AQA Jun 2013 Paper 2 Q2 (with explained solutions) |

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AQA Jun 2013 Paper 2 Q2

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do not write outside the box the following pairs of compounds can be distinguished by simple test tube reactions for each pair give a suitable reagent that could be added separately to each compound to distinguish between them describe what you would observe in each case a agbr s and agi s reagent observation with agbr s observation with agi s marks b hcl aq and hno aq reagent observation with hcl aq observation with hno aq marks c cyclohexane and cyclohexene reagent observation with cyclohexane observation with cyclohexene marks wmp jun chem d butanal and butanone do not write outside the box reagent observation with butanal observation with butanone marks turn over for the next question turn over wmp jun chem there are no questions printed on this page do not write on this page answer in the spaces provided wmp jun chem

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question a mark scheme general certificate of education a level chemistry unit chemistry in action june marking guidance m concentrated sulfuric acid or c onc h so m cream solid turns orange or orange red brown fumes gas vapour m yellow solid turns black or purple fumes gas vapour or correct reference to h s observation eg bad egg smell or as an alternative m concentrated ammonia or c onc nh m cream solid dissolves solution formed m precipitate remains does not dissolve insoluble or no reaction no change yellow solid turns to white solid mark comments if no reagent or incorrect reagent in m ce and no marks for m or m if dilute sulfuric acid or aq alone ce if h so sulfuric acid given but not stated whether dilute or concentrated penalise m and mark on for m and m if incorrect formula for the acid penalise m but mark m and m if nh ammonia aq ammonia given but not stated as concentrated or if dilute ammonia given penalise m but mark on for m and m ignore partially and ignore clear in m if incorrect formula for ammonia penalise m but mark m and m in m for ammonia ignore nothing happens ignore no observation b mark scheme general certificate of education a level chemistry unit chemistry in action june m agno or silver nitrate or any soluble silver salt m white precipitate or white solid white suspension m remains colourless or no reaction or no observed change or no precipitate credit alternative test for nitrate ions if no reagent or incorrect reagent in m ce and no marks for m or m an insoluble silver salt or tollens or ag or ammoniacal silver nitrate or hcl agno ce for the clip for m credit acidified or hno silver nitrate for m and mark on if silver ions or incorrect formula for silver nitrate penalise m but mark m and m for m ignore cloudy solution or suspension for m ignore nothing happens ignore no observation ignore clear ignore dissolves c mark scheme general certificate of education a level chemistry unit chemistry in action june m br or bromine water or bromine in ccl organic solvent either order m stays orange red yellow brown the same or no reaction or no observed change or reference to colour going to cyclohexane layer m decolourised goes colourless loses its colour or as an alternative use kmno h so m acidified potassium manganate vii or kmno h so or kmno h or acidified kmno m stays purple or no reaction or no observed change m purple to colourless solution or goes colourless credit alternative test using iodine for m m brown to purple or accept no change m colourless credit alternative test using concentrated h so m no change m brown if no reagent or incorrect reagent in m ce and no marks for m or m no credit for combustion observations ce for m in every case ignore nothing happens ignore no observation ignore clear with bromine water for m it must be a whole reagent and or correct formula if oxidation state given in name it must be correct for m penalise incorrect formula but mark m and m with potassium manganate vii for m if manganate or manganate iv or incorrect formula or no acid penalise m but mark m and m credit alkaline neutral kmno for possible full marks but m gives brown precipitate or solution goes green mark scheme general certificate of education a level chemistry unit chemistry in action june d or the silver mirror test on their m tollens reagent or ammoniacal silver nitrate or a description of making tollens ignore either agno or ag nh own but mark m and m m silver mirror or black solid precipitate ignore silver precipitate m stays colourless or no reaction or no observed change alternative using fehling s solution m fehling s solution or benedict s solution ignore cu aq or cuso on their own but mark m and m m red solid precipitate credit orange or brown solid m stays blue or no reaction or no observed change alternative using k cr o h so m acidified potassium dichromate or k cr o h so or k cr o h or acidified k cr o m orange to green solution or goes green m stays orange or no reaction or no observed change alternative using kmno h so m acidified potassium manganate vii or kmno h so or kmno h or acidified kmno m purple to colourless solution or goes colourless m stays purple or no reaction or no observed change if no reagent or incorrect reagent in m ce and no marks for m or m for m in every case ignore nothing happens ignore no observation with potassium dichromate vi for m if dichromate or potassium dichromate iv or incorrect formula or no acid penalise m but mark m and m for m ignore dichromate described as yellow or red with potassium manganate vii for m if manganate or potassium manganate iv or incorrect formula or no acid penalise m but mark m and m credit alkaline neutral kmno for possible full marks but m gives brown precipitate or solution goes green

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Topics to revise

AQA > Inorganic chemistry > Transition metals >

9 Manganate titration

AQA > Inorganic chemistry > Group 7 AS >

3 Reaction of halide with silver nitrate

AQA > Organic Chemistry > Alcohols AS >

1 Oxidation

AQA > Inorganic chemistry > Periodicity AS >

1 Periodicity

AQA > Inorganic chemistry > Group 7 AS >

4 Reaction of halide salts with concentrated sulfuric acid

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