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JAMB Chemistry 1985 Question 29

Question 29

Kinetic Theory and States of Matter

When pollen grains are suspended in water and viewed through a microscope, they appear to be in a state of constant but erratic motion. This is due to

  1. A.convection currents
  2. B.small changes in pressure
  3. C.small changes in temperature
  4. D.a chemical reaction between the pollen grains and water
  5. E.the bombardment of the pollen grains by molecules of water
Show the answer and explanation

Answer: E (the bombardment of the pollen grains by molecules of water)

Explanation

This is Brownian motion: the moving water molecules hit the pollen grains unevenly from all sides, pushing them about at random.