Chemistry Terms to Know

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Element

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A pure substance consisting of only one type of atom.

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Compound

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

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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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Molecule

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The smallest unit of a chemical compound that can exist; composed of two or more atoms bonded together.

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Subscript

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A number written slightly below and to the right of a chemical symbol in a formula, indicating the number of atoms of the element in the compound.

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Chemical Formula

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A representation of a substance using symbols for its constituent elements.

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Heterogeneous Mixture

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A mixture in which the components are not uniformly distributed, and different parts of the mixture are visible.

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Homogeneous Mixture

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A mixture in which the composition is uniform throughout.

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Matter

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Anything that has mass and takes up space.

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Atom

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The basic unit of a chemical element.