| Term | Definition |
| decomposition | the breaking down of organic wastes and dead organisms |
| combustion | the rapid reaction of a compound or element with oxygen to form an oxide and to produce heat |
| single replacment | describing a chemical reaction in which a reactive (a metal or a non-metal) and a compound react to produce another element and another compound |
| double replacement | describing a chemical reaction that usually involves two ionic solutions reacting to produce two ionic other compounds, either or both if which produce a precipitate |
| synthesis | a chemical reaction in which two or more reactants (A&B) combine to produce a single product (AB); also called a combination reaction |
| catalyst | a subtance that speeds up the rate of a chemical reaction without being changed or used up itself |
| surface area | the measure of how much area of an object is exposed; can affect reacion rate |