Decomposition reactions

Decomposition reactions
These are the reactions in which a single reactant breaks down to form 2 or more products by the absorbing energy in the form of light,heat and electricity.

TYPES OF DECOMPOSITION
1. Thermal decomposition reactions
2. Photo decomposition reactions
3. Electro decomposition reactions

THERMAL DECOMPOSITION REACTION
These are the chemical reactions in which this substance splits up into two or more products by the absorption of heat energy.
Activity (A)
Heating ferrous sulphate crystals in a dry test tube.
OBSERVATION 
1. The green colour of ferrous sulphate crystals first changes to White and then become brown coloured solid which is ferric oxide.
2. Gas having the smell of burning sulphur comes out of the tube due to evolution of Sulphur dioxide and sulphur trioxide gases.
Chemical equation
ACTIVITY(B)
Heating of lead nitrate in dry test tube
OBSERVATION 
1. Brown fumes of Nitrogen dioxide gas are evolved which fill the boiling test tube.
2. If a glowing splinter is held over the mouth of the test tube it catches fire and starts burning again. Shows that the oxygen is also evolved during the reaction.
3. Yellow precipitate of lead monoxide are left behind.
Equation;

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