AQA Jan 2010 Paper 5 Q4

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the table below gives some values of standard enthalpy changes use these values to answer the questions areas outside the box will not be scanned for marking name of enthalpy change h kj mol enthalpy of atomisation of chlorine electron affinity of chlorine enthalpy of atomisation of silver first ionisation enthalpy of silver enthalpy of formation of silver chloride a calculate the bond enthalpy of a cl cl bond mark b explain why the bond enthalpy of a cl cl bond is greater than that of a br br bond marks c suggest why the electron affinity of chlorine is an exothermic change mark wmp jan chem d the diagram below is an incomplete born haber cycle for the formation of silver chloride the diagram is not to scale areas outside the box will not be scanned for marking ag g cl g ag s cl g agcl s d i complete the diagram by writing the appropriate chemical symbols with state symbols on each of the three blank lines marks d ii calculate a value for the enthalpy of lattice dissociation for silver chloride marks question continues on the next page turn over wmp jan chem areas outside the box will not be scanned for marking e the enthalpy of lattice dissociation for silver chloride can also be calculated theoretically assuming a perfect ionic model e i explain the meaning of the term perfect ionic model mark e ii state whether you would expect the value of the theoretical enthalpy of lattice dissociation for silver chloride to be greater than equal to or less than that for silver bromide explain your answer theoretical lattice enthalpy for silver chloride explanation marks extra space e iii suggest why your answer to part d ii is greater than the theoretical value for the enthalpy of lattice dissociation for silver chloride marks wmp jan chem there are no questions printed on this page do not write on this page answer in the spaces provided turn over wmp jan chem

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