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JAMB Physics 1997 Question 25

Question 25

Change of State and Vapours

What happens when a certain quantity of pure ice is completely changed to water at 0 °C?

  1. A.Latent heat is absorbed, the mass remains constant and the volume decreases
  2. B.Latent heat is given out, the mass remains constant and the volume decreases
  3. C.Latent heat is given out, the mass increases and the volume remains constant
  4. D.Latent heat is absorbed, the mass decreases and the volume increases
Show the answer and explanation

Answer: A (Latent heat is absorbed, the mass remains constant and the volume decreases)

Explanation

Melting needs latent heat to be absorbed. The mass does not change, and because ice is less dense than water, the volume gets smaller.