6.7 Bond Enthalpies/ AP CHEM
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4 Terms
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bond energy
energy “stored in a bond”
represents energy required/ released
bond energy increases as bond order increases (single, double, triple)
2
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overall enthalpy change (∆Hrxn)
∆Hrxn = Σ(BE of bonds broken) - Σ(BE of bonds formed)
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enthalpy of reactants and products
reactants: bonds will be broken; endo (+)
products: bonds will be formed; exo (-)
4
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how to determine Σ (# of bonds)
NOT from coefficient
from lewis structure
single = 1 bond
double = 1 bond
triple = 1 bond
in 2H2O, there are 4 O-H bonds
Note 
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