Enthalpies Flashcards
1
Q
- Enthalpy (delta h)
A
Exothermic reaction - energy is released, surroundings get warmer.
2
Q
+ enthalpy (delta h)
A
Endothermic energy taken in from surroundings
3
Q
Bond breaking
A
Endothermic (+)
4
Q
Bond making
A
Exothermic (-)
5
Q
Bond enthalpy vs mean bond enthalpies
A
Bond relates to one compound / diatomic molecule whereas mean refer to an average energy in a number of different compounds
6
Q
Formula for Eh
A
Eh = (delta Hc) * n
Delta Hc is the energy given off by the complete combustion of one mole
7
Q
More exact way fo calculating energy from a source
A
Use of a bomb calorimeter
