MS-PS1-2: Definitions, Key Concepts & Examples

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Chemical Reaction

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Process where substances change into new substances.

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Reactants

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Starting substances in a chemical reaction.

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Products

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Substances formed from a chemical reaction.

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Physical Change

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Change affecting form, not chemical identity.

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Chemical Change

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Change resulting in new substances.

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Indicators of Reaction

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Color change, gas, precipitate, temperature change.

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Conservation of Mass

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Mass is neither created nor destroyed.

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Exothermic Reaction

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Releases heat.

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Endothermic Reaction

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Absorbs heat.

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Precipitate

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Solid formed from a solution during a reaction.