5.6 Hydrogen fuel cells
5 exam questions worth 8 marks. Write your answer, open the mark scheme, then give yourself the marks you earned. Your answers are saved on this device.
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What is the only product of a hydrogen fuel cell?
Choose one answer.
Correct Not quite: the answer is Water
Mark scheme
C
Model answer
C: hydrogen and oxygen react to form water.
Give two advantages of hydrogen fuel cells compared with rechargeable batteries in cars.
Mark scheme
any two from:
- only product is water / no pollutants at the point of use (1)
- quick to refuel / no long recharging (1)
- no toxic metals to dispose of (1)
- longer range (1)
Model answer
Hydrogen fuel cells only produce water, and they can be refuelled quickly instead of being recharged for hours.
Give two disadvantages of using hydrogen as a fuel in fuel cells.
Mark scheme
any two from:
- hard to store (gas, needs high pressure) (1)
- flammable / explosive (1)
- made from fossil fuels or using electricity (1)
- few refuelling stations / expensive (1)
Model answer
Hydrogen is difficult to store because it is a gas, and it is explosive.
Higher tier.
Write the half equation for the reaction at the anode of a hydrogen fuel cell.
Mark scheme
- 2H2 → 4\mathrm{H^+} (1)
- + 4\mathrm{e^-} (1)
Model answer
2H2 → 4\mathrm{H^+} + 4\mathrm{e^-}
Explain why a fuel cell, unlike a non-rechargeable battery, does not run out.
Mark scheme
- the reactants (fuel and oxygen) are supplied continuously (1)
Model answer
Hydrogen and oxygen are fed in continuously, so the reactants are never used up.
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