Extraction Of Aluminium By Electrolysis Flashcards
1
Q
Why can aluminium not be electrolysed if it’s not in molten state.
A
Because the ions aren’t free to move.
2
Q
What is used to dissolve aluminium oxide?
A
Cryolite.
3
Q
Why is it difficult to melt aluminium oxide normally?
A
Because it’s melting point is very high and it would be very expensive.
4
Q
Name all the equipment required for the electrolysis of aluminium.
A
Steel case
Graphite anode
Graphite cathode
Cryolite
Aluminium oxide
5
Q
What happens once the aluminium oxide is molten?
A
It sinks to the bottom of the cell.
6
Q
What happens at the negative electrode,(cathode)?
A
Aluminium ions (Al3+) receive electrons (3e-) and are reduced to aluminium atoms (Al).
7
Q
What happens at the positive electrode?(anode)
A
The oxide ions (2O2-) lose electrons (4e-) and are oxidised to oxygen gas (O2)
