| A | B |
| chemical reaction | process in which one or more substances are changed into new substances |
| reactant | in a chemical reaction, the substance that reacts |
| product | in a chemical reaction, the new substance that is formed |
| chemical equation | shorthand method to describe chemical reactions using chemical formulas and other symbols |
| coefficient | number in a chemical equation that represents the number or units of each substance taking part in a chemical reaction |
| balanced chemical equation | chemical equation with the same number of atoms of each element on both sides of the equation |
| combustion reaction | a type of chemical reaction that occurs when a substance reacts with oxygen to produce energy in the form of heat and light |
| synthesis reaction | chemical reaction in which two or more substances combine to form a different substance |
| decomposition reaction | chemical reaction in which one substance breaks down into two or more substances |
| single-displacement reaction | chemical reaction in which one element replaces another element in a compound |
| double-displacement reaction | chemical reaction that produces a precipitate, water, or a gas when two ionic compounds in solution are combined |
| precipitate | a solid that comes out of solution during a chemical reaction |
| exothermic reaction | chemical reaction in which energy is primarily released in the form of heat |
| endothermic reaction | chemical reaction that absorbs heat energy |
| catalyst | substance that speeds up a chemical reaction without being permanently changed itself |
| inhibitor | substance that slows down a chemical reaction or prevents it from occurring by combining with a reaction |
| coefiecient | The large number in front of the compound symbol |
| subscript | The number in the formula that tells the number of atoms in a molecule. The number below. |
| chemical formula | Shorthand way tof describing a chemical compound, example H2O is the formula for water. |