| A | B |
|---|
| chemical property | property of a substance that can be used to identify it and that describes how that substance reacts with other substances |
| combustibility | substance’s ability to burn |
| reactivity | how easily a substance reacts with other substances |
| stability | not usually reacting with other substances |
| chemical change | change in matter that forms one or more new substances, also called chemical reaction |
| reactant | substance that changes, or reacts, in a chemical reaction |
| chemical reaction | change in matter in which two or more elements or compounds (reactants) combine to form different compounds or elements (products) |
| product | new substance produced in a chemical reaction |
| law of conservation of mass | law that states that matter cannot be created or destroyed during chemical reactions |
| precipitate | insoluble solid that forms as a product |
| chemical equation | symbols that show how matter changes during a chemical reaction, for example: 2H2+O2 2H2O |
| exothermic reaction | reaction in which energy is given off |
| endothermic reaction | reaction in which energy is absorbed |
| activation energy | smallest amount of energy needed to start a chemical reaction |
| rate of reaction | how fast a chemical reaction |
| inhibitor | substance that slows down a chemical reaction |
| decomposition | decay of a substance; the breakdown |
| catalyst | substance that speeds up a chemical reaction, but is not changed during the reaction |
| enzyme | catalyst produced by living things that speeds up chemical reactions |
| acid | compound that releases hydrogen ions (H+) |
| hydrogen ion | hydrogen atom that loses its one |
| corrosive | able to “eat away” or break down materials such as metal or living matter |
| base | compound that releases hydroxide ions (OH–) in water, giving it a pH above 7 |
| hydroxide ion | negative ion made of hydrogen and oxygen (OH–) |
| pH | measure of the concentration of hydrogen ions |
| indicator | substance that changes color in the presence |
| salt | ionic compound that contains metal and nonmetal ions; product of a reaction between an acid and a base |
| neutralization reaction | reaction between an acid and a base that produces water and a salt |
