AQA Jun 2016 Paper 5 Q2

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do not write outside the box a figure is a born haber cycle for potassium oxide k o figure is not to scale and not fully labelled a i complete figure by writing the formulae including state symbols of the appropriate species on each of the three blank lines marks figure k g o g k g e o g k g e o g k o s wmp jun chem do not write outside the box a ii table shows some enthalpy data table enthalpy change h kj mol enthalpy of atomisation of potassium first ionisation enthalpy of potassium enthalpy of atomisation of oxygen first electron affinity of oxygen second electron affinity of oxygen enthalpy of formation of potassium oxide use the data in table to calculate the enthalpy of lattice dissociation of potassium oxide k o marks b explain why the enthalpy of lattice dissociation of potassium oxide is less endothermic than that of sodium oxide marks turn over wmp jun chem

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