Chemistry is the branch of science concerned with the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances.
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WHAT IS MOLECULE:
Molecule: A group of two or more atoms that form the smallest identifiable unit into which a pure substance can be divided and still retain the composition, and chemical properties of that substance is called Molecule. Molecules form when two or more atoms form chemical bonds with each other. It doesn't matter if the atoms are the same or are different from each other.
Examples of Molecules:
Molecules may be simple or complex. Here are examples of common molecules:
H2O (water)
N2 (nitrogen)
O3 (ozone)
CaO (calcium oxide)
C6H12O6 (glucose, a type of sugar)
NaCl (table salt)
WHAT IS COMPOUND:
A compound is a chemical species that formed when two or more atoms join together chemically, with covalent or ionic bonds.
Compounds are chemical substances made up of two or more elements that are chemically bound together in a fixed ratio.
Examples of Compounds:
Examples of compounds include
table salt or sodium chloride (NaCl, an ionic compound
 Carbon dioxide (CO2)
Water (H2O, a covalent molecule).
 
Difference Between Molecule and Compound
Sl. No.
Differentiating Property
Molecule
Compound

1
Definition
A molecule is a group of two or more atoms held together by chemical bonds.
A compound is a substance which is formed by two or more different types of elements which are united chemically in a fixed proportion.

2
Relatedness
All molecules are not compounds.
All compounds are molecules.

3
Example
An example of a molecule is ozone.
An example of a compound is table salt (sodium chloride).

4
Structure
Molecules are simply a group of atoms which are bonded by a strong force.
All compounds are actual matter in their complete shape.

5
Visibility
A
Molecules can not be seen with the naked eye as they are at the atomic level.
A compound can be easily seen with the naked eye.