Fuel Cells

Question 1

What is most of the energy released transferred by?

Answer 1

Electricity.

Question 2

What is supplied to the negative electrode?

Answer 2

Hydrogen gas.

Question 3

What is the half equation at the negative electrode?

Answer 3

2H2 + 4OH- = 4H2O + 4e-

Question 4

What is the half equation at the positive electrode?

Answer 4

02 + 2H2O + 4e- = 4OH-

Question 5

What is the overall equation?

Answer 5

2H2 + O2 = 2H2O

Question 6

What is supplied to the positive electrode?

Answer 6

Oxygen gas.

Question 7

What is an advantage of using hydrogen as a fuel?

Answer 7

The reaction does not produce carbon dioxide.

Question 8

What happens at the negative electrode?

Answer 8

Hydrogen diffuses through the electrode and reacts with hydroxide ions to form water. It provides a source of electrons to an external circuit.

Question 9

What happens at the positive electrode?

Answer 9

Oxygen diffuses through the electrode and reacts with water to form hydroxide ions, accepting electrons from the external circuit.

Question 10

What are the advantages of hydrogen fuel cells?

Answer 10

• Do not need to be electrically recharged

- No pollutants are produced

Question 11

What are the disadvantages of hydrogen fuel cells?

Answer 11

• Hydrogen is highly flammable

- Hydrogen is sometimes produced for the cell by non-renewable sources.

Question 12

What is the only waste product of hydrogen fuel cells?

Answer 12

Water.