AQA Jun 2010 Paper 1 Q5

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do not write outside the box the alkane butane is used as a fuel a i write an equation for the complete combustion of butane mark a ii state a condition which may cause carbon to be formed as a product in the combustion of butane mark b butane obtained from crude oil may contain trace amounts of an impurity when this impurity burns it produces a toxic gas that can be removed by reacting it with calcium oxide coated on a mesh b i suggest the identity of the toxic gas mark b ii suggest why calcium oxide reacts with the toxic gas mark b iii suggest why the calcium oxide is coated on a mesh mark turn over for the next question turn over wmp jun chem do not write outside the box pent ene is a member of the alkene homologous series a pent ene can be separated from other alkenes state the physical property of alkenes that allows them to be separated from a mixture by fractional distillation mark b i state the meaning of the term structural isomerism marks b ii name the branched chain isomer of pent ene shown below ch ch cc mark b iii draw the structure of a functional group isomer of pent ene mark wmp jun chem

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