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During the transformation of matter from solid to…

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During the transformation of matter from solid to liquid state, the heat supplied does not produce temperature increase because

  • A. All the heat is used to break the bonds holding the molecules of the solid together
  • B. The heat capacity has become very large as the substance melts
  • C. The heat energy is quickly conducted away
  • D. The heat gained is equal to the heat lost by the substance.




During phase change, all the heat energy supplied is often used to break the bonds holding the molecules together, this means there will be no free energy to increase the average kinetic energy and temperature of the molecules. When the bonds responsible for holding the molecules together is completely overwhelmed, any extra heat will now raise the temperature of the substance.

Now for the right answer to the above question:

  1. Option A is correct.
  2. Option B is incorrect.
  3. C is incorrect. the heat supplied is within and not conducted to anywhere else.
  4. D is not the correct answer. Not really, heat is not usually lost at this stage.


You may please note these/this:

  • During state change, all available energy goes into breaking bonds, none will be left to change temperatures.
  • This kind of heat has a special name called ‘LATENT HEAT’.

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/culled from 2019 JAMB-UTME physics question 9/

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