AQA Jun 2011 Paper 1 Q6

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section b answer all questions in the spaces provided do not write outside the box a there is a risk of gas explosions in coal mines this risk is mainly due to the presence of methane if the percentage of coal mine methane cmm in the air in the mine is greater than the explosion risk is much lower cmm slowly escapes from the mine into the atmosphere write an equation to show the complete combustion of methane suggest one reason why there is a much lower risk of an explosion if the percentage of cmm is greater than state why it is beneficial to the environment to collect the cmm rather than allowing it to escape into the atmosphere marks extra space wmp jun chem do not write outside the box b methane can be obtained from crude oil some of this crude oil contains an impurity called methanethiol ch sh this impurity causes environmental problems when burned write an equation to show the complete combustion of methanethiol state why calcium oxide can be used to remove the sulfur containing product of this combustion reaction state one pollution problem that is caused by the release of this sulfur containing product into the atmosphere marks extra space turn over for the next question turn over wmp jun chem do not write outside the box pentane is a member of the alkane homologous series a give the general formula for the homologous series of alkanes mark b one of the structural isomers of pentane is dimethylpropane draw the displayed formula of dimethylpropane state the type of structural isomerism shown marks wmp jun chem

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