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| Chemistry | the study of the structure, properties, and composition of substances, and the changes substances undergo |
| Chemical Change | an alteration of a substance that does affect its chemical composition |
| Chemical Property | properties one observes when the chemical composition is affected |
| Physical Change | an alteration of a substance that does not affect its chemical composition |
| Physical Property | properties one observes when the chemical composition is not affected |
| Matter | anything that has mass and takes up space |
| Substance | a type of matter having uniform and definite composition; can be either an element or a compound |
| Mixture | a type of matter consisting of a physical blend of substances; can be separated by physical processes |
| Element | the simplest form of matter |
| Compound | a chemical blend of 2 or more elements; can be separated by chemical processes |
| Homogeneous Mixture | a type of mixture with uniform composition |
| Heterogeneous Mixture | a type of mixture that does not have uniform composition |
| Solution | another name for a homogeneous mixture |
| Mass | the amount of matter an object contains |
| Solid | matter with definite volume and definite shape |
| Liquid | matter with definite volume but no definite shape; has the ability to flow |
| Gas | matter with no definite volume and no definite shape; has the ability to flow |
| Vapor | a substance in the gaseous state which, at room temperature, is normally a liquid or solid |
| Energy | the capacity for doing work |
| Potential Energy | the energy of position; stored energy |
| Kinetic Energy | the energy of motion |
| Chemical Reaction | the changing of substances to other substances by the breaking of old bonds and formation of new bonds |
| Chemical Symbol | a one or two letter representation of an element |
| Law of Conservation of Mass | Scientific Law that states mass cannot be created or destroyed |
| Law of Conservation of Energy | Scientific Law that states energy cannot be created or destroyed |
| Reactant | a starting substance in a chemical reaction |
| Product | a substance formed in a chemical reaction |
| Precipitate | a solid that separates from solution |
| Heat | the energy that is transferred from one body to another because of a temperature difference |
| Distillation | a purification process in which a liquid is evaporated/boiled and then condensed again to a liquid |
