While water boils to water vapours, the temperature:
Correct answer: A. Remains constant
- A. Remains constant
- B. Becomes zero
- C. Decreases
- D. Increases
Explanation
As the temperature of water reaches its boiling point, 100°C, liquid water begins to convert to water vapours. While this process occurs, the temperature remains at a constant of 100°C until all of the water has converted to gas. This is because the extra heat energy is used to break the hydrogen bonding in water rather than raising the temperature of water.
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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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