Chemical and Physical Changes

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Chemical Change

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A change that alters the identity of a substance, resulting in a new substance or substances with different properties.

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Color Change

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Visible change in a substance’s color; evidence of a chemical change.

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Physical Change

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A change to a substance without forming a new substance, such as changing size or state of matter.

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Physical Properties

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Characteristics that can be observed or measured, such as color, melting point, and conductivity.

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Production of Heat or Light

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Sign that a release of energy occurred during a chemical change.

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Production of a Precipitate

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Chemical change; creation of a solid in a liquid or inside another solid during a chemical reaction.

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Production of Gas

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Sign that a new substance formed from a chemical change; includes bubbles, fizzing, or odor change.

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Temperature Change

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Increase or decrease of heat energy in a substance; may be evidence of a new substance being formed during a chemical change.