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Fuel Cells and Hydrogen Technology

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Questions and Answers

What is the reactant that is oxidised electrochemically within a fuel cell?

Hydrogen (correct)

Electrolyte

Alkaline

Oxygen

What is the product formed in the overall reaction of a hydrogen fuel cell?

Alkaline

Oxygen

Hydrogen peroxide

Water (correct)

What is the purpose of connecting cells together in series in a battery?

To decrease the reaction rate

To change the type of electrode

To reduce the voltage

To increase the voltage (correct)

Why do chemical reactions stop in non-rechargeable cells and batteries?

One of the reactants has been used up Signup and view all the answers

What is required to reverse the chemical reactions in rechargeable cells and batteries?

Supplying an external electrical current Signup and view all the answers

What type of battery is non-rechargeable?

Alkaline Signup and view all the answers

Study Notes

Fuel Cells

Fuel cells are supplied by an external source of fuel (e.g. hydrogen) and oxygen or air
Fuel is oxidised electrochemically within the fuel cell to produce a potential difference
Hydrogen fuel cells involve the oxidation of hydrogen to produce water as the overall reaction

Cells

Cells contain chemicals that react to produce electricity
Voltage produced by a cell depends on factors such as electrode and electrolyte type
A simple cell can be made by connecting two different metals in contact with an electrolyte

Batteries

Batteries consist of two or more cells connected together in series to provide a greater voltage
Non-rechargeable cells and batteries: chemical reactions stop when one of the reactants is used up
Alkaline batteries are non-rechargeable
Rechargeable cells and batteries: chemical reactions are reversed when an external electrical current is supplied

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Description

This quiz covers the basics of fuel cells, including how they work, the oxidation of hydrogen, and their potential as an alternative to traditional batteries. Learn about the chemistry behind fuel cells and how they produce electricity.