If we provide very high amount of heat to a liquid its boiling point will:
Correct answer: C. Constant
- A. Increase
- B. Decrease
- C. Constant
- D. Unknown
Explanation
When a liquid is heated, the kinetic energy of its molecules increases and hence the temperature also increases. At the boiling point, the kinetic energy of the molecules becomes maximum and any further heating at this stage will not increase the temperature. This heat will only be utilized to break the intermolecular forces and convert the liquid into its vapours.So the temperature of a boiling liquid remains constant, even when more heat is added. Also Boiling Point is a colligative property that is not changed by changing amount of heat provided.
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About Evaporation, Boiling Point and Vapour Pressure
Evaporation is the escape of higher-energy molecules from a liquid surface, while vapour pressure is the pressure exerted by vapour in equilibrium with that liquid. The topic distinguishes evaporation from boiling and relates both to temperature, intermolecular forces, surface area, atmospheric pressure and the boiling point.
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