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Substance undergo chemical reactions, which form new substances whose properties differ from the properties of the original substances.

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This law states that mass is neither created nor destroyed in chemicals and physical changes.

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The substances formed from a reaction are products.

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The starting materials in a chemical reaction are reactants.

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A chemical equation uses chemical symbols and formulas as a short way to describe a chemical reaction.

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A chemical formula is a shorthand way to use chemical symbols and numbers to represent a substance.

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The law of conservation of energy states that energy cannot be created or destroyed.

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A chemical reaction in which energy is taken in is called an endothermic reaction.

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A chemical reaction in which energy is released is called an exothermic reaction.

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A chemical reaction is a process in which one or more substances change to make one or more new substances.

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A precipitate is a solid substance that forms in a solution.