AQA Jun 2016 Paper 5 Q7 (with explained solutions) |

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AQA Jun 2016 Paper 5 Q7

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the following scheme shows some reactions of chromium compounds do not write outside the box reaction reaction crcl s cr h o aq p s green solid reaction reaction reaction cr h o aq q g p s r aq green solution a write an equation for reaction mark b for reaction identify the complex p state a reagent and write an equation marks identity of p reagent equation c for reaction identify q state a reagent and write an equation marks identity of q reagent equation wmp jun chem do not write outside the box d for reaction identify the complex r state a reagent and write an equation for the formation of r from p marks identity of r reagent equation e for reaction suggest the reagents and state the colour of cr h o aq marks reagents colour turn over for the next question turn over wmp jun chem

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question a b marking guidance crcl h o cr h o cl m p cr oh h o m naoh not excess or nh or names m cr h o oh cr oh h o h o cr h o nh cr oh h o nh mark mark scheme a level chemistry chem june comments ignore state symbols ignore state symbols penalise charges on ligands in complex ion formulae do not transfer m from equation allow koh do not allow oh excess naoh but mark on equations must match reagent but if nh then also allow two equations nh h o nh cr h o oh cr oh h o h o oh do not allow cr oh as identity of p or in equation of c m q co m na co or nahco or k co m cr h o co cr oh h o co h o mark scheme a level chemistry chem june ignore state symbols penalise charges on ligands in complex ion formulae do not allow incorrect formulae or co do not allow insoluble carbonates or h co but mark on do not allow equations that give cr oh allow cr h o hco but mark on cr oh h o co h o of d either m r cr oh m naoh or koh m cr oh h o oh cr oh h o or m r cr h o m hcl or any named acid m cr oh h o h cr h o mark scheme a level chemistry chem june ignore state symbols penalise charges on ligands in complex ion formulae allow r cr oh h o or cr oh h o do not allow oh but mark on ignore excess conc allow equations to form cr oh h o and cr oh h o do not allow equations from cr oh or allow r cr h o oh or cr h o oh do not allow h etc but mark on allow equations to form cr h o oh or cr h o oh or cr h o cl or cr h o cl but not cr h o cl do not allow equations from cr oh e zn hcl sn hcl etc blue allow h so instead of hcl ignore h mark independently of

Question 1 2 3 4 5 6 7 8 9

Topics to revise

AQA > Organic Chemistry > Carboxylic acids and derivatives >

2 Esterification and hydrolysis of esters

AQA > Physical chemistry > Atomic structure AS >

4 Electronic arrangement

AQA > Organic Chemistry > Aromatic chemistry >

2 Electrophilic substitution

AQA > Physical chemistry > Thermodynamics >

5 Gibb’s Free Energy

AQA > Inorganic chemistry > Periodicity AS >

1 Periodicity

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