| A | B |
|---|
| acid | A substance that releases hydrogen ions, H+, when it dissociates in a solution. |
| activation energy | the amount of energy needed to start a chemical reaction. |
| base | A substance that gives off hydroxide ions, OH-, when it dissociates in a solution. |
| chemical equation | A shorthand way to show the changes that take place in a chemical reaction. |
| chemical reaction | A process in which one or more substances are changed into one or more different substances. |
| decomposition reaction | A chemical reaction in which a compound breaks down into two or more substances. |
| double replacement reaction | A chemical reaction that occurs when the compounds in a reaction exchange ions. |
| endothermic reaction | A chemical reaction that takes in, or absorbs energy. |
| exothermic reaction | A chemical reaction that gives off energy. |
| Law of Conservation of Mass | A law stating that in a chemical reaction, the total mass of the reactants equals the total mass or the products. |
| neutralization | The chemical reaction between an acid and a base. |
| products | The new substances formed in a chemical reaction. |
| reactants | The starting substances in a chemical reaction. |
| salt | A compound formed from the positive metal ions of a base and the negative nonmetal ions of an acid. |
| single replacement reaction | A chemical reaction that occurs when one element replaces another element in a compound. |
| synthesis reaction | A chemical reaction in which two or more substances combine to form a compound. |
| balanced equation | An equation that obeys the Law of Conservation of Mass. |
| precipitate | A solid material that seperates out of a solution. |
| Hydroxide ion | OH- |
| Hydrogen ions | H+ |
| spontaneous reaction | A reaction that takes place with so little energy added to start the reaction that it seems as if no energy is needed. |
| pH scale | A scale of numbers from 0-14 used to describe the strength of an acid or base. |
| indicator | A compound that changes color according to pH. |
