Question

How can we say that matter is particulate in nature

Answer 1

Explanation:

Introduction

Matter – is anything that occupies space and has mass. Matter exists in three states namely; solid, liquid and gas.

Experiment

Aim: to demonstrate that matter is made up of smaller particles

Apparatus: Beakers, potassium permanganate crystals, water.

Procedure

Pour water into the beaker till it is half full

Dissolve some potassium permanganate crystals until the solution is purple

Transfer half the solution into another beaker and fill it with water

Continue the process with other beakers, comparing the colour of the solution through each dilution.

Observation

Image result for CHANGE OF COLOUR IN DILUTION

The colour of the solution fades away through each dilution until the solution appears colourless.

This shows that the particles of potassium permanganate are spread out evenly in the water. Each dilution spreads them out further as the water molecules increase in number. Hence the purple colour fades away with each dilution until it becomes colourless.

Conclusion

Potassium permanganate is made up of tiny particles.

Also, when some salt particles are put in a flask and water added, it is observed that after shaking the flask to dissolve the salt, the volume of the final solution is less than the original volume of the water plus undissolved salt. This is because salt particles fitted into some spaces between the water molecules. Hence the particles of the solution are more packed together, reducing the volume of the solution. This also indicates that the particles of water and those of salt differ in size.