AQA Jun 2015 Paper 5 Q1

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section a answer all questions in the spaces provided do not write outside the box a define the term electron affinity for chlorine marks b complete this born haber cycle for magnesium chloride by giving the missing species on the dotted lines include state symbols where appropriate the energy levels are not drawn to scale marks mg g mg g mg g mg g mg g mg s mgcl s wmp jun chem do not write outside the box c table contains some enthalpy data table enthalpy change kj mol enthalpy of atomisation of magnesium enthalpy of atomisation of chlorine first ionisation energy of magnesium second ionisation energy of magnesium enthalpy of formation of magnesium chloride lattice enthalpy of formation of magnesium chloride use your born haber cycle from question b and data from table to calculate a value for the electron affinity of chlorine marks question continues on the next page turn over wmp jun chem do not write outside the box d table contains some more enthalpy data table enthalpy change kj mol enthalpy of hydration of mg ions enthalpy of hydration of na ions enthalpy of hydration of cl ions d i explain why there is a difference between the hydration enthalpies of the magnesium and sodium ions marks d ii use data from table and table to calculate a value for the enthalpy change when one mole of magnesium chloride dissolves in water marks wmp jun chem turn over for the next question do not write on this page answer in the spaces provided turn over wmp jun chem

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