1)Name all the ores of zinc showing common names and formula
2)Give the common name of ZnCO3
3)Use an equation to show how ZnCO3 is decomposed
4)Give the common name of ZnS
5)Use an equation to show the products after roasting ZnS
6)Name two methods that can be used to obtain Zn from its oxide
7)Zinc(II)Oxide obtained is reacted with H2SO4 acid.Write an equation to show its reaction
8)What happens to the lead oxide if it might be present? Explain in terms of solubility and the method used to remove it.
9)Name the compound that undergoes through electrolysis to obtain zinc metal
1) Zinc ores:
- Sphalerite (ZnS)
- Smithsonite (ZnCO3)
- Zincite (ZnO)
2) ZnCO3 is commonly known as Zinc Carbonate.
3) Decomposition of ZnCO3:
ZnCO3 → ZnO + CO2
4) ZnS is commonly known as Zinc Sulfide.
5) Roasting ZnS:
2ZnS + 3O2 → 2ZnO + 2SO2
6) Two methods to obtain Zn from its oxide:
- Reduction with carbon
- Electrolysis
7) Reaction of Zinc(II) Oxide with H2SO4:
ZnO + H2SO4 → ZnSO4 + H2O
8) If lead oxide is present, it will form lead sulfate (PbSO4) which is insoluble in water. It can be removed by filtration.
9) The compound that undergoes electrolysis to obtain zinc metal is Zinc Sulfate (ZnSO4).