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Latent Heat of Vaporisation

nbsp;Is cooli...

Question

Is cooling also caused during boiling a liquid?

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Solution

When we boil water, we supply heat to it there is no cooling involved in the process.

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Q. Assertion :Evaporation causes cooling Reason: Particles of liquid absorb energy from the surrounding to regain the energy lost during evaporation.

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(a) Boiling occurs at ___

(b) Evaporation takes place at ___

(c) The molecules of liquid ___ heat from surroundings in evaporation.

(d) Heat is ___ during boiling.

(e) Cooling is produced in ___

(f) A longer rod expands ___ than a shorter rod on being heated to the same temperature.

(g) Liquids expand ___ than the solids.

(h) Gases expand ___ than the liquids.

(i) Alcohol expands ___ than water.

(j) Iron expands ___ than copper.

Q. During distillation, the liquid with a lower boiling point separates out before the liquid with a higher boiling point.

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3) How is heat is supplied to a liquid used during boiling at a fixed temperature??
4) Name two ways of changing liquid state to the vapour state and distinguish them??

Q. Physical changes like boiling do not make new materials and are easily reversed e.g. by cooling, which causes ________.

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Latent Heat of Vaporisation

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