More Chemistry ;( 0.0 / 5 ? ChemistryArenesA2/A-levelAQA Created by: jatyizationCreated on: 07-05-15 14:24 Describe what you would observe when Magnesium is heated strongly with water vapour White powder; Bright white flame 1 of 7 Explain how an electric current can be generated in a hydrogen-oxygen fuel cell Hydrogen electrode produces electrons; Oxygen electrode accepts electrons 2 of 7 Explain why a fuel cell does not have to be recharged Reactants supplied continuously 3 of 7 Suggest the main advantage of hydrogen in a fuel cell rather than in an internal combustion engine In the fuel cell, a greater proportion of the energy available from the hydrogen–oxygen reaction is converted into useful energy 4 of 7 Why are complexes of the same species different colours? Same oxidation state; Same electron configuration; Different energy split in d-electron energy levels; Ligands are different 5 of 7 Name the a commonly used salt bridge KNO3 (potassium nitrate) 6 of 7 What is the function of the salt bridge? Allows ions to be transferred and keeps charges balanced 7 of 7
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