Question detail
Why is the oxidation of fuel important in the operation of a fuel cell?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Chemical cells and fuel cells (chemistry only)
Question
Why is the oxidation of fuel important in the operation of a fuel cell?
Answer
The oxidation of fuel in a fuel cell is crucial because it generates a potential difference, allowing for the flow of electrons and the production of electricity. Without this oxidation reaction, the fuel cell would not function and would be unable to provide power.
Explanation
This question evaluates the student's comprehension of the role of oxidation in fuel cells. It encourages them to connect the chemical reaction to the practical outcome of electricity generation, reinforcing the importance of the oxidation process.
Common mistake
Misidentifying the Oxidation Step
Students often think the fuel (hydrogen) is reduced at the anode and the oxygen is oxidised at the cathode, confusing the direction of electron flow in a fuel cell.
In a hydrogen fuel cell, the fuel (hydrogen) is oxidised at the anode (H₂ → 2H⁺ + 2e⁻) and the oxygen is reduced at the cathode (O₂ + 4H⁺ + 4e⁻ → 2H₂O). The oxidation of hydrogen is the electrochemical reaction that generates electrons, not the reduction of oxygen.
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