Page 69 - SCERT Kerala State Syllabus 8th Standard Basic Science Textbooks English Medium Part 1_Neat

Copper sulphate
Potassium
permanganate Sugar solution
Salt solution solution
solution
Water

Copper

Carbon Iron ore Sulphur

The earth in which we live is rich in diverse substances. Most of
these substances which occur in different physical states, are
mixtures and a few others are pure substances. Classify the
substances familiar to you into mixtures and pure substances.
Do you see such substances in the above picture? How are these
substances produced?
Break a piece of sugar candy. Break the pieces thus obtained, again
into smaller pieces. Have you ever thought how small the
particles can be made into by breaking it?

Sugar candy, potassium permanganate, gold, silver, etc., are pure
substances. You know that the particles in sugar candy and
potassium permanganate solutions cannot be seen as they are
extremely small.
Now, let's carry out an experiment.
Take one or two pieces of camphor in a china dish. Heat the china
dish slowly. What do we observe?

• What kind of change occurs to camphor?
• Do you get the smell?

Basic Science VIII
68 68 Basic Science VIII