AQA Jan 2010 Paper 2 Q6 (with explained solutions) |

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AQA Jan 2010 Paper 2 Q6

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consider the following scheme of reactions areas outside the box will not be scanned for marking ch ch ch propane ch ch ch cl chloropropane ch chclch chloropropane ch ch ch oh propan ol ch ch oh ch propan ol propanal propanone a state the type of structural isomerism shown by propanal and propanone mark b a chemical test can be used to distinguish between separate samples of propanal and propanone identify a suitable reagent for the test state what you would observe with propanal and with propanone test reagent observation with propanal observation with propanone marks c state the structural feature of propanal and propanone which can be identified from their infrared spectra by absorptions at approximately cm you may find it helpful to refer to table on the data sheet mark wmp jan chem areas outside the box will not be scanned for marking d the reaction of chlorine with propane is similar to the reaction of chlorine with methane d i name the type of mechanism in the reaction of chlorine with methane mark d ii write an equation for each of the following steps in the mechanism for the reaction of chlorine with propane to form l chloropropane ch ch ch cl initiation step first propagation step second propagation step a termination step to form a molecule with the empirical formula c h marks e high resolution mass spectrometry of a sample of propane indicated that it was contaminated with traces of carbon dioxide use the data in the table to show how precise mr values can be used to prove that the sample contains both of these gases atom c h o precise relative atomic mass marks turn over wmp jan chem

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part sub part a b marking guidance functional group isomerism m tollens reagent credit ammoniacal silver nitrate or a description of making tollens ignore either agno or ag nh or the silver mirror test on their own but mark m and m m silver mirror or black solid precipitate not silver precipitate m stays colourless or no change or no reaction m fehling s solution or benedict s solution ignore cu aq or cuso on their own but mark on to m and m m red solid precipitate credit orange or brown solid m stays blue or no change or no reaction chem aqa gce chemistry mark scheme january series mark comments no reagent ce allow the following alternatives m acidified potassium dichromate vi solution m turns green m stays orange no change or m acidified potassium manganate vii solution m turns colourless m stays purple no change for m ignore nothing happens ignore no observation penalise free radical mechanism mark on from an incomplete incorrect attempt at the correct reagent penalising m both have c o or a carbonyl group free radical substitution only c d ii initiation cl cl first propagation cl ch ch ch ch ch ch hcl or c h second propagation cl ch ch ch ch ch ch cl cl or c h cl termination must make c h ch ch ch c h or ch ch ch ch ch ch mr for propane mr for carbon dioxide m a correct value for both of these mr values m a statement or idea that two peaks appear in the mass spectrum or two molecular ions are seen in the mass spectrum chem aqa gce chemistry mark scheme january series penalise absence of dot once only penalise incorrect position of dot on propyl radical once only penalise c h once only accept ch ch ch with the radical dot above below to the side of the last carbon use of the secondary free radical might gain of the four marks mark independently

Question 1 2 3 4 5 6 7 8 9 10

Topics to revise

AQA > Inorganic chemistry > Transition metals >

9 Manganate titration

AQA > Organic Chemistry > NMR spectroscopy >

3 1H NMR

AQA > Organic Chemistry > Alcohols AS >

1 Oxidation

AQA > Physical chemistry > Atomic structure AS >

3 Relative Atomic and Molecular Mass

AQA > Inorganic chemistry > Periodicity AS >

1 Periodicity

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