Hydrogen-Oxygen Fuel Cells Quiz
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5 questions, one answer each
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1. What is the only chemical product of a hydrogen-oxygen fuel cell?
- A. Carbon dioxide
- B. Water
- C. Hydrogen peroxide
- D. Oxygen
2. At which electrode in a hydrogen-oxygen fuel cell does oxidation occur?
- A. Where oxygen reacts
- B. Where hydrogen reacts
- C. At both electrodes equally
- D. Neither — no oxidation occurs in a fuel cell
3. What allows the electric current to flow through the external circuit of a fuel cell?
- A. Movement of ions through the electrolyte
- B. Movement of electrons between the electrodes
- C. Movement of hydrogen gas through the circuit
- D. Heat transfer between electrodes
4. Which of these is a genuine advantage of hydrogen fuel cell vehicles over petrol/gasoline vehicles?
- A. Hydrogen is easier to store than petrol
- B. No carbon dioxide or pollutant gases are emitted by the vehicle
- C. Fuel cells require no infrastructure at all
- D. Hydrogen fuel cells never require any energy to produce hydrogen
5. A company argues hydrogen fuel cell cars are completely 'zero emission' overall. Explain the flaw in this claim, using ideas about hydrogen production.
- A. The claim is fully correct because fuel cells only ever produce water
- B. The claim ignores that producing the hydrogen fuel often requires energy that may come from fossil fuels, creating indirect emissions
- C. The claim is wrong because fuel cells actually produce carbon dioxide directly
- D. The claim is wrong because hydrogen cannot be used as a fuel