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Internal energy ok1294990369

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Navin Joshi
Navin Joshi
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Learning check ,[object Object],[object Object],[object Object],[object Object],[object Object]
Write chemical equations for the following reactions – which have ∆H f Θ as their enthalpy change – including all state symbols ,[object Object],[object Object],[object Object],[object Object],[object Object]
Δ H c θ ,[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object]
HESS’S LAW ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ENTHALPY CYCLES & HESS'S LAW – using enthalpy changes of combustion to work out enthalpy changes of formation ,[object Object],[object Object]
Use your Chemistry data booklet to work out the enthalpy change of formation of methane from the enthalpy changes of combustion of hydrogen, carbon and methane .
ENTHALPY CYCLES & HESS'S LAW -using enthalpy changes of formation to determine enthalpy change of reaction ,[object Object]
 
15.2 Born-Haber Cycle (2.5h) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
THE BORN-HABER CYCLE This is a special form of a Hess cycle that deals with ionic compounds ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Born-Haber cycle calculations
Via an Energy level cycle. This is the method always required in examinations The sum of energies for route 1 = sum of energies for route 2
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The lattice energy can also be calculated using a computer programme and laws of electrostatics (Ref; Born-Meyer equation and the Madelung constant). ,[object Object],[object Object],[object Object],[object Object]

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  • 1.
  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7. Use your Chemistry data booklet to work out the enthalpy change of formation of methane from the enthalpy changes of combustion of hydrogen, carbon and methane .
  • 8.
  • 9.  
  • 10.
  • 11.
  • 12.
  • 14. Via an Energy level cycle. This is the method always required in examinations The sum of energies for route 1 = sum of energies for route 2
  • 15.
  • 16.