AQA Jun 2014 Paper 2 Q5

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do not write outside the box trifluoromethane chf can be used to make the refrigerant chlorotrifluoromethane cclf a chlorotrifluoromethane is formed when trifluoromethane reacts with chlorine chf cl cclf hcl the reaction is a free radical substitution reaction similar to the reaction of methane with chlorine a i write an equation for each of the following steps in the mechanism for the reaction of chf with cl marks initiation step first propagation step second propagation step termination step to form hexafluoroethane a ii give one essential condition for this reaction mark wmp jun chem do not write outside the box b in some refrigeration systems chf has replaced cclf because of concerns about ozone depletion b i identify the species formed from cclf that is responsible for the catalytic decomposition of ozone in the upper atmosphere mark b ii write an overall equation to represent the decomposition of ozone into oxygen mark turn over for the next question turn over wmp jun chem there are no questions printed on this page do not write on this page answer in the spaces provided wmp jun chem

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