AQA Jan 2012 Paper 1 Q4

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do not write outside the box alkanes are used as fuels a student burned some octane c h in air and found that the combustion was incomplete a i write an equation for the incomplete combustion of octane to produce carbon monoxide as the only carbon containing product mark a ii suggest one reason why the combustion was incomplete mark b catalytic converters are used to remove the toxic gases no and co that are produced when alkane fuels are burned in petrol engines b i write an equation for a reaction between these two toxic gases that occurs in a catalytic converter when these gases are removed mark b ii identify a metal used as a catalyst in a catalytic converter suggest one reason other than cost why the catalyst is coated on a ceramic honeycomb metal reason marks wmp jan chem do not write outside the box c if a sample of fuel for a power station is contaminated with an organic sulfur compound a toxic gas is formed by complete combustion of this sulfur compound c i state one environmental problem that can be caused by the release of this gas mark c ii identify one substance that could be used to remove this gas suggest one reason other than cost why this substance is used substance reason why used marks turn over for the next question turn over wmp jan chem there are no questions printed on this page do not write on this page answer in the spaces provided wmp jan chem

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