Classifying Matter for Grade 8

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Matter

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Anything that has mass and takes up space

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Pure Substance

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Matter with a fixed composition; elements or compounds

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Mixture

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Combination of two or more substances; not chemically combined

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Element

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Pure substance; cannot be broken down; one type of atom

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Compound

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Pure substance; two or more elements chemically combined

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Homogeneous Mixture

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Mixture with uniform composition; also called solution

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Heterogeneous Mixture

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Mixture with non-uniform composition; distinct parts

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Physical Change

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Change in state or appearance; no new substance formed

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Chemical Change

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Change that forms new substances; chemical reaction

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Law of Conservation of Mass

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Mass is neither created nor destroyed in a chemical reaction