7th Grade Unit 1 Vocab Week 2

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Atom

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The smallest piece of an element you can have that retains all the properties of the element.

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Molecule

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The smallest particle of an element or compound that exists on its own.

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Chemical Formula

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A symbolic representation of a substance.

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Coefficient

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A number located in front of a chemical formula that represents the number of molecules of that substance.

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Compound

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A pure substance composed of two or more elements that are chemically combined.

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Electrolysis

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The chemical decomposition produced by passing an electric current through a solution.

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Element

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A pure substance that cannot be separated into simpler substances by chemical or physical means.

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Chemical Change

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A change that results in the formation of a new substance.