Fuel cells Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. Which species is oxidised in a hydrogen–oxygen fuel cell?
- A. Oxygen at the positive electrode
- B. Hydrogen at the negative electrode
- C. Water at the positive electrode
- D. Hydrogen ions at the positive electrode
2. What is the overall equation for the methanol fuel cell?
- A. CH₃OH + O₂ → CO₂ + 2H₂O
- B. CH₃OH + 2O₂ → CO₂ + 2H₂O
- C. 2CH₃OH + 2O₂ → 2CO₂ + 4H₂O
- D. 2CH₃OH + 3O₂ → 2CO₂ + 4H₂O
3. What is one advantage of a fuel cell over a conventional battery?
- A. It gives current for as long as fuel and oxygen are supplied
- B. It never needs oxygen
- C. It contains no electrolyte
- D. It stores more charge in a sealed unit
4. How many moles of electrons are transferred per mole of H₂ oxidised?
- A. 1
- B. 4
- C. 2
- D. 6
5. Why is a methanol fuel cell not free of carbon dioxide at the point of use?
- A. Methanol reacts with the electrolyte to give CO₂
- B. The methanol is oxidised to CO₂ at the anode
- C. Oxygen is reduced to CO₂
- D. Water decomposes to CO₂