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Types of Chemical Reaction

There are total five types of chemical reaction.

  1. Synthesis
  2. Combustion
  3. Decomposition
  4. Single displacement
  5. Double displacement

Synthesis:
Synthesis means one or two simpler compound reacts to form a more complicated compound. In short two simple reactants reacts to form a complex product is called as synthesis.

Example: Hydrogen reacts with oxygen to form water and with chloride to form hydrochloric acid


2H2 + O2 2H2O
2H
2 + Cl2
2HCl

Combustion:
Combustion is a process where oxygen reacts with compound to form water and carbon dioxide. In this reaction heat is generated so it is called as exothermic reaction.

Example: Methane reacts with oxygen to form carbon dioxide and water.


CH4 + 2O2 CO2 + 2H2O

Decomposition:
Decomposition means a complex molecule breaks down in a single compound where energy is required to break the molecule so it is called as endothermic reaction.

Example: Water is break down into hydrogen and oxygen molecules

2 H2O 2H2 + O2 

Single displacement:
Single displacement means one element replaces by another in a compound.

Example: zinc reacts with hydrochloric acid to form zinc chloride

Zn + 2HCl
ZnCl2 + H2

Double displacement:
Double displacement means two different molecules switch places to form two entirely different compounds.

Example: Silver nitrate combines with sodium chloride to form silver chloride and sodium nitrate


AgNO3 + NaCl AgCl + NaNO3
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