Aluminium can be manufactured from the electrolysis of a molten mixture of aluminium oxide and cryolite. In this process, which electrode must be continually replaced?
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The use of cryolite reduces some of the energy costs involved in extracting aluminium. The diagram shows an aluminium oxide electrolysis cell. The negative electrodes (cathodes ) and the positive electrodes (anodes ) are made of graphite, a form of carbon.
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Answer: Anode
Explanation: The carbon anode reacts with the oxygen produced to make carbon dioxide. This means that the electrode corrodes over time and needs to be replaced.
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