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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Hydrogen Fuel Cells (Cambridge O Level Chemistry)
Exam Questions
46 mins12 questions21 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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