What is a chemical reaction

What is a chemical reaction

What is a chemical reaction

A chemical reaction is a process that occurs when two or more molecules react or combine to form a new substance. It is not compulsory to combine the molecules, in many cases, a single molecule breaks down to form new substances.

A chemical reaction is also a chemical change where the quality of the element gets changed after the transformation. That transformation can be caused by electricity, heat, or light.

Types of chemical reaction:

Combination Reaction

A reaction in which two or more reactants combine to form a single product is known as a combination reaction.

General method to represent combination reaction:

X + Y → XY

A combination reaction is also known as a synthesis reaction.

Example: 2Na + Cl2 → 2NaCl

Decomposition Reaction

A reaction in which a single compound breaks into two or more simpler compounds is known as a decomposition reaction.

General form:

XY → X + Y

A decomposition reaction is just the opposite of a combination reaction.

Example: CaCO3 → CaO + CO2

The reaction in which a compound decomposes due to heating is known as a thermal decomposition reaction.

Displacement Reaction

A chemical reaction in which a more reactive element displaces a less reactive element from its aqueous salt solution.

General form:

X + YZ → XZ + Y

It is also called a substitution reaction

Example of displacement reaction: Zn + CuSO4 → ZnSO4 + Cu

Double Displacement Reaction

A chemical reaction in which ions get exchanged between two reactants which form a new compound is called a double displacement reaction.

General form:

XY + ZA → XZ + YA

It is also called a metathesis reaction

Example of double displacement reaction:

BaCl2 + Na2SO4 → BaSO4 + 2NaCl

see also: Motion in One Dimension | Chapter 2 | ICSE

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