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
5
Q
Activation complex
A
A high energy, unstable, temporary transition state between the reactants and products
6
Q
Catalyst
A
Substance that increases the rate of the reaction but remains unchanged at the end of the reaction
7
Q
Factors affecting reaction rates
A
- Concentration (solutions)
- Pressure (gases)
- Surface area (solids)
- Temperature
- Catalyst
