Question

With the help of a labelled diagram describe an activity to show particles of an activity
are small.

Answer 1

(i) Take 2-3 crystals of potassium permanganate and dissolve them in 100 ml of water.

(ii) Take out approximately 10 ml of this solution and put it into 90 ml of clear water.

(iii) Take out 10 ml of this solution and put it into another 90 ml of clear water.

(iv) Keep on diluting the solution like this 5 to 8 times.

(v) This experiment shows that just a few crystals of potassium permanganate can change colour

of a large volume of water (about 1000 L).

So, we conclude that there must be millions of tiny particles in just one crystal of potassium

permanganate, which kept on dividing themselves into smaller and smaller particles.