Bond Energies

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Bond Energies

Energy level diagrams:

In exothermic reactions:

  • Delta H is -ve - change in energy is negative
  • The products are at a lower energy than the reactants
  • The difference in height represents the energy given out in the reaction (per mole)
  • The initial rise in the line represents the energy needed to break the bonds - activation energy

(http://t0.gstatic.com/images?q=tbn:ANd9GcT-KKHrkhK3qp_GGbYs4R4rxHHOfB87WokGaRcBjZGRUdfrdMIKy9QBLS72nA)

In endothermic reactions:

  • Delta H is +ve - change in energy is positive
  • The products are at a higher energy than the reactants
  • The difference in height represents the energy taken in during the reaction

(http://4.bp.blogspot.com/-FBnFI0vEtQU/TWHU0aJpg-I/AAAAAAAAACI/Axl8HuBkceI/s1600/endo.gif)

Activation energy - minimum energy needed for the reaction to…

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