The boiling point of water is 100°C. Express this in SI units (Kelvinscale).

When extremely small particles X derived from the another of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig zag way. It was also observed that warmer the liquid Y, faster the particles X moved in its surface.

(a) What could particles X be?

(b) What do you think liquid Y is?

(c) What is the zig-zag movement of particles X?

(d) What is causing the zig-zag movement of particles X?

(e) Name the scientist who discovered this phenomenon.

(f) What does this experiment tell us about the nature of liquid Y?

When a beam of sunlight enters a room through a window, we can see tiny particles X suspended in a gas (or rather a mixture of gases) Y which are moving rapidly in a very haphazard manner.

(a) What could particles X be?

(b) Name the gas (or mixture of gases) Y.

(c) What is the phenomenon exhibited by particles X known as?

(d) What is causing the movement of particles X?

(e) What conclusion does the existence of this phenomenon give us about the nature of matter?

The Kelvin temperature is 270K. What is the corresponding Celsius scale temperature?

Convert the temperature of 573K to the Celsius scale.