| A | B |
|---|
| element | a substance made from only one type of atom |
| compound | a molecule made up of more than one type of atom |
| physical properties | can be observed without matter chemically changing |
| chemical properties | describe how an element interacts with other substances, and can only be observed when matter changes |
| reactants | the things interacting to form a new substance in a chemical reaction |
| products | the substances left after reactants react in a chemical reaction |
| molecular level | where chemical changes happen |
| chemical bonds | what are broken to form new substances in chemical reactions |
