energy change and rates of reactions all definitions
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7 Terms
heat of a reaction (delta H)
the net change of chemical potential energy of the system
exothermic reaction
reactions which transform chemical potential energy in thermal energy
endothermic reactions
reactions which transform thermal energy into chemical potential energy
activation energy
the minimum energy required to start a chemical reaction OR the energy required to form the activated complex
activated complex
a high energy, unstable, temporary transition state between the reactants and the products
reaction rate
the change in 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
Note 
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