AQA Jun 2016 Paper 2 Q7

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do not write outside the box a the ores used for the extraction of many metals contain metal sulfides or metal oxides various methods are used to extract metals from these ores sulfide ores such as zinc blende zns are crushed and then roasted in a stream of air to convert them into the metal oxide a i write an equation for the reaction that takes place when zns is roasted in air mark a ii state a useful substance that can be manufactured from the gaseous product of this reaction mark b zinc oxide is reduced by carbon monoxide in the extraction of zinc the carbon monoxide is produced by the incomplete combustion of methane b i write an equation for the production of carbon monoxide by the incomplete combustion of methane mark b ii write an equation for the reaction between zinc oxide and carbon monoxide mark c most copper is produced by reduction of copper ii oxide with carbon the copper ii oxide is produced by roasting chalcopyrite cufes in air copper can also be obtained from other low grade ores when these low grade ores are processed aqueous solutions containing low concentrations of cu ions are produced scrap iron is used to recover copper from these solutions c i give the ionic equation for the reaction involved in the recovery of solid copper from an aqueous solution using scrap iron include state symbols mark turn over wmp jun chem do not write outside the box c ii suggest two environmental reasons and one economic reason why the extraction of copper from solutions containing cu ions using iron is preferable to the reduction of copper ii oxide made by roasting chalcopyrite marks environmental reason environmental reason economic reason d titanium can be extracted from its ore rutile tio in a two step process using carbon chlorine and magnesium extraction of titanium is not possible by direct reduction of tio with carbon d i give equations for the two step process using carbon chlorine and magnesium marks step step d ii state why direct reduction of tio with carbon cannot be used mark wmp jun chem do not write outside the box turn over for the next question do not write on this page answer in the spaces provided turn over wmp jun chem

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