| A | B |
|---|
| chemical reactions | change substances into different substances |
| reactants | starting substances in a reaction |
| products | substances made in a chemical reaction |
| bond energy | amount of energy that will break a bond |
| equilibrium | when the reactants & products are made at the same rate |
| activation energy | energy required for a reaction to start |
| exothermic | energy is released during a reaction |
| endothermic | energy is absorbed during a reaction |
| catalyst | substance that lowers activation energy |
| enzyme | a catalyst in living things |
| substrate | specific reactants for an enzyme |
| active site | place where the substrate bonds to an enzyme |
