You may have noticed that when water boils, you can see bubbles that rise to the surface of the water. Which of the following is inside these bubbles? Explain. a. air b. hydrogen and oxygen gas c. oxygen gas d. water vapor e. carbon dioxide gas

Short Answer

Expert verified
The correct answer is (d) water vapor. The bubbles formed during boiling are due to water molecules escaping the liquid phase and entering the gas phase, and the boiling process does not produce other gases like oxygen or carbon dioxide. Therefore, the bubbles primarily consist of water vapor.

Step by step solution

01

Understand the process of boiling water

When water is heated, the molecules absorb heat and gain energy. This leads to an increase in their kinetic energy, causing the molecules to vibrate and move around more rapidly. As the temperature of the water continues to rise, the molecules eventually have enough energy to break free from the liquid state and enter the gas phase. This process is known as boiling.
02

Understand the composition of the bubbles

The bubbles formed during boiling are due to water molecules escaping the liquid-phase and entering the gas-phase. When this happens, they combine to form pockets of gaseous water molecules, otherwise known as water vapor. Since the boiling process does not involve chemical reactions that would produce other gases like oxygen or carbon dioxide, the main component of these bubbles is water vapor.
03

Choose the correct option

From the understanding of the boiling process and the composition of the bubbles formed during boiling, we can now determine the correct option among the given choices: a. air b. hydrogen and oxygen gas c. oxygen gas d. water vapor e. carbon dioxide gas Based on our analysis, the correct answer is (d) water vapor, as the bubbles primarily consist of water molecules that have entered the gas-phase due to the boiling process.

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