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• Addition of energy to a substance can cause its state to change from a solid to a liquid and from a liquid to a gas.

• Reactants are substances that enter chemical reactions. Products are substances produced by chemical reactions.

• Enzymes lower the amount of activation energy necessary for a reaction to begin in living systems.

• A chemical reaction in which electrons are exchanged between atoms is called an oxidation-reduction reaction.

Vocabulary energy (p. 35) chemical reaction (p. 36) reactant (p. 36)

product (p. 36) metabolism (p. 36) activation energy (p. 36)

catalyst (p. 36) enzyme (p. 36) redox reaction (p. 37)

oxidation reaction (p. 37) reduction reaction (p. 37)

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