Common Terms in Physical Science

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Atom

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The smallest unit of matter that retains the properties of an element.

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Molecule

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A group of two or more atoms bonded together.

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Element

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A substance that cannot be broken down into simpler substances by chemical means.

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Compound

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A substance made of two or more different elements chemically bonded.

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Mixture

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A combination of two or more substances that are not chemically bonded.

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Matter

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Anything that occupies space and has mass.

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Mass

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The amount of matter in an object, measured in kilograms or grams.

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Volume

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The amount of space an object occupies.

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Density

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Mass per unit volume of a substance.

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Energy

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The capacity to do work or cause change.