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JAMB Physics 1980 Question 32

Question 32

Change of State and Vapours

Heat is supplied to a block of ice at 0° until half of it has melted. Which of the following statement is true?

  1. A.The temperature rises and the ice expands
  2. B.The temperature remains constant and the volume of ice decreases
  3. C.The ice gives out heat as it melts
  4. D.The mass remains constant and the temperature increases
  5. E.The mass decreases because some heat is lost to the atmosphere.
Show the answer and explanation

Answer: B (The temperature remains constant and the volume of ice decreases)

Explanation

While ice melts, the heat supplied is latent heat, so the temperature stays at 0°C, and since ice turns into denser water the volume decreases.