AQA Jan 2011 Paper 2 Q3 (with explained solutions) |

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AQA Jan 2011 Paper 2 Q3

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do not write outside the box the following pairs of compounds can be distinguished by observing what happens in test tube reactions for each pair give a suitable aqueous reagent that could be added separately to each compound describe what you would observe in each case a naf aq and nacl aq reagent observation with naf aq observation with nacl aq marks b bacl aq and mgcl aq reagent observation with bacl aq observation with mgcl aq marks c agcl s and agi s reagent observation with agcl s observation with agi s marks d butan ol l and methylpropan ol l reagent observation with butan ol l observation with methylpropan ol l marks wmp jan chem

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question a mark scheme general certificate of education a level chemistry unit chemistry in action january marking guidance m agno or silver nitrate or any soluble silver salt m remains colourless or no reaction or no observed change or no precipitate m white precipitate or white solid white suspension mark comments an insoluble silver salt or tollens or ammoniacal silver nitrate or hcl agno is 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 if no reagent or incorrect reagent in m then no marks for m or m for m ignore nothing ignore no observation ignore clear ignore dissolves for m ignore cloudy solution or suspension b mark scheme general certificate of education a level chemistry unit chemistry in action january m any soluble sulfate by name or formula e g sodium sulfate or sulfuric acid m white precipitate or white solid white suspension m remains colourless or no reaction or no observed change or no precipitate or as an alternative m naoh koh m remains colourless or no reaction or no observed change m white precipitate or white solid white suspension an insoluble sulfate or conc h so is ce for the clip if no reagent or incorrect reagent in m then no marks for m or m for the m soluble sulfate if sulfate ions or incorrect formula for the chosen sulfate penalise m but mark m and m for the m naoh koh if ammonia then ce if hydroxide ions or incorrect formula for the chosen hydroxide penalise m but mark m and m for no observed change in both alternatives ignore nothing ignore no observation ignore clear ignore dissolves for the white precipitate in both alternatives ignore cloudy solution or suspension c mark scheme general certificate of education a level chemistry unit chemistry in action january m ammonia can be dilute or concentrated m dissolves or soluble or forms a colourless solution or goes colourless m does not dissolve or not soluble or remains as a solid or no observed change or no reaction or yellow solid remains or if concentrated ammonia has been used accept yellow solid turns white or as an alternative using conc sulfuric acid m concentrated sulfuric acid or c onc h so m misty white fumes gas or remains white or no change in colour m turns black solid or purple fumes gas or correct reference to h s observation e g bad egg smell for m if incorrect formula or ammonium penalise m but mark m and m if no reagent or incorrect reagent in m then no marks for m or m for m ignore nothing ignore no observation for the alternative using sulfuric acid if dilute sulfuric acid or aq alone or the idea of concentrated not included ce if incorrect formula penalise m but mark m and m if no reagent or incorrect reagent in m then no marks for m or m mark scheme general certificate of education a level chemistry unit chemistry in action january d 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 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 if no reagent or incorrect reagent in m then no marks for m or m for m if dichromate or dichromate iv or incorrect formula or no acid penalise m but mark m and m for m ignore dichromate described as yellow or red for m ignore nothing ignore no observation for m if manganate or manganate iv or incorrect formula or no acid penalise m but mark m and m credit alkaline kmno for possible full marks but m gives brown precipitate or solution goes green

Question 1 2 3 4 5 6 7 8 9 10

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 > Inorganic chemistry > Group 7 AS >

4 Reaction of halide salts with concentrated sulfuric acid

AQA > Organic Chemistry > Alcohols AS >

1 Oxidation

AQA > Organic Chemistry > Carboxylic acids and derivatives >

2 Esterification and hydrolysis of esters

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