Energy Change and Rates of Reactions Flashcards
1
Q
Heat of Reaction
A
the net change of chemical potential energy of the system
2
Q
exothermic reactions
A
reactions which transform chemical potential energy into thermal energy
3
Q
endothermic reactions
A
reactions which transform thermal energy into chemical potential energy
4
Q
activation energy
A
the minimum energy required to start a chemical reaction OR
the energy required to form the activated complex
5
Q
the activated complex
A
a high energy temporary transition state between the reactants and the products
6
Q
reaction rate
A
the change in concentration per unit time of either a reactant or product
7
Q
a catalyst
A
a substance that increases the rate of the reaction but remains unchanged at the end of the reaction
