Question detail
During aluminium extraction, what happens to the carbon anode as the electrolysis proceeds and why does this affect the process?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Electrolysis
Question
During aluminium extraction, what happens to the carbon anode as the electrolysis proceeds and why does this affect the process?
Answer
The carbon anode is oxidised to carbon dioxide by the oxygen produced from the oxidation of oxide ions, which gradually reduces the mass of the anode. This loss of material means the anode must be replaced regularly, increasing the cost and operational complexity of the process.
Explanation
This question checks the ability to explain the chemical change at the anode and its practical implications, requiring application of knowledge about oxidation and electrode consumption.
Common mistake
Misunderstanding Anode Consumption
Students often think that carbon anodes are used up because they react with the aluminium being extracted, rather than understanding that they are consumed by reacting with oxygen produced during the electrolysis process.
Emphasize that carbon anodes are gradually used up due to the reaction with oxygen, forming carbon dioxide, rather than being consumed by the aluminium itself.
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