| A | B |
|---|
| chemical reaction | process in which one or more substances change to make one or more new substances |
| precipitate | a solid that is produced as a result of a chemical reaction in a solution |
| chemical bond | a force that holds two atoms together in a molecule |
| diatomic molecule | molecule made up of two of the same atoms |
| chemical formula | a shorthand way to use chemical symbols and numbers to represent a substance |
| subscript | number written below and to the right of a chemical symbol in a formula |
| ionic compound | always has a charge of "zero" |
| chemical equation | a representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products |
| reactants | the starting materials in a reaction - on the left side of the equation |
| products | the substances formed in a reaction - found to the right in the equation |
| law of conservation of mass | says that mass is neither created nor destroyed in ordinary chemical and physical changes |
| coefficient | a number that is placed in front of a chemical symbol or formula |
| synthesis reaction | a reaction in which two or more substances combine to form one new compound |
| decomposition reaction | a reaction in which a single compound breaks down to form two or more simpler substances |
| single-displacement reaction | a reaction in which one element takes the place of another element in a compound |
| double-displacement reaction | a reaction in which ions from two compounds exchange places |
| exothermic reaction | a reaction in which energy is released |
| endothermic reaction | a chemical reaction in which energy is taken in |
| law of conservation of energy | energy cannot be created or destroyed, but it can change forms |
| rate of a reaction | the speed at which new particles form |
| activation energy | the smallest amount of energy that molecules need to react |
| higher temperature | causes a faster rate of reaction |
| concentration | a measure of the amount of one substance dissolved in another substance |
| surface area | the amount of exposed surface of a substance |
| inhibitor | a substances that slows down or stops a chemical reaction |
| catalyst | a substance that speeds up a reaction without being permanently changed |
