Reaction Rates and Progress of Chemical Reactions

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Rate

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The ratio between two related quantities expressed in different units.

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Reaction Rate

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The rate of a chemical reaction; the speed at which reactants become products.

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Collision Theory

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A theory that states that bonds are broken when molecules collide with enough energy to break bonds in reactants and with the correct orientation to form bonds that make products.

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Activation Energy

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The minimum energy colliding particles must have in order to react.

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Activated Complex

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An unstable cluster of atoms that exists during the transition from reactants to products.

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Reaction Intermediate

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A product of one step in a multistep reaction and a reactant in the next step.

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Catalyst

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A substance that increases reaction rates by providing a lower energy path for the reaction without being used up during the reaction.