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BORN HABER calculations, bond enthalpy and free energy chang
Transcript of BORN HABER calculations, bond enthalpy and free energy chang
SL/HL To know how to do average bond enthalpy calculations
HL To know how to do BH cycle calculations
HL To know combinations for free energy changes
Bond dissociation enthalpy
The bond dissociation enthalpy is the energy needed to break one mole of the bond to give separated atoms - everything being in the gas state.
many bond enthalpies are actually quoted as mean (or average) bond enthalpies, although it might not actually say so. Mean bond enthalpies are sometimes referred to as "bond enthalpy terms".
In fact, tables of bond enthalpies give average values in another sense as well, particularly in organic chemistry. The bond enthalpy of, say, the C-H bond varies depending on what is around it in the molecule. So data tables use average values which will work well enough in most cases.
HL - Give three situations where there is a CHANGE in entropy
SL - Explain Hess' Law
Some BE calculations
Watch Mr Harvey
Combinations for free energy changes
See page 44
Born Haber Calculations