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Exam Level Born Haber Cycles

Exam Level Born Haber Cycles. LOs To understand the style of question asked for this unit To improve the speed at which these questions are completed. Enthalpies of Solution. LOs To be able to calculate the enthalpy of solution. Define. The standard lattice enthalpy

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Exam Level Born Haber Cycles

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  1. Exam Level Born Haber Cycles LOs To understand the style of question asked for this unit To improve the speed at which these questions are completed.

  2. Enthalpies of Solution LOs To be able to calculate the enthalpy of solution

  3. Define • The standard lattice enthalpy • The standard enthalpy of hydration • The standard enthalpy of solution

  4. Dissolving

  5. Similar looking diagram OR Hess’s Law Triangle

  6. Worked example

  7. Ionic charge and radius Ions with a higher charge have a higher enthalpy of hydration (more exothermic) Ions with a smaller radius have a higher enthalpy of hydration (more exothermic)

  8. Exam Questions

  9. Entropy Entropy is a measure of the number of different ways particles can be arranged. It is a bit like how disordered or chaotic the system is. Substances are more energetically stable as the system become more disordered.

  10. Simple examples

  11. Entropy tells us if a reaction will happen ΔStotal = total entropy.

  12. Spontaneous Reactions For a reaction to happen spontaneously, the ΔG most be zero or negative.

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