AQA Jun 2016 Paper 5 Q4

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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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