Hydrogen–Oxygen Fuel Cells Flashcards

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What is a hydrogen–oxygen fuel cell?

It is a device that turns the reaction of hydrogen and oxygen into electricity.

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

hydrogen + oxygen → water

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

2H2 + O2 → 2H2O

How does a hydrogen–oxygen fuel cell produce a voltage?

The reaction makes electrons flow through a wire in a circuit, which gives a voltage.

In a hydrogen–oxygen fuel cell, which reactant is oxidised?

Hydrogen is oxidised because it loses electrons.

In a hydrogen–oxygen fuel cell, which reactant is reduced?

Oxygen is reduced because it gains electrons.

Why is a hydrogen–oxygen fuel cell often described as a clean energy source?

It only makes water, so it does not release carbon dioxide or other harmful gases.

Give one advantage of using hydrogen–oxygen fuel cells instead of petrol or diesel engines in vehicles.

They cause less air pollution because they do not produce carbon dioxide while the vehicle is running.

Give one disadvantage of using hydrogen–oxygen fuel cells in vehicles.

Hydrogen is hard to store and transport because it is very flammable and needs strong, high-pressure tanks.

Why might hydrogen–oxygen fuel cells not be completely carbon neutral overall?

Hydrogen is often made from fossil fuels or using electricity that itself produces carbon dioxide.

How is a hydrogen–oxygen fuel cell different from a normal chemical cell in a battery?

A fuel cell is supplied with hydrogen and oxygen from outside, so it can keep working. A normal cell uses up the chemicals stored inside it and then stops.