AQA Jun 2014 Paper 1 Q5

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do not write outside the box a some oil fired heaters use paraffin as a fuel one of the compounds in paraffin is the straight chain alkane dodecane c h give the name of the substance from which paraffin is obtained state the name of the process used to obtain paraffin from this substance marks substance process b the combustion of dodecane produces several products write an equation for the incomplete combustion of dodecane to produce gaseous products only mark c oxides of nitrogen are also produced during the combustion of paraffin in air c i explain how these oxides of nitrogen are formed marks c ii write an equation to show how nitrogen monoxide in the air is converted into nitrogen dioxide mark c iii nitric acid hno contributes to acidity in rainwater deduce an equation to show how nitrogen dioxide reacts with oxygen and water to form nitric acid mark wmp jun chem do not write outside the box d dodecane c h can be cracked to form other compounds d i give the general formula for the homologous series that contains dodecane mark d ii write an equation for the cracking of one molecule of dodecane into equal amounts of two different molecules each containing the same number of carbon atoms state the empirical formula of the straight chain alkane that is formed name the catalyst used in this reaction marks equation empirical formula of alkane catalyst d iii explain why the melting point of dodecane is higher than the melting point of the straight chain alkane produced by cracking dodecane marks question continues on the next page turn over wmp jun chem do not write outside the box e give the iupac name for the following compound and state the type of structural isomerism shown by this compound and dodecane marks h c ch ch ch ch ch ch ch iupac name type of structural isomerism f dodecane can be converted into halododecanes deduce the formula of a substance that could be reacted with dodecane to produce chlorododecane and hydrogen chloride only mark wmp jun chem turn over for the next question do not write on this page answer in the spaces provided turn over wmp jun chem section b answer all questions in the spaces provided do not write outside the box a calcium phosphate reacts with aqueous nitric acid to produce phosphoric acid and calcium nitrate as shown in the equation ca po hno h po ca no a i a g sample of calcium phosphate reacted completely when added to an excess of aqueous nitric acid to form cm of solution calculate the concentration in mol dm of phosphoric acid in this solution give your answer to significant figures marks a ii calculate the percentage atom economy for the formation of calcium nitrate in this reaction give your answer to decimal place marks wmp jun chem

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