| A | B |
|---|
| precipitate | solid that forms from a solution during a chemical reaction |
| endothermic reation | reaction that absorbs energy in the form of heat |
| exothermic reaction | reaction that releases energy in the form of heat |
| chemical equation | a short easy way to show a chemical reation using symbols instead of words |
| subscript | a number in a chemical formula that tells the number of atoms in a molecule |
| reactant | a substance that enters into a chemical reaction |
| product | a substance formed as a result of a chemical reaction |
| conservation of mass | matter is not created or destroyed during a chemical reaction |
| coefficient | a number placed in front of a chemical formula in and equation |
| synthesis | a chemical equation in which two or more substances combine to make a more complex compound |
| decomposition | a chemical reaction that breaks down compounds into simpler products |
| replacement reaction | a chemical reaction in which one element replaces another in a compound or in which two elements in different compounds trade places |
| activation energy | minimum amount of energy needed to start a chemical reaction |
| concentration | amount of one material in a given amount of another material |
| catalyst | a material that increases the rate of a reaction by lowering the activation energy |
| inhibitor | material used to decrease the rate of a reaction |
| enzyme | biological catalsts |
| combustion | a rapid reaction between oxygen and a substance called a fuel |
