Vocabulary 2.2

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Chemical Reaction

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A process that involves rearrangement of the molecular or ionic structure of a substance.

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Activation Energy

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Energy needed to start a chemical reaction

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Reactant

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A substance that takes part in and undergoes change during a reaction.

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Product

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A substance that is formed as the result of a chemical reaction.

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Exothermic Reaction

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A chemical reaction that releases energy by light or heat.

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Endothermic Reaction

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A chemical reaction that absorbs energy from its surroundings.

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Catabolic Reaction

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A type of metabolic reaction that breaks down molecules into smaller units and releases energy.

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Anabolic Reaction

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A type of metabolic reaction that builds larger molecules from smaller ones and requires energy.