1 Introduction

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Oxford Textbook Pages : 432 - 434

CGP Revision Guide Pages : 174 - 175

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Show Specification Ref : 6.1.1a, 6.1.1b

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Question 1 / 4

June 2015 QP – Unit 4 AQA Chemistry A-level_question_8 do not write outside the box equations for the hydrogenation of cyclohexene and of benzene together with the enthalpies of hydrogenation are shown h h h kj mol h kj mol a i use these data to show that benzene is kj mol more stable than the hypothetical compound cyclohexa triene mark a ii state in terms of its bonding why benzene is more stable than cyclohexa triene mark b three carbon carbon bonds are labelled on the structures shown these bonds are of different lengths write the letters w x and y in order of increasing bond length mark wmp jun chem c the structures of two cyclic dienes are shown do not write outside the box cyclohexa diene cyclohexa diene c i use the enthalpy of hydrogenation data given opposite to calculate a value for the enthalpy of hydrogenation of cyclohexa diene mark c ii predict a value for the enthalpy of hydrogenation of cyclohexa diene mark c iii explain your answers to questions c i and c ii in terms of the bonding in these two dienes marks turn over wmp jun chem
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Question 2 / 4

June 2014 QP – Unit 5 AQA Chemistry A-level_question_4 consider the following reaction scheme that starts from aqueous cu h o ions do not write outside the box reaction reaction reaction yellow green cu h o aq pale blue deep blue solution precipitate solution reaction green blue precipitate for each of the reactions to identify a suitable reagent give the formula of the copper containing species formed and write an equation for the reaction a reaction marks reagent copper containing species equation b reaction marks reagent copper containing species equation c reaction marks reagent copper containing species equation wmp jun chem d reaction do not write outside the box marks reagent copper containing species equation turn over for the next question turn over wmp jun chem
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Question 3 / 4

June 2015 QP – Unit 5 AQA Chemistry A-level_question_2 do not write outside the box table contains some bond enthalpy data bond bond enthalpy kj mol table h h o o h o a the value for the h o bond enthalpy in table is a mean bond enthalpy state the meaning of the term mean bond enthalpy for the h o bond marks b use the bond enthalpies in table to calculate a value for the enthalpy of formation of water in the gas phase marks wmp jun chem do not write outside the box c the standard enthalpy of combustion of hydrogen forming water in the gas phase is almost the same as the correct answer to question b c i suggest one reason why you would expect the standard enthalpy of combustion of hydrogen to be the same as the answer to question b mark c ii suggest one reason why you would expect the standard enthalpy of combustion of hydrogen to differ slightly from the answer to question b mark turn over for the next question turn over wmp jun chem
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Question 4 / 4

June 2015 QP – Unit 5 AQA Chemistry A-level_question_4 do not write outside the box a write an equation for the reaction that occurs when magnesium is heated in steam describe what you would observe when this reaction occurs marks equation observations b write an equation for the reaction that occurs when sodium is heated in oxygen describe what you would observe when this reaction occurs marks equation observations turn over for the next question turn over wmp jun chem
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