Please select a subject first
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All molecules of a liquid take part in boiling.
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Boiling is a rapid phenomenon.
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Boiling occurs at ....................
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Evaporation takes place at ................. .
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The molecules of liquid ............. heat from surroundings in evaporation.
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Heat is ................... during boiling.
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Cooling is produced in ....................
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Match the column
| Column A | Column B |
| (a) Blowing air increases | (1) Increase in intermolecular separation |
| (b) Increase in pressure increases | (2) Pendulum of a clock |
| (c) Thermal expansion |
(3) Cooking utensils |
| (d) Invar | (4) Boiling point |
| (e) Pyrex glass | (5) Evaporation |
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The rate of evaporation of a liquid increases when:
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During boiling or vaporization
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The boiling point of a liquid is increased by
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Do all the molecules of a liquid take part in evaporation? If not, explain your answer.
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No heat is supplied to a liquid during evaporation. How does then the liquid change into its vapours?
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Comment on the statement ‘evaporation is a surface phenomenon’.
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Why is cooling produced when a liquid evaporates?
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Give reason for the increase in rate of evaporation of a liquid when air is blown above the liquid.
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Give reason for the increase in rate of evaporation of a liquid when surface area of liquid is increased.
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Give reason for the increase in the rate of evaporation of a liquid when temperature of liquid is increased.
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What is boiling? Explain it on the basis of molecular motion?
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