9.3 Bond Enthalpies Flashcards
1
Q
What is the limitation of using average bond enthalpies?
A
The actual bond enthalpy can vary depending on the chemical environment of the bond.
2
Q
Describe endothermic and exothermic reactions in terms of bond breaking and bond making
A
Endothermic = bond breaking Exothermic = bond making
3
Q
How do you calculate enthalpy change from average bond enthalpies of gaseous molecules?
A
Bond enthalpies in reactants - bond enthalpies in products
4
Q
What is an average bond enthalpy ?
A
The energy required to break one mole of a specified type of bond in a gaseous molecule
