Science Concepts

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Atom

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the smallest unit of matter

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Molecule

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two or more atoms chemically bonded together

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Element

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a substance made of only one kind of atom

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Compound

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a substance made of two or more different elements bonded together

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Mixture

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a combination of two or more substances that retain their individual properties

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Solution

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a homogeneous mixture where one substance dissolves in another

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Physical Change

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a change in a substance that does not alter its chemical composition

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Chemical Change

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a change that produces new substances

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Density

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the mass of an object per unit volume

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Mass

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the amount of matter in an object