O LevelChemistryCambridge (CIE)Exam Questions4. Electrochemistry4.2 Hydrogen Fuel Cells

Hydrogen Fuel Cells (Cambridge (CIE) O Level Chemistry): Exam Questions

Exam code: 5070

47 mins13 questions

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4.2 Hydrogen Fuel Cells

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1
1 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

    Choose your answer

    2
    1 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

    Choose your answer

    3
    1 mark

    Three statements comparing gasoline (petrol) combustion engines with hydrogen-oxygen fuel cells are shown

    1. The combustion of gasoline and the formation of water are both exothermic processes with a positive enthalpy change, ΔH.

    2. Combustion engines are more polluting than fuel cells because incomplete combustion produces carbon monoxide and particulates.

    3. Gasoline is more difficult and expensive to store in a vehicle than hydrogen.

    Which statements are correct?

    • 1 and 2

    • 2 only

    • 2 and 3

    • 1, 2 and 3

    Choose your answer

    1
    1 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.

    Choose your answer

    2
    1 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

    Choose your answer

    3
    1 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

    Choose your answer

    1
    1 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

    Choose your answer