# Lesson Notes By Weeks and Term - Senior Secondary 1

Particulate nature of matter

Term: 2nd Term

Week: 9

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject:      Physics

Topic:-       Particulate nature of matter

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

1. Discuss the evidence of the particle nature of matter
2. Explain molecules, Brownian motion and diffusion

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

 PRESENTATION TEACHER’S ACTIVITY STUDENT’S ACTIVITY STEP 1 INTRODUCTION The teacher reviews the previous lesson on the arrangement of resistors Students pay attention STEP 2 EXPLANATION He discusses the evidence of the particle nature of matter Students pay attention and participates STEP 3 DEMONSTRATION He explains the meaning of molecules, Brownian motion and diffusion Students pay attention and participate STEP 4 NOTE TAKING The teacher writes a summarized note on the board The students copy the note in their books

NOTE

PARTICULATE NATURE OF MATTER

STRUCTURE OF MATTER

(a) EVIDENCE OF THE PARTICLE NATURE OF MATTER

The idea that matter is made up of minute particles called atom dated back to the ancient Greek. Atom is the smallest indivisible Particle of an element which can take part in a chemical change. It consists of proton, neutron and electron. Proton is positively charged, neutron is neutral and electron is negatively charged.

MOLECULES

A molecule is the smallest particle of a substance which can have a separate existence and still retains the properties of that substance.

BROWNIAN MOTION

Brownian motion is the rapid, constant and irregular motion of tiny particles. This can be observed when a dust particle is in continuous state of haphazard movement caused by the impact of moving water molecules. This continuous motion also occurs in smoke molecule.

DIFUSSION

Diffusion is the tendency of molecule to migrate and fill an empty space due to their random motions.

EVALUATION:   1. Discuss the evidence of the particle nature of matter

1. Explain
1. molecules
2. Brownian motion
3. diffusion

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively