⚡ The Hydrogen-Oxygen Fuel Cell
15 Questions · 23 Marks · Core & Supplement · Cambridge IGCSE Chemistry 0620
Fuel Cell Diagram — Reference
Hydrogen-oxygen fuel cell: H₂ oxidised at anode · O₂ reduced at cathode · Overall: 2H₂ + O₂ → 2H₂O
Section A: Reactants & Products
5 questions · 6 marks
Name the two gases supplied as reactants to a hydrogen-oxygen fuel cell.
State where the hydrogen gas is supplied in the fuel cell (anode or cathode).
State where the oxygen gas is supplied in the fuel cell (anode or cathode).
Name the only chemical product formed during the operation of a hydrogen-oxygen fuel cell.
Which statement correctly describes the hydrogen-oxygen fuel cell?
Section B: Energy Transfer & Advantages
5 questions · 6 marks
State the useful form of energy produced by a hydrogen-oxygen fuel cell.
Give one advantage of using a hydrogen fuel cell over a petrol engine to power a car.
Give one disadvantage of using hydrogen as a fuel in a fuel cell.
Explain why the hydrogen-oxygen fuel cell is considered more environmentally friendly than burning fossil fuels.
In a hydrogen-oxygen fuel cell, which energy conversion is taking place?
Section C: Equations & Calculations
5 questions · 11 marks
Write the balanced symbol equation, including state symbols, for the overall reaction in a hydrogen-oxygen fuel cell.
Write the half-equation for the reaction occurring at the ANODE of the hydrogen-oxygen fuel cell.
Write the half-equation for the reaction occurring at the CATHODE of the hydrogen-oxygen fuel cell.
The overall equation for the fuel cell is: 2H₂ + O₂ → 2H₂O. Calculate the volume of hydrogen gas required to react completely with 3.0 dm³ of oxygen gas (all volumes measured at the same temperature and pressure).
A student claims: 'A fuel cell and a battery are the same thing — they both produce electricity from chemicals.' Evaluate this statement. State one similarity and one difference.
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🔑 Core Equation — Never Forget
2H₂(g) + O₂(g) → 2H₂O(l)
Balanced · State symbols included · 3 marks in any exam
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