S = Aluminium extraction Flashcards
1
Q
Half ionic equations at the anode and at the cathode.
What else is produced at the anode? Why?
A
CATHODE:
Al3+ + 3e- –> Al
ANODE:
2O2- -4e- –> O2
Forms Carbon dioxide as some of the oxygen reacts with the carbon from the graphite electrodes.
C + O2 –> CO2
2
Q
Melting point of Alumina (Al2O3)
A
2045 degrees C
3
Q
What is the electrolyte made up of
A
Al2O3 dissolved in Cryolite. There are also the impurities
4
Q
Reason for using Cryolite
A
It lowers the temperature that needs to be maintained for electrolysis from 2045 to around 945 degrees C
5
Q
Uses of Aluminium? (3)
A
- Form alloys
- Car frames and parts
- Bike frames