1. What is the primary advantage of fuel cells over a traditional battery?

a) Fuel cells are cheaper to produce
b) Fuel cells can be recharged indefinitely
c) Fuel cells will produce electricity as long as the fuel is supplied
d) Fuel cells are smaller and more portable than batteries

2. Which of the following is a common fuel used in fuel cells:

a) Hydrogen
b) Oxygen

3. One of the main differences between batteries and fuel cells is that batteries store chemical energy but fuel cells chemical energy directly into electrical energy.

4. In a fuel cell what charge does the anode have?

a) It depends on the electrolyte used
b) No charge, it is neutral
c) Negatively charged
d) Positively charged

5. What is a common electrolyte used in fuel cells?

a) Sulfuric acid
b) Hydrochloric acid
c) Phosphoric acid
d) Nitric acid

6. The carbon anode in a fuel cell is coated with a catalyst.

7. What is the purpose of the semi-permeable membrane in a fuel cell?

a) To allow the electrons to pass through into the electrolyte
b) To store additional hydrogen fuel
c) To cool the fuel cell and prevent over heating
d) To allow ions to pass through into the electrolyte

8. What is the half-equation for the reaction taking place at the anode in a hydrogen-oxygen fuel cell?

a) O_{2 (g)} + 4H⁺_(aq) + 4e → 2H₂O_(l)
b) H_{2 (g)} → 2H⁺_(aq) + 2e⁻
c) 2H₂O_(l) → O_{2 (g)} + 4H⁺_(aq) + 4e⁻
d) 2H⁺_(aq) + 2e → H_{2 (g)}

9. Which of the following is the half-equation for the reaction taking place at the cathode in a hydrogen-oxygen fuel cell?

a) H_{2 (g)} → 2H⁺_(aq) + 2e
b) 2H⁺_(aq) + 2e → H_{2 (g)}
c) O_{2 (g)} + 4H⁺_(aq) + 4e → 2H₂O_(l)
d) 2H₂O_(l) → O_{2 (g)} + 4H⁺_(aq) + 4e

10. What is the main product formed at cathode in a hydrogen-oxygen fuel cell?

a) Carbon dioxide gas
b) Methane gas
c) Hydrogen gas
d) Water

11. In a hydrogen-oxygen fuel cell oxygen gas is at the positively charged to form water.

12. At the negatively charged anode hydrogen gas is to form hydrogen ions.

13. What is a major disadvantage of using hydrogen gas in a fuel cell?

a) It is particularly flammable
b) It requires large amounts of energy to produce it
c) It is easy to store and transport
d) It is widely available

14. What is a major environmental advantage of using hydrogen in a fuel cell?

a) It only produces carbon dioxide as the main pollutant which allows more plants to undergo photosynthesis
b) It produces sulfur dioxide gas
c) It produces oxides of nitrogen as the only pollutant
d) It only produces water as a by product

15. Why are fuel cells more expensive than batteries?

a) They use expensive catalysts
b) Batteries use simpler materials and are more easily made
c) The maintenance of fuel cells is expensive
d) They are not as efficient as batteries