Describe in your own words, what happens to the particles when salt dissolves in water.

When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?

When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.

Explain why, we can easily move our hand in air but to do the same through a plank of wood, we need a karate expert.

Give one example of the diffusion of a solid in another solid.