AQA Jun 2016 Paper 2 Q2 (with explained solutions) |

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AQA Jun 2016 Paper 2 Q2

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do not write outside the box standard enthalpy of combustion data can be used to calculate enthalpies of formation a state the meaning of the term standard enthalpy of combustion marks b the equation corresponding to the enthalpy of formation of propan ol is shown c s h g o g ch ch ch oh l table contains some standard enthalpy of combustion data table hc kj mol c s h g ch ch ch oh i use data from table to calculate a value for the standard enthalpy of formation of propan ol show your working marks wmp jun chem do not write outside the box c an equation for the complete combustion of gaseous propan ol is shown ch ch ch oh g o g co g h o g h kj mol table shows some bond enthalpy data table bond enthalpy kj mol c h c o o h c o o o use data from table and the enthalpy change for this reaction to calculate a value for the bond enthalpy of a c c bond in propan ol marks turn over for the next question turn over wmp jun chem

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question answers a the enthalpy heat energy change when mol of a substance is burned reacts completely in oxygen with all reactants and products in their standard states or with all reactants and products in their normal states at k given temp kpa mark scheme a level chemistry chem june mark additional comments guidance if enthalpy of formation definition given ce o not just energy allow alternatives for substance e g molecule compound element allow reacts in excess oxygen allow everything for reactants and products penalise incorrect conditions if given allow normal states under standard conditions correct answer scores m also scores m ignore units check for ae in working can award m as ecf error carried forward from m if m not given due to ae h hc reactants hc products or correctly and fully balanced cycle h or h h kj mol scores mark only b of mark scheme a level chemistry chem june c h b reactants b products or h bonds broken bonds formed or h b c c b c h b c o b o h b o o b c o b o h b c c or b c c or b c c or b c c b c c kj mol total correct answer gains marks m also scores m may see no in bonds broken and x in made gives if not check for ae this would lose m but could gain m and m scores due to c c not m from incorrect m unless incorrect m is due to ae ignore units if no other mark awarded then allow if or or or seen of

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Topics to revise

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