Question

2g of ferrous sulphate crystals are heated in a dry boiling tube.
a) list any two observations.
b) name the type of chemical reaction taking place.
c) write a balanced chemical equation for the reaction taking place.

Answer 1

Answer:

a)1-change in colour of ferrous sulphate

2-a gas is released

b) decomposition reaction

c)2FeSO4=Fe2O3+SO2+SO3

Answer 2

Answer:

(i) Before heating, it is pale green. 

After heating, it is brown or reddish brown.

Two observations are :

(a) Change in state and colour.

(b) Evolution of gas.

(ii) Decomposition reaction.

(iii) 2FeSO4(s) +Heat → Fe2O3(s) + SO2(g) + SO3(g)