AQA Jun 2013 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 lattice enthalpy of dissociation marks b lattice enthalpy can be calculated theoretically using a perfect ionic model explain the meaning of the term perfect ionic model mark extra space c suggest two properties of ions that influence the value of a lattice enthalpy calculated using a perfect ionic model property property marks wmp jun chem do not write outside the box d use the data in the table to calculate a value for the lattice enthalpy of dissociation for silver chloride enthalpy change value kj mol enthalpy of atomisation for silver first ionisation energy for silver enthalpy of atomisation for chlorine electron affinity for chlorine enthalpy of formation for silver chloride marks e predict whether the magnitude of the lattice enthalpy of dissociation that you have calculated in part d will be less than equal to or greater than the value that is obtained from a perfect ionic model explain your answer prediction compared with ionic model explanation marks turn over wmp jun chem

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