When ice is changed into water, heat is released.

Q. How much heat energy is released when $5.0g$ water at ${42}^{\circ }C$ changes into ice at $0^{\circ }C$? Take specific heat capacity of water = $4.2J{g}^{-1}$, specific latent heat of fusion of ice = $336J{g}^{-1}$ :

Q.

Calculate the amount of heat released when 5.0 g of water at 20 °C is changed into ice at 0 °C.

Specific heat capacity of water = 4.2J g^-1 °C^-1, Specific latent heat of fusion of ice = 336 J g^-1.

Q. When ice is changed into water and then to water vapour then where does the heat will go if more heat is applied to it?
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Q.

When ice changes into water, there is no change in:

Q. In which of the following is energy released :
(i) When ice melts
(ii) When water vapour converts into liquid water
(iii) When water evaporates to form water vapour