C6.1.8 - Extracting aluminium Flashcards
1
Q
What ore contains aluminium oxide?
A
Bauxite
2
Q
Why is aluminium extracted with electrolysis?
A
Because it is more reactive than carbon
3
Q
What is the melting point of aluminium oxide?
A
Over 2000C
4
Q
Why is aluminium oxide dissolved in molten cryolite?
A
It has a much lower melting point and allows electrolysis to happen at about 950V
5
Q
What electrode reaction happens at the cathode during the electrolysis of aluminium?
A
Al3+ + 3e- -> Al
6
Q
What electrode reaction happens at the anode during the electrolysis of aluminium?
A
2O2- -> O2 + 4e-
7
Q
What is produced during the electrolysis of aluminium?
A
Cathode - Aluminium
Anode - Oxygen
