Decomposition Reaction

Chemistry
Concept:-Decomposition reaction

A reaction in which, a single reactant, breaks down/decomposes to form two or many products is called Decomposition Reaction.

2FeSO4(s) -heat→ Fe2O3(s) + SO2(g) + SO3(g)
(Ferrous sulphate) (Ferric oxide)
In this reaction you can observe that a single reactant breaks down
to give simpler products. This is a decomposition reaction. Ferrous
sulphate crystals (FeSO4, 7H2O) lose water when heated and the colour
of the crystals changes. It then decomposes to ferric oxide (Fe2O3),
sulphur dioxide (SO2) and sulphur trioxide (SO3).


Decomposition of calcium carbonate to calcium oxide and carbon
dioxide on heating is an important decomposition reaction used in
various industries. Calcium oxide is called lime or quick lime. It has
many uses – one is in the manufacture of cement. When a decomposition
reaction is carried out by heating, it is called thermal decomposition.

CaCO3(s) -Heat→ CaO(s) + CO2(g)




Decomposition of Silver Bromide

2AgBr(s) -Sunlight→2Ag(s) + Br2(g)

Light energy is required to decompose silver bromide. This reaction is called Photo Chemical Decomposition.
The above reactions are used in black and white photography.