three types of decomposition reaction with examples
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Decomposition reaction
A reaction in which a single reactant breaks down to form two or more products, is known as decomposition reaction.
This reaction is opposite to combination reaction. On the basis of form of energy required for the reaction, these reactions are of three types:
1. Thermal decomposition: These reactions use the energy in the form of heat for decomposition of the reactant, e.g.
Calcium carbonate on heating decomposes to give calcium oxide and carbon dioxide. Calcium oxide is used for manufacturing of cement.
CaCO3 (s) ------ CaO (s) + CO2 (g)
2. Electrolysis
These reactions involve the use of electrical energy for the decomposition of reactant molecules, e.g.
When electric current is passed through water, it decomposes to give Oxygen and hydrogen
2H2O (l) ---------- 2H2 (g) + O2 (g)
3. Photolysis or photochemical decomposition
These reactions involve the use of light energy for the purpose of decomposition, e.g.
When silver chloride is exposed to light, it decomposes to give silver metal and chlorine gas.
2AgCl (s) -------- 2Ag (s) + Cl2 (g)
A reaction in which a single reactant breaks down to form two or more products, is known as decomposition reaction.
This reaction is opposite to combination reaction. On the basis of form of energy required for the reaction, these reactions are of three types:
1. Thermal decomposition: These reactions use the energy in the form of heat for decomposition of the reactant, e.g.
Calcium carbonate on heating decomposes to give calcium oxide and carbon dioxide. Calcium oxide is used for manufacturing of cement.
CaCO3 (s) ------ CaO (s) + CO2 (g)
2. Electrolysis
These reactions involve the use of electrical energy for the decomposition of reactant molecules, e.g.
When electric current is passed through water, it decomposes to give Oxygen and hydrogen
2H2O (l) ---------- 2H2 (g) + O2 (g)
3. Photolysis or photochemical decomposition
These reactions involve the use of light energy for the purpose of decomposition, e.g.
When silver chloride is exposed to light, it decomposes to give silver metal and chlorine gas.
2AgCl (s) -------- 2Ag (s) + Cl2 (g)
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