| A | B |
|---|
| indicator | a sign that a chemical reaction is taking place |
| reactant | substance(s) that enters into a chemical reaction |
| product | substance(s) produced by a chemical reaction |
| exothermic | a reaction during which energy is released |
| endothermic | a reaction during which energy is absorbed |
| activation energy | energy required for a reaction to occur |
| kinetics | study of the rates of chemical reactions |
| reaction time | measure of how quickly reactants change into products |
| collision theory | theory that relates reaction rates to molecular collisions |
| catalyst | substance that increases or decreases the rate of reaction |
