| A | B |
|---|
| atom | The smallest particle of an element. Atoms are the building blocks of matter. |
| catalyst | A chemical that changes the rate of a reaction. |
| change | The process of becoming something different. |
| chemical | A substance used in chemistry. |
| chemical reaction | 2 or more substances combine to make 1 or more new substances with different properties |
| chemist | A person trained in chemistry. |
| chemistry | The branch of science that deals with the composition, structure, and properties of matter. |
| citric acid | A white,oderless acid with a sour taste. |
| compound | A substance made of two or more elements that are chemically combined. |
| concentration | The relative amount of a substance in a mixture. |
| crystal | The solid form of a material that can be identified by its natural shape or pattern. |
