SC16 Chemical Cells and Fuel Cells
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What is a simple cell?
Source of electrical energy
What are the two types of cells ?
Chemical cells and Fuel cells
What causes chemical reactions to stop?
When one of the reactants have run out
How does reactivity play into the amount of voltage a chemical cell produces?
The greater the difference in the metals reactivity, the greater the voltage produced
What is a chemical cell?
Devices that produce a potential difference due to the reaction between reactants stored inside it
What is a fuel cell?
An electrochemical cell in which a fuel donates electrons at one electrode and oxygen gains electrons at the other electrode
What is the difference between a fuel cell and a chemical cell in terms of how long it lasts?
A fuel cell does not go flat, whereas a chemical cell does once the reactants are used up
What is the reaction that takes place inside a chemical cell?
displacement reaction
What is the reaction that takes place within a fuel cell?
Oxidation of hydrogen to produce water
What are the advantages of fuel cells?
• do not produce any pollution, only produce water • produce more energy per kg than petrol or diesel • no power lost in transmission as there are no internal parts • no bateries to dispose of • continuous process and will supply fuel as long as fuel is supplied • less noise pollution
What are the disadvantages of fuel cells?
• materials used in producing fuel cells are expensive • high pressure tanks are needed to store the oxygen and hydrogen in sufficient amounts, which are dangerous and difficult to handle • fuel cells are affected by low temps • hydrogen more expensive to produce and store