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Lesson Plan of Topic MOLECULES of Class 9th

Lesson Plan of MOLECULES of Class 9

Lesson Plan of MOLECULES of Class 9

This article contains complete lesson plan of Colloidal Solution of Class IX NCERT following CBSE board.

General Aims

  1. To develop interest of students in physical science.
  2. To develop an inquiry spirit in the students.
  3. To help students to see the physical science in relation to the rest of the culture.
  4. To develop interest in questioning.
  5. To develop critical thinking and scientific attitude.
  6. To develop supervisory ability in students.
  7. To develop problem solving skills in students.
  8. To make the students aware about inventions in the field of physical science and acquaint them with the knowledge of different streams of physical science.

Specific Objectives

  1. Students will be able to recall elements.
  2. Students will be able to describe molecules of elements and compounds.
  3. Students will be able to solve the questions of atomicity.

Teaching Aids

Chart, Roller board, pointer and other useful classroom equipments.

Previous Knowledge

Students are already aware about elements and compounds.

Introductory Questions

Pupil-Teacher Activity

Student’s Response

Q1. Which gases are present in atmosphere?

Nitrogen, oxygen, carbon dioxide, etc.

Q2. Which gas is essential for breathing?


Q3. In which form oxygen exists?

Oxygen exist as oxygen molecule

Statement of Aim

So, today we are going to study about the topic ‘Molecules’.


Teaching point 1: Definition of Molecules

A molecule is the smallest particle of an element or a compound that is capable of an independent existence and shows all the properties of that substance.

Atoms of same element or different elements can join together to form molecules.

Teaching point 2: Molecules of Elements

The molecules of an element is constituted by the same type of atoms.

The number of atoms constituting a molecule is known as its atomicity.

On the basis of atomicity, elements could the monoatomic, diatomic or sometimes Tetra-atomic or polyatomic.

Monoatomic- Molecules of element that are made up of only one atom of that element is called as monoatomic molecule.

For Example: Argon, Helium, etc. are made up of only one atom.

Diatomic- When molecules of any element consists of two atoms it is known as diatomic molecule. Example: oxygen, Hydrogen etc.

  • Molecule of Carbon have a very large indefinite number of atoms bonded together.
  • Molecules of metals are generally monoatomic.
Teaching point 3: Molecules of Compounds

Atoms of different elements join together in definite proportions to form molecules of compounds.

For Example: Water is a compound, in which hydrogen and oxygen elements are combined In A ratio of 1 : 8 by mass.

Here, 1 Oxygen atom combines with 2 Hydrogen atoms.

Blackboard Summary

  • Molecules is a group of two or more atoms that are joined together.
  • Molecules of elements are made up of same type of atoms.
  • The number of atoms constituting a molecule is called as its
  • On the basis of atomicity, elements could be monoatomic, diatomic tetra or polyatomic.
  • Molecules of metals are generally mono-atomic.
  • Molecules of compounds are made up of different types of elements join together and definite proportion.

Classroom Supervision

Pupil-teacher will supervise the problem of the students and solve it.

Evaluation Questions

Q1. _________ is a smallest particle of element or compound.

Q2. The number of atoms constituting a molecule is called its _________.

Q3. Hydrogen is monoatomic. (True/False)

Q4. Oxygen is a diatomic molecule. (True/False)

Q5. According to atomicity Argon is a _______ molecule:

  1. Monoatomic
  2. Diatomic
  3. Tetra-atomic
  4. Polyatomic


Q. Write down the atomicity of the following: Argon, Hydrogen, Chlorine, Oxygen, etc.

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