1 Enthalpy Definitions

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Oxford Textbook Pages : 258 - 259

CGP Revision Guide Pages : 54 - 55

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Show Specification Ref : 3.1.8.1

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June 2012 QP – Unit 5 AQA Chemistry A-level_question_3 do not write outside the box some thermodynamic data for fluorine and chlorine are shown in the table in the table x represents the halogen f or cl electronegativity electron affinity kj mol enthalpy of atomisation kj mol enthalpy of hydration of x g kj mol fluorine chlorine a explain the meaning of the term electron affinity marks b explain why the electronegativity of fluorine is greater than the electronegativity of chlorine marks extra space c explain why the hydration enthalpy of the fluoride ion is more negative than the hydration enthalpy of the chloride ion marks wmp jun chem do not write outside the box d the enthalpy of solution for silver fluoride in water is kj mol the hydration enthalpy for silver ions is kj mol d i use these data and data from the table to calculate a value for the lattice enthalpy of dissociation of silver fluoride marks d ii suggest why the entropy change for dissolving silver fluoride in water has a positive value mark d iii explain why the dissolving of silver fluoride in water is always a spontaneous process marks turn over wmp jun chem
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