Question

Give an example of the following chemical changes.

A reaction involving

     (i) Change of state

     (ii) formation of precipitate

Answer 1

(i) Change of state

    Ammonia gas reacts with HCl gas to give solid ammonium chloride.

    NH_3(g) + HCl_(g) ⇋ NH₄Cl_(s)

   (ii) Formation of precipitate

  When a solution of silver nitrate is added to a solution of sodium chloride, a white insoluble substance, silver chloride, is formed.

   AgNO_3(aq) + NaCl_(aq) → AgCl_(aq) + NaNO_3(aq)