5.2 Chemical cells and fuel cells
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What is voltage produced by cell dependent on?
Type of electrode Electrolyte Cells contain chemicals which react to produce electricity
What is a battery?
Two or more cells connected in series to provide a greater voltage
What are the properties of non-rechargeable cells & batteries?
Chemical reactions stop when one of the reactants has been used up Alkaline batteries are non-rechargeable
What are the properties of rechargeable cells & batteries?
Can be recharged because the chemical reaction is reversible Electrical current supplied to reverse the reaction
What are the properties of fuel cells?
Supplied by external source of fuel e.g. petrol and oxygen or air Fuel oxidised electrochemically to produce a potential difference
Fill out the differences between a hydrogen fuel cell and rechargeable cells
What is the half equation at the anode in a hydrogen fuel cell?
H2(g) → 2e– + 2H+(aq)
What is the half equation at the cathode in a hydrogen fuel cell?
4H+(aq) + O2(g) + 4e– → 2H2 O(g)