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JAMB Chemistry 1984 Question 8

Question 8

Kinetic Theory and States of Matter

Naphthalene when heated melts at 354 K (81°C). At this temperature the molecules of naphthalene

  1. A.decompose into smaller molecules
  2. B.change their shape
  3. C.are oxidized by atmospheric oxygen
  4. D.contract
  5. E.become mobile as the inter molecular forces are broken.
Show the answer and explanation

Answer: E (become mobile as the inter molecular forces are broken.)

Explanation

Melting is a physical change: heat overcomes the forces holding the molecules in the solid, so the molecules become free to move about as a liquid.