electrolysis of aluminium oxide Flashcards
1
Q
what are metals more reactive than carbon extracted with?
A
electrolysis
2
Q
what are metals more reactive than carbon extracted with?
A
reduction with carbon
3
Q
what is aluminium oxides melting point like?
A
very high (around 2000)
4
Q
what happens in the first stage?
A
mixed with cryolite which lowers the melting point, this reduces the amount of energy needed and saves money
5
Q
what are the cathode and anode both made of?
A
graphite (carbon)
6
Q
why must the anode be replaced regularly?
A
because the oxygen molecules produced at the anode react with the graphite, forming carbon dioxide gas
