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| Chemistry | Study of the properties of matter and how matter changes. |
| Substance | A single kind of matter that is pure, meaning it always has a specific makeup or composition. |
| Matter | Anything that has mass or takes up space. |
| Physical Property | A characteristic of a pure substance that can be observed without changing it into another substance. |
| Chemical Property | A characteristic of a pure substance that describes its ability to change into different substances. |
| Element | A pure substance that cannot be broken down into any other substances by chemical or physical means. |
| Atom | The basic particle of matter from which all elements are made. |
| Compound | A pure substance made of two or more elements chemically combined. |
| Mixture | Made of two or more substances, elements, compounds or both and does not have a fixed composition. |
| Heterogeneous Mixture | A mixture where you can see the different parts. |
| Homogeneous Mixture | A mixture so evenly mixed that you can't see the different parts. |
| Solution | Another name for a homogeneous mixture. |
