AQA Jun 2014 Paper 5 Q1

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section a answer all questions in the spaces provided do not write outside the box a write an equation for the process that has an enthalpy change equal to the electron affinity of chlorine mark b in terms of electrostatic forces suggest why the electron affinity of fluorine has a negative value marks c i complete the born haber cycle for silver fluoride by adding the missing species on the dotted lines marks ag g ag g ag g f g ag g ag s agf s wmp jun chem do not write outside the box c ii use the cycle in question c i and the data in table to calculate a value in kj mol for the bond enthalpy of the fluorine fluorine bond table enthalpy change enthalpy of atomisation for silver first ionisation energy for silver electron affinity for fluorine experimental enthalpy of lattice dissociation for silver fluoride enthalpy of formation for silver fluoride marks value kj mol question continues on the next page turn over wmp jun chem do not write outside the box d a theoretical value for enthalpy of lattice dissociation can be calculated using a perfect ionic model the theoretical enthalpy of lattice dissociation for silver fluoride is kj mol d i explain why the theoretical enthalpy of lattice dissociation for silver fluoride is different from the experimental value that can be calculated using a born haber cycle marks extra space d ii the theoretical enthalpy of lattice dissociation for silver chloride is kj mol explain why this value is less than the value for silver fluoride marks extra space 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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