Energy Change and rates of reactions Flashcards
1
Q
Heat of reaction (∆H)
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
Activated complex
A
A high energy, unstable, temporary transition state between the reactants and products
6
Q
Reaction rate
A
Change in concentration per unit time of either a reactant or product
7
Q
Catalyst
A
Substance that increases the rate of the reaction but remains unchanged at the end of the reaction
