| A | B | 
|---|
| Reactants | the starting materials in a chemical reaction | 
| Products | the substances formed from a reaction | 
| Synthesis reaction | a reaction in which 2 or more substances combine to form a single compount | 
| Decomposition reaction | a reaction in which a single compound breaks down to form two or more simpler substances | 
| single-replacement reaction | a reaction in which an element takes the place of another element that is part of a compound. | 
| Double-replacement reaction | a reaction in which ions in two compounds switch places | 
| exothermic reaction | a chemical reaction in which energy is released (can give off heat) | 
| endothermic reaction | a chemical reaction in which energy is absorbed | 
| ionic compounds | compounds that contain ionic bonds | 
| covalent compounds | compounds composed of elements that are covalently bonded | 
| acid | any substance that has a pH of 6 or less, and tastes sour | 
| base | any substance that has a pH of 8 or moe, and tastes bitter |