how will you show the particulate nature of matter
Answers
All matter is particulate in nature. This basically means that between separate bits of matter there are spaces which contain no matter. In science it is called the "atomic nature of matter." ... However, you probably know that there is a substructure to an atom; that it is made of protons, neutrons and electrons.
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PARTICULATE NATURE OF MATTER
Matter is made up of small particles
The particle nature of matter can be demonstrated in activity 4.1:
ACTIVITY4.1
To demonstrate particle nature of matter
1. Take about 50 cm3 water in a 100 cm3 beaker.
2. Mark the level of water.
3. Add some sugar to the beaker and stir with the help of a glass rod.
4. Observe the change in water level.
Fig. 4.1. Dissolution of sugar in water. In solution particles of sugar are present in the spaces between particles of water
It is observed that the crystals of sugar disappear. The level of water remains unchanged. These observations can be explained by assuming that matter is made up of small particles. On dissolution, the particles of sugar get distributed into the spaces between particles of water.
• The constituent particles of matter are extremely small in size
The following activity demonstrates that the constituent particles of matter are very small
ACTIVITY 4.2
To demonstrate that the particles of matter are very small
1. Take a 250 cm3 beaker and add 100 cm3 water to it
2. Now add 2-3 crystals of KMnO4 and stir with a glass rod in order to dissolve the crystals.
3. Take 10 cm3 of this solution and add to 100 cm3 of water taken in another beaker.
4. Take 10 cm3 of this diluted solution and put into 100 cm3 of water taken in still another beaker.
5. Repeat this process 10 times. Observe the colour of the solution in the last beaker.
It is observed that the water in the last beaker is still coloured but the intensity of colour becomes light It indicates that KMnO4 crystal contains millions of tiny particles, some of which are still present even in the last beaker after so much dilution.
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