9.3 Bond Enthalpies Flashcards
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 are the condition of enthalpies?
A
Bond enthalpies are always endothermic.
Bond enthalpies always have a positive enthalpy value.
3
Q
What type of reaction is bond breaking?
A
endothermic
4
Q
What type of reaction is bond making?
A
exothermic
5
Q
What is the equation for calculating enthalpy change from average bond enthalpies?
A
Sum of bond enthalpies in the reactants - Sum of the bond enthalpies in the products.
