| A | B |
|---|
| chemical reaction | Energy-requiring process in which chemical changes occur. Results in the formation of new substances that have different properties than the original substances. |
| reactant | Substance that exists before a chemical reaction begins. |
| product | Substance that is formed by a chemical reaction. |
| endothermic reaction | Chemical reaction in which energy is absorbed. |
| exothermic reaction | Chemical reaction that releases energy. |
| rate of reaction | Measure of how quickly a chemical reaction occurs. |
| inhibitor | Substance that doesn't totally stop a chemical reaction but slows it down. |
| catalyst | Substance that speeds up a chemical reaction but is not used up or permanently changed. |
