State two characteristics of matter demonstrated by:

(a) Diffusion.

(b) Brownian motion.

Name one property of liquids and gases which tells us that their molecules are moving constantly.

Fill in the following blanks with suitable words:

(a) The best evidence that the particles of matter are constantly moving comes from the studies of………. and ……….

(b) The smell of perfume gradually spreads across a room due to ………….

(c) Solid, liquid and gas are the three………….. of matter.

(d) At room temperature, the forces of attraction between the particles of solid substances are………….. than those which exist in the gaseous state.

(e) The arrangement of particles is less ordered in the…………. State. However, there is no order in the………State.

Name the scientist who studied the movement of pollen grains suspended in water through a microscope. What is this phenomenon known as?

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?