Question

2g of ferrous sulphate crystals are heated in a dry boiling tube.
(i) List any two observations.
(ii) Name the type of chemical reaction taking place.
(iii) Write the chemical equation for the reaction.

Answer 1

(i) As ferrous sulphate crystals are heated, the following two observations occur:

(a) Green colour of FeSO₄ disappears which means a change in state and colour occurs.

(b) The reddish brown solid is formed and gas is generated during this process.
(ii) It is a decomposition reaction since the compound (ferrous sulphate) decomposes into two or more substances.

(iii) The following is the chemical reaction equation.

2FeSO₄(s)+Heat(Δ)⟶Fe₂O₃(s)+SO₂(g)+SO₃(g)