Enthalpy Level Diagrams Flashcards
1
Q
How can enthalpy changes during reactions be illustrated?
A
On an enthalpy level diagram
2
Q
What do enthalpy level diagrams do?
A
- compare enthalpy of reactants with the enthalpy of the products
- show exothermic or endothermic nature of reaction
3
Q
Define activation energy
A
Minimum energy needed to start a reaction
4
Q
Does an exo or endo reaction have a low activation energy?
A
Exo
5
Q
What happens in exothermic reactions?
A
- there is a release of energy
- heat lost to surroundings
- value of enthalpy change has a negative sign, temp goes up
6
Q
What happens in endothermic reactions?
A
- there is a gain of energy
- heat gained by system from surroundings
- value of enthalpy change has a positive sign, temp goes down
7
Q
What do catalysts do?
A
- provides a different reaction reaction path with a lower activation energy
8
Q
A
