| A | B |
|---|
| synthesis reaction | two or more substances combine to make a more complex substance |
| decomposition reaction | compounds break down into simpler products |
| replacement reaction | one element replaces another in a compound |
| change of energy | every chemical reaction involves one |
| activation energy | minimum amount of energy to start a reaction |
| rate of a reaction | affected by concentration, surface area, temperature |
| concentration | amount of one material in a given volume of another material |
| enzyme | biological catalyst found in all living things |
