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Question
When pure water boils vigorously, the bubbles that rise to the surface are composed primarily of ______.
When pure water boils vigorously, the bubbles that rise to the surface are composed primarily of ______.
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Solution
The correct option is A water vapour
When we first start to boil water, the bubbles are basically air bubbles. These are bubbles formed from the dissolved gases in water. The solubility of a gas in water decreases when the temperature is increases, and that is why the dissolved air bubbles come out from the water.Then, as the boiling point of water is reached, water vapor starts to form in the form of bubbles. The molecules gain enough energy to transition from the liquid phase to the gaseous phase. These bubbles are water vapour.
When we first start to boil water, the bubbles are basically air bubbles. These are bubbles formed from the dissolved gases in water. The solubility of a gas in water decreases when the temperature is increases, and that is why the dissolved air bubbles come out from the water.
Then, as the boiling point of water is reached, water vapor starts to form in the form of bubbles. The molecules gain enough energy to transition from the liquid phase to the gaseous phase. These bubbles are water vapour.
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