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| Term | Definition |
|---|---|
| Pure substance | A sample of matter,either a single element or a single compound, that has definite chemical and physical properties. |
| Compound | A substance made up of atoms two or more different elements joined by chemical bonds. |
| Molecule | The smallest unit of a substance that keeps all of the physical and chemical properties of that substance. |
| Chemical formula | A combination of chemical symbols and numbers to represent a substance. |
| Subscript | A small number written to the right and slightly below a chemical symbol to tell the number atoms of that element in the substance. |
| Mixture | A combination of two or more substances that are not chemically combined. |