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9.3 Bond Enthalpies

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Total cards: 7•Content version: v3•Public deck•Updated: 8/1/2026

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#1
Front (Question)

What is average bond enthalpy?

Back (Answer)

Energy required to break one mole of a specified type of bond in a gaseous molecule

#2
Front (Question)

Are bond enthalpies endothermic or exothermic?

Back (Answer)

Endothermic, take in energy from surroundings

#3
Front (Question)

Limitations of actual bond enthalpy

Back (Answer)

Average bond enthalpy is calculated from actual bond enthalpies in different environments

#4
Front (Question)

Exothermic reactions

Back (Answer)

Energy released from bond formation > energy absorbed for bond breaking

#5
Front (Question)

Endothermic reactions

Back (Answer)

Energy released from bond formation < energy absorbed for bond breaking

#6
Front (Question)

Calculating enthalpy change of reaction

Back (Answer)

Bond enthalpy of reactants - bond enthalpy of products

#7
Front (Question)

Hess’ Law

Back (Answer)

If a reaction can take place by two routes, and the starting and finishing conditions are the same, the total enthalpy change is the same for each route