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?
(a) Pollen grains are the extremely small particles observed under a microscope.
(b) Water, pollen grains are suspended in water.
(c) Brownian motion, it relates to movement of particles discovered by Robert Brown.
(d) The fast moving water molecules are constantly hitting particles X (pollen grains) causing them to move in a zig-zag path.
(e) Robert Brown
(g) The liquid Y is made up of extremely small particles which are constantly moving.