Write the chemical formulae and name the element present in the calcium sulphide?
Write the chemical formulae of the following.
(a) Hydrogen sulphide
(b) Aluminium oxide
(c) Sodium nitrate
(d) Calcium hydroxide
Write chemical formulae for the following elements and compounds: hydrogen, zinc oxide, lead sulphide, iron, copper sulphate, calcium, water, calcium hydroxide, silver nitrate, carbon dioxide and mercury.