Physical Chemistry- Energetics Flashcards
1
Q
Define enthalpy change
A
Heat energy change at constant pressure
2
Q
Why do exothermic reactions have a negative bond enthalpy?
A
The system lose heat energy to raise temperature of surroundings
3
Q
Do endothermic reactions have positive or negative enthalpy changes?
A
4
Q
Define activation energy
A
The minimum amount of energy required to break bonds and start a reaction
5
Q
Define mean bond enthalpy
A
6
Q
What are standard conditions?
A
7
Q
Define standard enthalpy of formation
A
q
8
Q
Define standard enthalpy of combustion
A
9
Q
Define Hess’s Law
A
10
Q
A
