1.6.7 Bond Enthalpies Flashcards
1
Q
Bond dissociation energy (bond enthalpy)
A
Energy required to break 1 mole of specific covalent bonds of a compound in its gaseous state
2
Q
What is average bond enthalpy?
A
- Bond energies are affected by their environment
- So average bond enthalpy is the average of one type of bond in all environments
- Cannot be determined directly so enthalpy cycles are used to calculate them
3
Q
Calculation for enthalpy of reaction using bond energy is
A
Reaction = Bonds broken (endothermic so positive) + Bonds formed (exothermic so negative)
4
Q
Bond enthalpy calculation example
A
5
Q
Why does mean bold enthalpy vary in data books compared to experimental data?
A
In data books, average bond enthalpy taken for range of compounds with different environments
