Q6 of 11 Page 88

When will cool drinks get cooled faster – on placing ice cubes at 0°C or on adding water at 0°C? Justify your answer.

Ice cubes at 0°C will cool faster than water at same temperature because ice has e× tra capacity to absorb heat in the form of latent heat of fusion i.e. energy required to convert water from solid state to liquid state at 273K.


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4

“The high specific heat capacity of water causes land breeze and sea breeze”. Write down your comments about this statement.

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Write down an e× ample to know how the following factors influence the rate of evaporation.

(a) Surface area


(b) Wind

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2 kg of water at 293 K is converted completely into ice at 273 K. Calculate the heat liberated.

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2 kg of ice at –10°C is continuously heated to melt it completely. Calculate the quantity of heat required. (The latent heat of fusion of ice: 336 × 103 J/kg. The latent heat of vaporization of water: 226 × 104 J/kg. Specific heat capacity if ice: 2.1 × 103 J/kg K. Specific heat capacity of water: 4.2 × 103 J/kg K.)