AQA Jun 2014 Paper 5 Q6

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do not write outside the box a hydrogen oxygen fuel cells are used to provide electrical energy for electric motors in vehicles in a hydrogen oxygen fuel cell a current is generated that can be used to drive an electric motor a i deduce half equations for the electrode reactions in a hydrogen oxygen fuel cell marks half equation half equation a ii use these half equations to explain how an electric current can be generated marks b explain why a fuel cell does not need to be recharged mark c to provide energy for a vehicle hydrogen can be used either in a fuel cell or in an internal combustion engine suggest the main advantage of using hydrogen in a fuel cell rather than in an internal combustion engine mark wmp jun chem d identify one major hazard associated with the use of a hydrogen oxygen fuel cell in a vehicle mark do not write outside the box turn over for the next question turn over wmp jun chem

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