Types of Chemical Reactions

Pranabjyoti Das Tangla

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The transformation of chemical substance into another chemical substance is known as Chemical Reaction. For example: rusting of iron, setting of milk into curd, digestion of

food, respiration, etc.

In chemical reaction new substance is formed which is completely different in

properties from the original substance, so in a chemical reaction chemical change takes

place.

What is a Chemical Reaction ?

A chemical reaction is a process that leads to the transformation of one set of chemical substances to

another with completely new properties.

For example:

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Types of Chemical reactions:

There are five basic types of chemical reactions. They are:

1. Combination reaction or Synthesis Reaction2. Decomposition Reaction3. Displacement Reaction or Replacement Reaction4. Double displacement Reaction5. Oxidation & Reduction Reactions or Redox Reactions


In a synthesis or Combination reaction two or more simple substances combine to form a more

complex substance.

These reactions are in the general form of

A + B = ABOne example of such a reaction is the

combination of Hydrogen and Oxygen to form Water.

2H2 + O2 2H⇨ 2O


One More example :

Sodium reacts with Chlorine to form Sodium Chloride


When Water is electrolysed, it decomposes to Hydrogen and Oxygen.



For example: Zinc displaces Hydrogen from Hydrochloric Acid as Hydrogen gas


Double displacement reactions may be defined as the chemical reactions in which one component each of both the

reacting molecules is exchanged to form the products. During this reaction, the cations and anions of two different

compounds switch places, forming two entirely different compounds.


Double displacement reactions generally take place in aqueous solutions in which the ions precipitate and there is an exchange of ions.

For Example:


CH4(g) + 2 O2(g) CO2(g) + 2 H2O(g)

Reduction Reactions


Reduction is the loss of Oxygen or gain of Hydrogen

Redox Reactions Oxidation & Reduction Reactions


Both Oxidation and Reduction reactions occur simultaneously in the same chemical reaction. So,

Oxidation and Reduction reactions are studied together and they are collectively called as Redox

Reactions

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Types of Chemical Reactions

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