| A | B |
| Catalyst | A substance that speeds a chemical reaction without being consumed or significantly changed. |
| Nuclear Fission | The process by which a nucleus is split into two or more fragments releasing neutrons and massive amounts of energy. |
| Rate of Reaction | The speed at which new substances are created or broken down. |
| Decomposition Reaction | A reaction in which a single compound breaks down to form two or more simpler substances. |
| Surface Area | The available space with which a substance can react. |
| Double-Replacement Reaction | A reaction where the exchange of atoms or ions between two compounds occur producing a gas, water or a precipitate. |
| Nuclear Fusion | The process by which lighter nuclei combine to form heavier nuclei releasing massive amounts of energy. |
| Reactant | The starting substances in a chemical reaction. |
| Single-Replacement Reaction | A reaction in which one element or radical takes the place of another element or radical in a compound. |
| Synthesis Reaction | A reaction in which substances combine to form a new substance. |
| Chemical Reaction | A change in which one or more substances are converted to different substances. |
| Combustion Reaction | The oxidation reaction of an organic compound in which heat is released. |
| Concentration | The proportion of a solute dissolved in a solvent or solution. |
| Product | The substance that forms in a chemical reaction. |
| Radioactive Decay | The disintegration of an unstable nucleus into one or more nuclides emitting radiation. |
| Exothermic Reaction | A chemical reaction in which heat is released into the surroundings. |
| Endothermic Reaction | A chemical reaction that requires heat or heat is absorbed. |