During-boiling of water- why thermometer does not show any rise in temperature after reaching 100 degree Celsius mark even after heat is provided- Heat provided is used in decreasing the pressure-Heat provided is used in making the intermolecular forces strong-Heat provided is used in reducing the volume of vapour-Heat provided is used in breaking the intermolecular forces-

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Byju's Answer

Standard VIII

Chemistry

Latent Heat of Vapourisation and Fusion

During boilin...

Question

During boiling of water, why thermometer does not show any rise in temperature after reaching 100 degree Celsius mark even after heat is provided?

Heat provided is used in decreasing the pressure.

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Heat provided is used in making the intermolecular forces strong.

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Heat provided is used in breaking the intermolecular forces.

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Heat provided is used in reducing the volume of vapour.

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Solution

The correct option is C
Heat provided is used in breaking the intermolecular forces.

The main reason for no rise in temperature is nothing but the heat provided is utilized in breaking the bonds within the molecules of water. This breaking of bonds convert the water into the vapour. This heat which is not visible on the thermometer is known as Latent Heat of vapourization.

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Q. Assertion :Water in a beaker cannot be made to boil by placing it in a bath of boiling water. Reason: Water in the beaker will be heated to

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define the term:-heat of fusion. why amorphous solids have definite heat of fusion??

EXPERT ANSWER

It has been observed thattemperature remains constant till all solid melts into liquid. The heat supplied is used for changing a solid state into its liquid state by overcoming the particle-particle attraction force. The solid substance absorbs heat energy without showing any rise in temperature. This heat energy is called latent heat. The amount of heat required to convert a unit mass of a solid into its liquid state, without a change in temperature (i.e. at its melting point) is called the latent heat of fusion.

As amorphous solids are isotropic they will have same values of physical quantities such as, heat of fusion in all directions.

the answer provided by the mn expert is wrong as amorphous solids do not have a definite heat of fusion.

Q. Assertion (A): During melting of ice, the temperature of the system does not change after the melting point is reached, till all the ice melts.
Reason (R): When ice is heated, the heat gets used up in changing the state by overcoming the forces of attraction between the particles.

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