Hydrogen Fuel Cells

What is the primary reaction occurring at the cathode of the fuel cell?

• Oxygen is oxidized to form oxygen ions.

• Oxygen reacts with hydrogen ions and electrons to produce water.

• Hydrogen ions are reduced to form hydrogen gas.

• Water molecules are broken down into hydrogen and oxygen.

What is the equation for the cathode reaction in a hydrogen-oxygen fuel cell?

• H2 → 2H+ + 2e−

• O2 + 4H+ + 4e− → 2H2O

• 2H2O → 4H+ + O2 + 4e−

• H2 + O2 → H2O

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Which of the following best describes the overall reaction in a hydrogen-oxygen fuel cell?

• 2H2 + O2 → 2H2O

• 2H2O → 2H2 + O2

• H2 + O2 → H2O

• 4H+ + 4e− + O2 → 2H2O

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-7

Fill in the blank: In a hydrogen-oxygen fuel cell, the overall reaction is ______.

• 2H2 + O2 → 2H2O

• 2H2O → 2H2 + O2

• H2 + O2 → H2O

• 4H+ + 4e− + O2 → 2H2O

Fill in the blank: The cathode reaction in a hydrogen-oxygen fuel cell is ______.

• H2 → 2H+ + 2e−

• O2 + 4H+ + 4e− → 2H2O

• 2H2O → 4H+ + O2 + 4e−

• H2 + O2 → H2O

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What is the role of oxygen in the cathode reaction of a hydrogen-oxygen fuel cell?

• It is oxidized to form oxygen ions.

• It reacts with hydrogen ions and electrons to produce water.

• It is reduced to form hydrogen gas.

• It breaks down water molecules into hydrogen and oxygen.

Fill in the blank: The primary product at the cathode in a hydrogen-oxygen fuel cell is ______.

• carbon dioxide

• oxygen gas

• water

• hydrogen gas

Fill in the blank: The overall reaction in a hydrogen-oxygen fuel cell is ______.

• 2H2 + O2 → 2H2O

• 2H2O → 2H2 + O2

• H2 + O2 → H2O

• 4H+ + 4e− + O2 → 2H2O

Fill in the blank: In a hydrogen-oxygen fuel cell, hydrogen is ______ at the anode.

• reduced

• oxidized

• neutralized

• combusted

What is the primary function of the catalyst in the electrodes?

• To store hydrogen and oxygen gases.

• To accelerate the chemical reactions.

• To increase the storage capacity of the cell.

• To prevent oxidation of the electrodes.