12. A. 2 g of ferrous sulphate crystals 5 points are heated in a dry boiling tube. a)
Name and define the type of reaction
that has taken place. b) Write
balanced chemical equation for the
above reaction. c) List two main
observations of this reaction. B. A
shining metal 'M'on burning gives a
dazzling white flame and changes to
a white powder ‘N’. a) Identify ‘M'and
'N'. b) Name the type of reaction
taking place and write the balanced
chemical equation.

A) Decomposition reaction.

Decomposition reaction is defined as a chemical reaction whereby a compound is broken down into 2 or more simpler substances.

B) 2FeSO4 + Heat > Fe2O3 + SO2 + SO3

C) - Gas evolution because a gas is part of the product

- Upon heating its colour gradually changes from pale green to reddish brown which implies a change in state

Explanation:

A) Name of the reaction is; Decomposition reaction.

Decomposition reaction is defined as a chemical reaction whereby a compound is broken down into 2 or more simpler substances.

B) The balanced chemical equation is;

2FeSO4 + Heat > Fe2O3 + SO2 + SO3

C) From experience, the 2 main observations of this reaction are;

- Gas evolution because a gas is part of the product

- Upon heating its colour gradually changes from pale green to reddish brown which implies a change in state.

1. they vary with a higher number because boiling is way hotter than melting