Question

c. Explain the role of latent heat in the change of state of a substances.
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Answer 1

Answer:

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The role of latent heat in the change of state of a substance are:

⇒ Latent heat of fusion: The latent heat of fusion helps to transform any substance from solid state to liquid state by absorbing heat energy at constant temperature during transformation.

⇒ Latent heat of vaporization: The latent heat of vaporization helps to transform any liquid substance from liquid state to gaseous state by absorbing heat energy at constant temperature during transformation.

Answer 2

Answer:

1. The heat energy absorbed at constant temperature during transformation of solid

into liquid is called the latent heat of fusion.

2. This heat energy is utilized for weakening the bonds between the atoms or molecules

in the solid and transform it into liquid phase.

3. Similarly, the heat energy absorbed at constant temperature during transformation

of liquid into gas is called the latent heat of vapourization.

4. This heat energy is utilized for weakening the bonds between the atoms or molecules

in the liquid and transform it into gaseous phase.

5. During transformation of gaseous phase to liquid phase and from liquid phase to

solid phase, latent heat is given out by the substance to the atmosphere.

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