AQA Jan 2010 Paper 2 Q8

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areas outside the box will not be scanned for marking copper is extracted from the ore chalcopyrite cufes in a three stage process a in the first stage of this extraction the chalcopyrite is heated with silicon dioxide and oxygen a i balance the following equation for this first stage in which copper i sulfide is formed cufes sio o cu s fesio so mark a ii give one environmental reason why the so gas formed in this reaction is not allowed to escape into the atmosphere mark a iii state one use for the sulfur dioxide formed in this reaction mark b in the second stage of this extraction the copper i sulfide is converted into copper ii oxide this occurs by roasting the sulfide with oxygen at high temperature write an equation for this reaction mark c in the third stage of this extraction copper ii oxide is reduced to copper by its reaction with carbon write an equation for this reaction mark wmp jan chem areas outside the box will not be scanned for marking d scrap iron can be used to extract copper from dilute aqueous solutions containing copper ii ions d i explain why this is a low cost method of extracting copper mark d ii write the simplest ionic equation for the reaction of iron with copper ii ions in aqueous solution mark turn over for the next question turn over wmp jan chem

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