| A | B |
|---|
| activation energy | minimum amount of energy needed to start a chemical reaction |
| concentration | the amount of a substance in a given volume |
| catalysts | a material that increases the rate of a reaction by lowering the activation energy |
| enzymes | provide a surface on which reactions can take place |
| inhibitor | a material used to decrease the rate of a reaction |
| combustion | a rapid reaction between oxygen and a substance |
| fuel | a material that releases energy when it burns |
| synthesis | when 2 or more elements or compounds combine to make a more complex substance |
| decomposition | breaks down compounds into simpler products |
| replacement | 2 elements in different compounds trade places |
