| Term | Definition |
| activity series | a series of elements that have similar properties and that are arranged in descending order of chemical activity; examples of activity series include metals and halogens |
| chemical equation | a representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products |
| coefficient | a small whole number that appears as a factor in front of a formula in a chemical equation |
| combustion reaction | the oxidation reaction of an element or compound, in which heat is released |
| decomposition reaction | a reaction in which a single compound breaks down to form two or more simpler substances |
| electrolysis | the process in which an electric current is used to produce a chemical reaction, such as the decomposition of water |
| formula equation | a representation of the reactants and products of a chemical reaction by their symbols or formulas |
| precipitate | a solid that is produced as a result of a chemical reaction in solution |
| reversible reaction | a chemical reaction in which the products re-form the original reactants |
| single-displacement | a reaction in which one element or radical takes the place of another element or radical in a compound |
| synthesis reaction | a reaction in which two or more substances combine to form a new compound |
| word equation | an equation in which the reactants and products in a chemical reaction are represented by words |