Bond Enthalpies (AQA A-Level Chemistry): Flashcards
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Bond enthalpy
Bond enthalpy
Energy to break 1 mole of specific covalent bond in gas
sign for bond breaking
sign for bond breaking
Positive (endothermic)
sign for bond forming
sign for bond forming
Negative (exothermic)
Mean bond enthalpy
Mean bond enthalpy
Average energy to break 1 mole of a bond across different compounds
Triple vs double bonds
Triple vs double bonds
Triple bonds are shorter and stronger
Double vs single bonds
Double vs single bonds
Double bonds are shorter and stronger
formula using bond enthalpies
formula using bond enthalpies
Energy of bonds broken - energy of bonds formed
State in mean bond enthalpy calculations
State in mean bond enthalpy calculations
Gaseous state
Accuracy of mean bond enthalpies
Accuracy of mean bond enthalpies
Approximations/averages, not exact
More accurate: mean bond enthalpy or Hess' Law
More accurate: mean bond enthalpy or Hess' Law
Hess' Law