O LevelChemistryCambridgeExam Questions4. Electrochemistry4.2 Hydrogen Fuel Cells

Hydrogen Fuel Cells (Cambridge O Level Chemistry)

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4.2 Hydrogen Fuel Cells

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4.2 Hydrogen Fuel Cells

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11 mark

In a fuel cell ............1........... energy is converted to ..................2................ energy.

  1 2
A electrical heat
B chemical electrical
C potential chemical
D chemical heat

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    21 mark

    Hydrogen-oxygen fuel cells can be used to power motor vehicles.

    What is the correct balanced symbol equation for the reaction that occurs in a hydrogen-oxygen fuel cell?

    • H2O → H2 + O2

    • H2 + O2 → 2H2O

    • 2H2 + O2 → 2H2O

    • H2 + O2 → H2O

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    11 mark

    Which of the following are advantages of a hydrogen fuel cell to power a car?

    • No power is lost on transmission as there are less moving parts than in an internal combustion engine.

    • Power is lost on transmission as there are more moving parts than in an internal combustion engine.

    • They produce carbon dioxide.

    • They produce oxides of nitrogen.

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    21 mark

    What are the products made by a hydrogen-oxygen fuel cell?

    1    Water

    2    Oxygen

    3    Hydrogen 

    • 1 only

    • 1 and 2

    • 2 and 3 

    • 1, 2 and 3

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    31 mark

    These statements refer to hydrogen and its use as a fuel.

    1 Both water and hydrocarbons can be used as a source of hydrogen.
    2 In a fuel cell hydrogen reacts with oxygen to generate electricity.
    3 The reaction taking place in a fuel cell is a redox reaction.

    • 1 and 2 only 

    • 1 and 3 only

    • 2 and 3 only

    • 1, 2 and 3

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    11 mark

    What is the correct balanced symbol equation for the overall reaction in a hydrogen-oxygen fuel cell?

    • 2H2 → 4H+ + 4e–

    • 4H+ + O2 + 4e– → 2H2O

    • 2H2 + O2 → 2H2O

    • 2H2O → 2H2 + O2

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