Vapour pressure is not affected by_______________?
Correct answer: A. Surface area
- A. Surface area
- B. temperature
- C. intermolecular forces
- D. atmospheric pressure
Explanation
For a liquid at a fixed temperature, vapour pressure depends mainly on the escaping tendency of its molecules, which is affected by temperature and intermolecular forces, not surface area. Students often choose temperature because it strongly changes vapour pressure, but option a is the factor that does not affect its equilibrium value.
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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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