| A | B |
|---|
| physical properties | characteristics that can be seen or measured without changing the material |
| physical change | matter changes in size, shape, or phase without any change in identity; no new matter is formed |
| chemical properties | characteristics that can only be seen when the material changes and new materials are formed |
| chemical change | a change of matter that occurs when atoms link together in a new way, creating a new substance different from the original substances |
| chemical reaction | the process in which one or more substances are changed into one or more different substances |
| reactants | original substances in a chemical reaction |
| products | new substances created by a chemical reaction |
| What happens during a chemical reaction? | During chemical reactions the atoms in the reactants rearrange to form products with different properties. |
| How can we tell if there has been a chemical change? | The signs that a chemical change has occurred include: a color change, formation of a gas, and formation of light and heat. |
