AQA Jun 2015 Paper 2 Q2 (with explained solutions) |

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AQA Jun 2015 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 of compounds give a reagent or combination of reagents that when added separately to each compound could be used to distinguish between them state what is observed in each case a butan ol and methylpropan ol marks reagent observation with butan ol observation with methylpropan ol b propane and propene marks reagent observation with propane observation with propene wmp jun chem c aqueous silver nitrate and aqueous sodium nitrate do not write outside the box marks reagent observation with aqueous silver nitrate observation with aqueous sodium nitrate d aqueous magnesium chloride and aqueous barium chloride marks reagent observation with aqueous magnesium chloride observation with aqueous barium chloride 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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or converse for bromine marking guidance 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 solution remains orange or no reaction or no observed change alternative using kmno h so m acidified potassium manganate vii potassium permanganate or kmno h so or kmno h or acidified kmno m colourless solution or goes colourless m solution remains purple or no reaction or no observed change question a mark scheme a level chemistry chem june mark penalise m if covalent bonds are broken comments if no reagent or incorrect reagent in m ce and no marks for m m or m if incomplete inaccurate attempt at reagent e g dichromate or dichromate iv or incorrect formula or no acid penalise m only and mark on for m ignore dichromate described as yellow or red for m ignore nothing happens or no observation for m if incomplete inaccurate attempt at reagent e g manganate or manganate iv or incorrect formula or no acid penalise m only and mark on credit alkaline kmno for possible full marks but m gives brown precipitate or solution goes green of mark scheme a level chemistry chem june b m shake with br or bromine water or bromine in ccl organic solvent m stays orange red yellow brown the same or no reaction or no observed change m decolourised goes colourless loses its colour orange to colourless or as alternatives use kmno h so m acidified potassium manganate vii potassium permanganate or kmno h so or kmno h or acidified kmno m stays purple or no reaction or no observed change m decolourised goes colourless loses its colour use iodine m iodine or i ki or iodine solution m no change m decolourised goes colourless loses its colour use concentrated sulfuric acid m concentrated h so m no change if no reagent or incorrect reagent in m ce and no marks for m m or m if incomplete inaccurate attempt at reagent e g br penalise m only and mark on no credit for combustion observations ce for m in every case ignore nothing happens ignore no observation ignore clear for m it must be a whole reagent and or correct formula for m penalise incorrect attempt at correct formula but mark m and m with potassium manganate vii if incomplete inaccurate attempt at reagent e g manganate or manganate iv or incorrect formula or no acid penalise m only and mark on credit alkaline neutral kmno for possible full marks but m gives brown precipitate or solution goes green apply similar guidance for errors in the formula of iodine or concentrated sulfuric acid reagent of mark scheme a level chemistry chem june m brown as those used for other reagents of mark scheme a level chemistry chem june m any soluble chloride including hydrochloric acid ignore concentration m white precipitate or white solid white suspension m remains colourless or no reaction or no observed change or no precipitate or clear solution or it remains clear or as an alternative m any soluble iodide including hi m yellow precipitate or yellow solid yellow suspension m remains colourless or no reaction or no observed change or no precipitate or clear solution or it remains clear or as an alternative m any soluble bromide including hbr m cream precipitate or cream solid cream suspension m remains colourless or no reaction or no observed change or no precipitate or clear solution or it remains clear or as an alternative m naoh or koh or any soluble carbonate m brown precipitate or brown solid brown suspension with naoh koh white precipitate solid suspension with carbonate m remains colourless or no reaction or no observed change or no precipitate or clear solution or it remains clear c if no reagent or incorrect reagent or insoluble chloride in m ce and no marks for m m or m allow chlorine water if incomplete reagent e g chloride ions or inaccurate attempt at formula of chosen chloride or chlorine penalise m only and mark on for m require the word white and some reference to a solid ignore cloudy solution or suspension similarly for the alternatives for m ignore nothing happens ignore no observation ignore clear on its own ignore dissolves of d m any soluble sulfate including dilute or aqueous sulfuric acid m remains colourless or no reaction or no observed change or no precipitate or clear solution or it remains clear m white precipitate or white solid white suspension or as an alternative m naoh or koh m white precipitate or white solid white suspension m remains colourless or no reaction or no observed change or no precipitate or clear solution or it remains clear mark scheme a level chemistry chem june if no reagent or incorrect reagent or insoluble sulfate in m ce and no marks for m m or m accept mgso and caso but not barium lead or silver sulfates if concentrated sulfuric acid or incomplete reagent eg sulfate ions or inaccurate attempt at formula of chosen sulfate penalise m only and mark on for m or m in the alternative require the word white and some reference to a solid ignore cloudy solution or suspension for m or m in the alternative ignore nothing happens ignore no observation ignore clear on its own ignore dissolves if incomplete reagent e g hydroxide ions or inaccurate attempt at formula of chosen hydroxide penalise m only and mark on if m uses nh dilute or concentrated penalise m only and mark on of

Question 1 2 3 4 5 6 7 8 9

Topics to revise

AQA > Inorganic chemistry > Transition metals >

9 Manganate titration

AQA > Inorganic chemistry > Periodicity AS >

1 Periodicity

AQA > Organic Chemistry > Carboxylic acids and derivatives >

2 Esterification and hydrolysis of esters

AQA > Organic Chemistry > Alcohols AS >

1 Oxidation

AQA > Organic Chemistry > Organic synthesis >

1 Summary of reactions

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