Extraction of Zinc Flashcards
1
Q
What do we use to extract Zinc
A
Carbon (coke)
2
Q
Why dont we use electrolysis for the extraction of Zn
A
It is expensive
3
Q
Ore of zinc:
A
Zinc blende ZnS
4
Q
Zinc extraction step 1:
A
Roast the ore in air
2ZnS + 3O2 = 2ZnO + 2SO2
5
Q
Zinc extraction step 2:
A
Reduce the ZnO by carbon (coke)
ZnO + C = Zn + CO
6
Q
How is Zinc purified ?
A
Fractional distillation
7
Q
Why is zinc purified in that way?
What does it mean?
A
Because it is volatile
Low melting point
Evaporates easily
8
Q
2 uses of zinc
A
Galvanising
To make alloys
