Question

Account for the following observations :
(a) At the melting point temperature even though heat
energy is constantly supplied, temperature does not
rise till the entire solid has changed to liquid state.
(6) Water becomes cold if we add some ice cube to it.​

Answer 1

Answer:

At the melting point, temperature does not rise till the entire solid has changed to liquid state because the heat energy supplied to change the state of matter only overcome the forces of attraction between the particles and increase the kinetic energy of particles. This heat energy does not increase the temperature and thus, temperature remains constant during change of state.

When water is converted into ice, it takes the latent heat of fusion from the surrounding water molecules to become liquid to solid. Thus, the water becomes cold.

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Answer 2

Explanation:

(b)Water becomes cold if we addsome ice cubes to it because of conservation of energy. Heat is a form of energy. The temperature of water is more than ice cubes, so the heat flows from the waterto ice cubes. The heat gained by the melting of ice cubes is equal to the heat lost by liquid water