Sc16. Fuel Cells

What are the reactants in a fuel cell?

• Water and oxygen

• Hydrogen and water

• Oxygen and hydrogen

• Carbon dioxide

What is the product from a fuel cell?

• Water

• Hydrogen

• Oxygen

• Carbon dioxide

Which is NOT an advantage of fuel cells?

• No harmful emissions.

• Keep producing electric if the fuel keeps being supplied.

• Faster refuelling than electric cars.

• Currently cheap to make.

Which is NOT a disadvantage of fuel cells?

• Difficult to transport hydrogen.

• Difficult to store hydrogen.

• Create harmful emissions.

• Expensive to make.

What is the word equation for the reaction in a hydrogen fuel cell?

• Hydrogen + Oxygen = Electric

• Hydrogen + Oxygen = Water

• Hydrogen + Water = Oxygen

• Water + Hydrogen = Electric

What is the balanced symbol equation for the reaction in a hydrogen fuel cell?

• H₂ + O₂ = H₂O

• None of these

• 2H + O = H₂O

• 2H₂ + O₂ = 2H₂O

What is the half equation for the reaction at the anode (left hand side) in a hydrogen fuel cell?

• 2H₂(l) = 4e^- + 4H⁺ (aq)

• 2H₂ = 4e^- + 4H⁺

• 2H₂ (g) = 4e^- + 4H⁺ (g)

• 2H₂ (g) = 4e^- + 4H⁺ (aq)

What is the half equation for the reaction at the cathode in a hydrogen fuel cell?

• 4H⁺ (aq) + O_{2 (g)} + 4e^- = 2H₂O (l)

• 2H⁺ (aq) + O₂ (g) + e^- = H₂O (g)

• H⁺ + O₂(g) + 4e^- = H₂O (g)

• None of these