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heat of reaction (/\H)
the net change of chemical potential energy of the system
Exothermic reactions
reactions which transform chemical potential energy into thermal energy
Endothermic reactions
reactions which transform thermal energy into chemical potential energy
Activation energy
the minimum energy required to start a chemical reaction
The activated complex
a high energy, unstable transition state between the reactants and the products
Reaction rate
the change in amount or concentration per unit time of either a reactant or product
Catalyst
a substance that increases the rate of the reaction but remains unchanged at the end of the reaction