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2 marksEnergetics

CAPE Chemistry Unit 1 · 2013 · Paper 2 · Question 4(a)

Calcium oxide (quicklime) is produced by roasting limestone and used to neutralize soil acidity. This question focuses on energetics.

Define the term 'standard enthalpy of formation'.

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Other parts of this question

  1. 4(b)Write a balanced equation for formation of CaO(s).[1 mark]
  2. 4(c)Construct a Born-Haber cycle for the formation of CaO(s) showing clearly, using equations, the steps of the enthalpy changes involved.[6 marks]
  3. 4(d)Distinguish between 'exothermic enthalpy change' and 'endothermic enthalpy change', citing enthalpy changes from your Born-Haber cycle in (c) to support your…[4 marks]
  4. 4(e)Explain, by writing an equation, how the data from the Born-Haber cycle can be used to calculate the lattice energy of CaO(s).[2 marks]

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