Post-UTME Physics 2019 Objective — Question 4
Question 4 of 20 from the Post-UTME Screening (Post-UTME) Physics 2019 Objective paper, with the correct answer and a full explanation.
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During the transformation of matter from the solid to the liquid state, the heat supplied does not produce a temperature increase because
- A. the heat energy is quickly conducted away
- B. the heat capacity has become very large as the substance melts
- C. the heat gained is equal to the heat lost by the substance
- D. all the heat is used to break the bonds holding the molecules of the solid togetherCorrect
Explanation
During melting (a phase change), the supplied heat (latent heat) is used entirely to break intermolecular bonds, not to raise temperature.
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