AQA Jan 2012 Paper 5 Q4 (with explained solutions) |

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AQA Jan 2012 Paper 5 Q4

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do not write outside the box the diagram below shows a cell that can be used to measure the standard electrode potential for the half reaction fe aq e fe aq in this cell the electrode on the right hand side is positive h g fe so aq feso aq a identify solution a and give its concentration state the other essential conditions for the operation of the standard electrode that forms the left hand side of the cell solution a conditions marks b identify the material from which electrodes b are made give two reasons why this material is suitable for its purpose material reason reason marks wmp jan chem do not write outside the box c identify a solution that could be used in c to complete the circuit give two reasons why this solution is suitable for its purpose solution reason reason marks d write the conventional representation for this cell mark e the voltmeter v shown in the diagram of the cell was replaced by an ammeter e i write an equation for the overall cell reaction that would occur mark e ii explain why the ammeter reading would fall to zero after a time mark turn over wmp jan chem

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mark scheme general certificate of education a level chemistry unit energetics redox and inorganic chemistry january marking guidance mark comments question a hcl mol dm hydrogen at kpa bar k allow h so mol dm allow hno mol dm allow name or formula concentration can be given after conditions mark on if no answer for m if wrong answer for m only mark on if electrode is au ag pb or ti allow nacl kno na so etc not nh cl allow unreactive inert allow conducts electricity electrical connection carries charge do not allow just connects completes the circuit do not allow conducts carries electrons mark these independently b c pt platinum inert unreactive does not create a potential difference conducts electricity allows electron flow conducts conductor kcl does not react with either electrode solution in electrode ions can move mark scheme general certificate of education a level chemistry unit energetics redox and inorganic chemistry january d pt h h fe fe pt e i fe h fe h e ii the fe ions would be used up reaction completed ignore state symbols order must be correct must be correct but allow instead of separating fe from fe allow instead of separating h and h allow multiples answer must relate to reactants in e i equation if given allow reactant reactants used up do not allow concentration of fe decreases allow concentration of fe falls to zero

Question 1 2 3 4 5 6 7 8

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