Energy Change And Rates Of Reactions Flashcards
1
Q
Heat of a reaction ΔH
A
The net change of chemical potential energy of the system
2
Q
Exothermic reaction
A
Reactions which transform chemical potential energy into thermal energy (ΔH<0)
3
Q
Endothermic reaction
A
Reactions which transform thermal energy into chemical potential energy (ΔH>0)
4
Q
Activation energy
A
The minimum energy required to start a chemical reaction
5
Q
Activated complex
A
A high energy, unstable 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
Catalyst
A
A substance that increases the rate of the reaction but remains unchanged at the end of the reaction
