Page 1 - 3. LESSON NOTES-(CHARACTERISTIC PROPERTIES OF MATTER)

SAI International School
Class-IX

Subject-Chemistry
Topic-Matter in our surroundings
Sub topic- Characteristic properties of Matter

LESSON NOTES
Matter- Matter is anything which occupies space and has mass is called matter. Air
and water, sugar and sand, hydrogen and oxygen etc.
1.Matter is particulate in nature.
2.Matter is made up of very small tiny particles
Particles Have Space Between Them

There are small voids between every particle in a matter. This characteristic is the
concept behind the solubility of a substance in other substances. Let’s try to
understand this with an illustration.

Take a glass of water. Put a teaspoon of salt/sugar and mix them properly. You will
observe that the water is still clear. This is because the particles of salt/sugar get into
the interparticle spaces between the water particles. This proves that there are voids
between particles of a substance. If you add more salt/sugar, it will dissolve until all
the space between water particles get filled.

Particles Are Constantly in Motion (or) Particles are Continuously Moving

Particles of the matter show continuous random movements. The kinetic energy they
possess helps them in this movement. The spreading of ink in a beaker of glass, the
smell that comes from agarbattis, etc. are few illustrations that show the movement of
particles of a substance. When the particles of two different types of matters intermix
on their own, the phenomenon is called diffusion.

Characteristics of Particles of Matter

Diffusion of particles becomes fast when the temperature is increased. A rise in
temperature increases the kinetic energy of the particles, making them move more
vigorously.

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