9.3 - Bond enthalpies Flashcards
(5 cards)
1
Q
What is average bond enthalpy?
A
The energy required to break one mole of a specified type of bond in a gaseous molecule
2
Q
What is a limitation of average bond enthalpies?
A
The actual bond enthalpy can vary depending on the chemical environment of the bond
3
Q
Energy is required to break bonds is bond breaking is
A
endothermic, ΔH is positive
4
Q
Energy is released when bonds form making bond making
A
exothermic, ΔH is negative
5
Q
How to calculate enthalpy change of reaction from bond enthalpies?
A
sum of bond enthalpies in reactants - sum of bond enthalpies in products
