If we provide very high amount of heat to a liquid its boiling point will__________________?
Correct answer: B. remains constant
- A. increase
- B. remains constant
- C. decrease
- D. there will be no boiling
Explanation
At the boiling point, the liquid vapour pressure equals the external pressure, and additional heat is used to overcome intermolecular attractions and convert liquid into vapour rather than raise the temperature. Students may choose option a by assuming that supplying more heat always increases temperature, but the temperature remains constant during boiling at fixed pressure.
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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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