energy change & Rates of reactions

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8 Terms

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heat of reaction (/\H)

the net change of chemical potential energy of the system

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Exothermic reactions

reactions which transform chemical potential energy into thermal energy

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Endothermic reactions

reactions which transform thermal energy into chemical potential energy

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Activation energy

the minimum energy required to start a chemical reaction

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The activated complex

a high energy, unstable transition state between the reactants and the products

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Reaction rate

the change in amount or concentration per unit time of either a reactant or product

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Catalyst

a substance that increases the rate of the reaction but remains unchanged at the end of the reaction

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