| Term | Definition |
|---|
| Characteristic property | A quality of a substance that never changes and can be used to identify the substance. |
| Boiling point | The temperature at which a substance changes from a liquid to a gas. |
| Melting point | temperature at which a substance changes from a solid to a liquid. |
| Physical change | A change in a substance that does not change its identity: for example, a change of state. |
| Chemical change | A change in which one or more substances combine or break apart to form new substances. |
| Chemical activity | A characteristic property of a substance that indicates its ability to undergo a specific chemical change. |
| Mixture | Two or more substances that are mixed together but not chemically combined. |
| Solution | A very well-mixed mixture. |
| Pure substance | A substance made of only one kind of matter and having definite properties. |
| Element | A substance that cannot be broken down into other substances by chemical or physical means. |
| Compound | A substance made of two or more elements chemically combined. |
| Weight | A measure of the force of gravity on an object. |
| Mass | A measure of how much matter is in an object. |
| Volume | The amount of space that matter occupies. |
| Density | The measurement of how much mass of a substance is contained in a given volume. |
| International system of units (SI) | The system of units used by scientists to measure the properties of matter. |
| Atom | The smallest particle of an element. |
| Molecule | A combination of two or more atoms. |
| Chemical bond | The force that holds two atoms together. |
| Ore | A rock that contains a metal or other economically useful element. |
| Electrolysis | A process by which an electric current breaks chemical bonds. |
| Electrode | A metal strip used in electrolysis. |
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