Page 57 - SCERT Kerala State Syllabus 8th Standard Basic Science Textbooks English Medium Part 1_Neat

Tiny particles in matter

Fill three fourth of a beaker with water. Put two or three crystals
of potassium permanganate into it and stir well.
What happened to potassium permanganate crystals?

Can you see the crystals?

Why the particles cannot be seen even though potassium
permanganate is present in the solution?

It may therefore be inferred that each crystal of potassium
permanganate is made up of crores of tiny particles.
Let's do another experiment.

Put some sugar in water and stirr.
Are the the sugar crystals visible? You can guess why?
Does this solution have the sweetness of sugar?

Aren't the dissolved tiny sugar particles that impart its property
to the solution?

Each substance is made of tiny particles which cannot be seen with
naked eyes. These particles bear all the properties of the substance.

Arrangement of particles in different states of matter

Note how some other characteristics of particles of substances in
different physical states have been listed.

particles have a distance between them.
particles move continuously.

particles attract one another.
The magnitude of these properties differ in various states.
Let's see how.
Observe the Figure 4.4.

Basic Science VIII
56 56 Basic Science VIII