3 Calculating Electromotive Force

 

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Oxford Textbook Pages : 306 - 309

CGP Revision Guide Pages : 78 - 79

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Show Specification Ref : 3.1.11.1

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Question 1 / 3

AQA Jan 2011 Paper 2 Q4 do not write outside the box a pure manganese is extracted from the ore pyrolusite mno by reduction using carbon monoxide write an equation for the reduction of mno to manganese using carbon monoxide mark b impure manganese is extracted by reduction of mn o using powdered aluminium according to the following equation mn o al mn al o deduce the redox half equation for aluminium in this extraction process mark c copper can be extracted by the high temperature carbon reduction of copper ii oxide write an equation for this reaction mark d scrap iron is used in a low cost process to extract copper from aqueous solutions containing copper ii ions d i give one reason other than the cost of scrap iron why this method is low cost mark d ii write the simplest ionic equation for the reaction of iron with copper ii ions in aqueous solution mark turn over wmp jan chem
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Question 2 / 3

AQA Jan 2013 Paper 5 Q7 section b do not write outside the box answer all questions in the spaces provided this table shows some standard electrode potential data electrode half equation au aq e au s o g h aq e h o l ag aq e ag s fe aq e fe aq cu aq e cu s fe aq e fe s e v a draw a labelled diagram of the apparatus that could be connected to a standard hydrogen electrode in order to measure the standard electrode potential of the fe fe electrode in your diagram show how this electrode is connected to the standard hydrogen electrode and to a voltmeter do not draw the standard hydrogen electrode state the conditions under which this cell should be operated in order to measure the standard electrode potential conditions marks wmp jan chem do not write outside the box b use data from the table to deduce the equation for the overall cell reaction of a cell that has an e m f of v give the conventional cell representation for this cell identify the positive electrode marks c use data from the table to explain why au ions are not normally found in aqueous solution write an equation to show how au ions would react with water marks d use data from the table to predict and explain the redox reactions that occur when iron powder is added to an excess of aqueous silver nitrate marks turn over for the next question turn over wmp jan chem
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Question 3 / 3

AQA Jun 2016 Paper 5 Q4 do not write outside the box table shows some standard electrode potential data table electrode half reaction zn aq e zn s co aq e co s o g h aq e h o l au aq e au s co aq e co aq e v a i identify the weakest oxidising agent in table mark a ii give the conditions under which the electrode potential of the zn zn electrode is v marks b two half cells involving species in table are connected together to give a cell with an e m f v use data from table to deduce the conventional representation of this cell write the half equation for the reaction that occurs at the negative electrode marks conventional representation half equation wmp jun chem c use data from table to identify a cobalt species that can react with water do not write outside the box write an equation for the redox reaction that occurs and identify the oxidation product in the reaction marks cobalt species equation oxidation product d use data from table to explain why gold jewellery is unreactive in moist air marks turn over for the next question turn over wmp jun chem
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