5.4.3.3 Using Electrolysis to Extract Metals Flashcards
1
Q
How can metals be extracted from metal compounds?
A
- electrolysis
2
Q
Why is electrolysis used to extract metals?
A
- if metal is too reactive to be extracted by reduction with carbon
- if metal reacts with carbon
3
Q
What do large amounts of energy do in the extraction process?
A
- melt compounds
- produce electrical current
4
Q
What is an example of electrolysis?
A
- aluminium manufactured by electrolysis of molten mixture of aluminium oxide and cryolite using carbon as anode
5
Q
Why must the positive electrode be continually replaced?
A
- oxygen is formed
- reacts with carbon of anode
- forms carbon dioxide
- gradually burn away
6
Q
Why is a mixture used as the electrolyte?
A
- lower the melting point
- becomes less expensive
