5.4 Chemical Cells and Fuel Cells
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Chemical cell
Produce a voltage across the cell until one of the reactants is used up
Fuel cell
Type of chemical cell that is supplied with a fuel and oxygen and uses energy from the reaction between them to produce electricity
How is energy produced in a hydrogen-oxygen fuel cell
The reaction between hydrogen and oxygen produces energy
What type of cell uses hydrogen and oxygen
Hydrogen-oxygen fuel cell
Hydrogen-oxygen fuel cell word equation
Hydrogen + oxygen -> water
Advantages of hydrogen-oxygen fuel cells
-Enery efficient -No pollutants -Replace batteries
Disadvantages of hydrogen-oxygen fuel cells
-Hydrogen takes up lots of space to store -Difficult to store safely -Electricity for hydrogen uses fossil fuels
Explain why hydrogen-oxygen fuel cells are energy efficient
-Electricity generated directly from reaction -Not many stages so not many places for energy loss as heat -No moving parts so no energy loss due to friction
Only by-products of hydrogen-oxygen fuel cells
Water and heat
Explain why it is good that hydrogen-oxygen fuel cells could replace batteries
Batteries are difficult to dispose of as they’re made of highly toxic materials
Why does hydrogen take up lots of space to store
It is a gas
Why is hydrogen difficult to store safely
It is explosive
How is the hydrogen for hydrogen-oxygen fuel cells obtained
Electrolysis of water or from hydrocarbons