| A | B |
|---|
| Chemical Bond | attraction between atoms when electrons are shared, transferred, or pooled |
| Chemical Equation | description of a reaction using element symbols and chemical formulas |
| Chemical Reaction | process in which atoms of one or more substances rearrange to form one or more new substances |
| Coefficient | number placed in front of an element symbol or chemical formula in an equation |
| Law of Conservation of Mass | states that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction |
| Product | new substance produced by a chemical reaction |
| Reactant | starting substance in a chemical reaction |
| Combustion | chemical reaction in which a substance combines with oxygen and releases energy |
| Decomposition | chemical reaction in which one compound breaks down and forms two or more substances |
| Double Replacement | describes a reaction in which the negative ions in two compounds switch places, forming two new compounds |
| Single Replacement | describes a reaction in which one element replaces another element in a compound |
| Synthesis | chemical reaction in which two or more substances combine and form one compound |
| Activation Energy | minimum amount of energy needed to start a chemical reaction |
| Catalyst | substance that increases the reaction rate by lowering the activation energy of a reaction |
| Endothermic Reaction | chemical reactions that absorb thermal energy |
| Enzyme | catalyst that speeds up chemical reactions in living cells |
| Exothermic Reaction | chemical reactions that release thermal energy |
| Inhibitor | substance that slows down, or even stops, a chemical reaction |
