1)Name the material used as cathode and anode
2)Write equations at the anode and cathode
3)In case zinc will be obtained by roasting,name the compound placed in the furnace to be reduced to zinc
4)Name the raw materials required in the furnace as reducing agent
5)Write the two equations to show how zinc oxide is reduced by carbon and carbon(II)oxide
6)Name the substance that cools hot zinc vapour from the furnace
7)Apart from cooling zinc,give the other function in the furnace
1) The material used as cathode is usually pure zinc, while the material used as anode is typically graphite.
2) Equations at the anode and cathode:
At the anode: Zn → Zn2+ + 2e-
At the cathode: Zn2+ + 2e- → Zn
3) In case zinc will be obtained by roasting, the compound placed in the furnace to be reduced to zinc is zinc oxide (ZnO).
4) The raw materials required in the furnace as reducing agent are typically carbon and/or carbon monoxide.
5) Two equations to show how zinc oxide is reduced by carbon and carbon monoxide:
ZnO(s) + C(s) → Zn(s) + CO(g)
ZnO(s) + CO(g) → Zn(s) + CO2(g)
6) The substance that cools hot zinc vapor from the furnace is typically water, which is used to condense the zinc vapor into liquid zinc.
7) Apart from cooling zinc, another function in the furnace is to provide a reducing atmosphere for the reduction of zinc oxide, ensuring the oxygen is removed and the reduction reaction can occur effectively.