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Latent Heat of Fusion

To determine ...

Question

To determine the melting point of ice a student immersed the bulb of the thermometer in the crushed ice in a beaker. He then heated the beaker on a low flame and observed that during melting of ice the temperature :

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Solution

In this case,the temperature remains same during melting of ice because this is the latent heat of fusion which is all used to overcome the intermolecular forces of ice and to change the state.

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Q. A student sets up an apparatus to determine the melting point of ice. He takes a beaker half filled with crushed ice and dips a mercury thermometer with an initial reading of room temperature (25ºC) in such a way that the bulb of the thermometer is surrounded by ice. The correct observation obtained by the student is that :
(1) Mercury in the thermometer keeps on falling till it reads, −1ºC and becomes constant thereafter
(2) temperature falls, reaches 0ºC, then it remains constant even after the whole of the ice has melted
(3) the temperature falls in the beginning but starts rising as soon as the ice starts melting
(4) temperature falls, reaches 0ºC and remains constant only as long as both ice and water are present in it

Q. The following precautions were listed for the experiment on the determination of the melting point of ice. The incorrect precaution is :
(1) The bulb of the thermometer should be kept surrounded with crushed ice.
(2) Ice should be stirred regularly to keep a uniform temperature throughout.
(3) The final temperature should be noted by keeping the eyes in line with the level of mercury.
(4) Only the tip of the bulb of the thermometer should just touch the crushed ice.

Q. When heat is constantly supplied by a gas burner with small flame to melt ice, then the temperature of ice during melting:

Q. Ice is floating on water in a beaker when ice completely melts then level of water in beaker:

Q. Ice contained in a beaker starts melting when

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Latent Heat of Fusion

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