Write the chemical formulae of the following.
(a) Magnesium chloride
(b) Calcium oxide
(c) Copper nitrate
(d) Aluminium chloride
(e) Calcium carbonate.

Explanation

(a)
Thus, the formula of magnesium chloride is `MgCl_(2)`.
(b) Formula of calcium oxide (made of calcium Ca and oxygen O) :

Thus, the formula of calcium oxide is `CuO`.
(c ) Formula of copper nitrate (made of copper Cu and nitrate `NO_(3)`) :

Thus, the formula of copper nitrate is `Cu(NO_(3))_(2)`.
(d) Formula of aluminium chloride
(e ) Formula of calcium carbonate (made of calcium Ca and carbonate `CO_(3)`) :

Thus, the formula of calcium carbonate is `CaCO_(3)`.