AQA Jan 2010 Paper 2 Q1 (with explained solutions) |

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AQA Jan 2010 Paper 2 Q1

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section a answer all questions in the spaces provided areas outside the box will not be scanned for marking hydrogen gas is used in the chemical industry a tungsten is extracted by passing hydrogen over heated tungsten oxide wo a i state the role of the hydrogen in this reaction mark a ii write an equation for this reaction mark a iii state one risk of using hydrogen gas in metal extractions mark b hydrogen is used to convert oleic acid into stearic acid as shown by the following equation ch ch ch ch ch cooh h c catalyst ch ch cooh oleic acid stearic acid b i use your knowledge of the chemistry of alkenes to deduce the type of reaction that has occurred in this conversion mark b ii state the type of stereoisomerism shown by oleic acid mark wmp jan chem c hydrogen reacts with nitrogen in the haber process the equation for the equilibrium that is established is shown below areas outside the box will not be scanned for marking n g h g nh g c i state le chatelier s principle mark c ii use le chatelier s principle to explain why an increase in the total pressure of this equilibrium results in an increase in the equilibrium yield of ammonia marks d hydrogen reacts with oxygen in an exothermic reaction as shown by the following equation h g o g h o g h kj mol use the information in the equation and the data in the following table to calculate a value for the bond enthalpy of the h h bond mean bond enthalpy kj mol o h o o marks extra space turn over wmp jan chem

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part sub part i a a ii iii ii chem aqa gce chemistry mark scheme january series mark comments or multiples ignore reference to pressure or temperature ignore electrophilic penalise nucleophilic addition a variety of wording will be seen here and the key part is the last phrase and must refer to movement of the equilibrium qol marking guidance reducing agent or reduce s wo tungsten oxide or electron donor or to remove oxygen from wo tungsten oxide or to form water wo h w h o one from h is explosive easily ignited flammable or inflammable addition or catalytic hydrogenation or reduction geometric al or cis trans or e z or e z if any factor is changed which affects an equilibrium the position of equilibrium will shift move change respond act so as to oppose the change or when a system reaction in equilibrium is disturbed the equilibrium shifts moves in a direction which tends to reduce the disturbance ii m statement of number of moles molecules there are more moles molecules of gas on the left of reactants or fewer moles molecules of gas on the right products or there are moles molecules of gas on the left and moles molecules on the right m explanation of response movement in terms of pressure increase in pressure is opposed or words to that effect or pressure is lowered by a shift in the equilibrium from left to right favours forward reaction b reactants b products h m or sum of bonds broken sum of bonds formed h m b h h b o o b o h m b h h this scores m and m b h h kj mol m award mark for candidates may use a cycle and gain full marks chem aqa gce chemistry mark scheme january series ignore volumes for m mark independently m could stand alone award full marks for correct answer ignore units two marks can score with an arithmetic error in the working

Question 1 2 3 4 5 6 7 8 9 10

Topics to revise

AQA > Physical chemistry > Equilibrium AS >

1 Dynamic equilibrium and factors affecting equilibrium

AQA > Organic Chemistry > Optical isomerism >

1 Optical isomerism

AQA > Physical chemistry > Thermodynamics >

5 Gibb’s Free Energy

AQA > Physical chemistry > Atomic structure AS >

4 Electronic arrangement

AQA > Physical chemistry > Energetics and kinetics AS >

5 Kinetics

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