Chemical Cells & Fuel Cells (Edexcel GCSE Chemistry)
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What is an electrochemical cell?
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What is an electrochemical cell?
An electrochemical cell generates electrical energy from chemical reactions.
What is an electrode?
An electrode is a conductor through which electric current enters or leaves a medium.
What is an electrolyte?
An electrolyte is a substance that dissociates into ions and conducts electricity when molten or dissolved in a solvent.
True or False?
The electrolyte used in a simple cell does not affect the voltage produced.
False.
The electrolyte used also affects the voltage as different ions react with the electrodes in different ways.
True or False?
The more reactive metal in a simple cell forms the positive electrode.
False.
The more reactive metal forms the negative electrode as it readily releases electrons.
What happens when one of the reactants in a simple cell is used up?
Cells only produce a voltage until one of the reactants is used up.
What is labelled X?
X is the the voltmeter.
True or False?
Electrons flow towards the more positive electrode in an electrochemical cell.
True.
Electrons flow to the more positive electrode in an electrochemical cell.
What is a fuel cell?
A fuel cell is an electrochemical cell in which a fuel donates electrons at one electrode and oxygen gains electrons at the other electrode.
What are the products of a hydrogen-oxygen fuel cell?
A hydrogen-oxygen fuel cell produces water and energy.
Which direction do the electrons flow in a fuel cell?
The electrons flow from anode to cathode.
True or False?
Hydrogen is pumped into the anode compartment.
True.
Hydrogen is pumped into the anode compartment pf the fuel cell.
Where is air containing oxygen pumped into a fuel cell?
The air containing oxygen is pumped into the cathode compartment.
What is the symbol equation for the reaction between hydrogen and oxygen to form water?
The symbol equation for the reaction between hydrogen and oxygen to form water is:
2H2 + O2 → 2H2O
True or False?
Using fuel cells in cars reduces noise pollution.
True.
Using fuel cells in cars reduces noise pollution.
State two disadvantages of using fuel cells.
Two disadvantages could be from the following:
Materials used in producing fuel cells are expensive
Hydrogen is difficult to store as it is flammable
Fuel cells are affected by low temperatures, becoming less efficient
Quieter so potential danger to pedestrians if used in cars and lorries
State two advantages of using fuel cells.
Two advantages could be from the following:
The only product is water so less pollution
They produce more energy per kilogram than either petrol or diesel
No power is lost in transmission as there are no moving parts
No batteries to dispose of which is better for the environment
Continuous process and will keep producing energy as long as fuel is supplied
Quieter so less noise pollution
