Question

Write the chemical formulae of the following :

(a ) Magnesium chloride ( b) Calcium oxide (c) Copper nitrate

(d) Aluminium chloride (e) Calcium carbonate (f) Zinc sulphate.

Answer 1

• The chemical formula of compound is formed by crossing over the valencies of elements in the compound.
• the chemical formula of

Magnesium chloride = ${\mathrm{MgCl}}_2$

Calcium oxide =$\mathrm{CaO}$

Copper nitrate =$\mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2$

Aluminium chloride =${\mathrm{AlCl}}_3$

Calcium carbonate =${\mathrm{CaCO}}_3$

Zinc sulphate .=${\mathrm{ZnSO}}_4$