Q2 of 38 Page 3

Write the chemical formulae of the following compounds:
a. Magnesium sulphide
b. Ferric chloride

a. The chemical formulae of Magnesium sulphide is MgS
b. The chemical formulae of Ferric chloride is FeCl3.

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1 What are the postulates of Dalton's Atomic theory? 3 What is the valency of
a. Sulphur in SO2 
b. phosphorous in P2O5 4 Write the significance of chemical formula.
  5 Explain the rules for writing a chemical equation.