bond together, or combine |
| atoms and molecules | these are always in motion |
| element | contains only a single type of atom |
| compound | two or more different types of atoms bonded together |
| mixture | combination of different substances that can be separated |