an activity to show that particles of matter are very small
Answers
5 Test tubes filled with water upto 3/4th, a dropper, small crystals of KMnO4
Method:-
In the first test tube , drop one small crystal of KMnO4 and then cover the mouth of the test tube with thumb and shake the test tube vigorously.Observe the color of the solution.
After that with the help of a dropper,take out a few drops of solution from it and pour into second test tube and cover its mouth to shake its contents vigorously. Again observe the color of the solution. Repeat this procedure for test tube no. 3,4 and 5 and observe the color change.
Observation:
One can notice that the color of solution in the first test tube is deep pink. But it starts becoming less and less pink in the successive test tubes till the pink color is hardly visible.
Conclusion:
The color of KMnO4 fades on dilution with water since
the particles of KMnO4 decrease gradually from first test tube to the last.
Therefore,one can conclude that the particles of matter are very, very
small and are not visible to the naked eye.
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.
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