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Question

Why is heat energy needed to melt a solid ? What is this heat energy called ?


Solution

Heat energy is needed to melt a solid because heat energy increases the kinetic energy of particles, which is sufficient enough to break the attraction or bond between the particles and they start moving faster. As a result, there is a change in the state of matter from solid to liquid.
This heat energy is called latent heat of fusion.

Science
Lakhmir Chemistry (2020, 2021)
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