| A | B |
|---|
| chemical reaction | process wher atoms in substances are changed into different substances |
| reactant | substance that exists before a chemical reaction starts; located on the left side of the chemical equation |
| product | substances formed by a chemical reaction; located on th right side of the equation |
| activation energy | minimum amount of energy needed for reactants to form products in a chemical reaction |
| catalyst | substance that speeds up a chemical reaction |
| enzyme | protein that speeds up a biological reaction by lowering the activation energy needed to start the reaction |
| substrate | reactant to which an enzyme binds |
| active site | specific place where a substrate binds an enzyme |
