Module D Describing Substances

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Pure Substances

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A form of matter that has a constant composition and properties that are constant throughout the sample.

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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 formed when two or more chemical elements are chemically bonded together.

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Atom

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

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Molecule

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A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

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Formula Unit

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The lowest whole number ratio of ions represented in an ionic compound.

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Mixture

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A material made up of two or more different substances which are physically combined.

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Homogeneous mixture

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A mixture which has uniform composition and properties throughout.

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Heterogeneous mixture

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A mixture that consists of visibly different substances or phases.

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Matter

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Anything that has mass and takes up space.