Which one is false for evaporation ?
Correct answer: C. Exothermic
- A. Surface phenomenon
- B. Continuous
- C. Exothermic
- D. Cause cooling
Explanation
Evaporation is a surface phenomenon that occurs continuously below the boiling point and causes cooling because higher-energy molecules escape, leaving lower average kinetic energy behind. It is endothermic rather than exothermic, so students may choose option b if they mistake continuous evaporation for heat release.
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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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