How will you demonstrate that particles of matter attract each other?

Describe, what happens to the particles when sugar dissolve in water.

How will you demonstrate that particles of matter are very small?

Out of solid, liquid or gas, which one has the maximum movement of particles?

Out of solid, liquid or gas, which one has maximum inter-particle forces of attraction.

Out of solid, liquid or gas, which one has minimum spaces in between constituent particles?

Why do gases have neither a fixed shape nor a fixed volume?

Why are gases easily compressible while it is almost impossible to compress a solid or a liquid?

How will you justify that ice, water and steam are the three states of a substance and not different substances?