Basic Chemistry Terms

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Matter

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Anything that has mass and takes up space.

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Substance

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A form of matter that has a uniform and unchanging composition.

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Physical property

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A characteristic of matter that can be observed or measured without changing the substance's composition.

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Chemical property

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A characteristic of a substance that is observed during a reaction in which the chemical composition or identity of the substance is changed.

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Atom

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The basic unit of a chemical 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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Compound

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

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Mixture

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