Question

By an activity to show that particle of matter are very small

Answer 1

To know how small are these particles, let us take 2 or 3 crystals of potassium permanganate and dissolve them in 10 ml of water taken in a test tube. Colour of the solution will be purple. Now transfer 1 ml of this solution to another test tube and add 9 ml of water to make the volume again to 10 ml . The intensity of purple colour will somewhat decreases. Repeat this experiment 3 or 4 times. It is surprising to note that the purple colour will not disappear altogether though it becomes lighter and lighter with each dilution. Thus we conclude that there must be millions of tiny particles present in one crystal of potassium permanganate which keep on dividing into smaller and smaller number with each dilution thereby making the colour lighter and lighter.

Answer 2

Answer:

An activity to show that particles of matter are very small is explained in the given experiment

Explanation:

1. Dissolve potassium permanganate crystals in 100 ml of water.

2. Remove approximately 10 ml of this solution and add to 90 ml of fresh water collected in another beaker.

3. Next, remove 10 ml of solution from this solution and add  90 ml of water taken in another beaker.

4. Continue to dilute the solution 5-8 times in the same way.

Observation :

This experiment shows that only a small amount of potassium permanganate crystals can color a large amount of water (about 1000 L).

Conclusion :

This activity proves that matter is composed of small particles. From this, we conclude that one crystal of potassium permanganate requires the presence of millions of small particles, which continue to break down smaller particles. after some time a stage where the particles cannot break down into smaller particles is reached.

Explanation: