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What is the boiling point of a liquid?

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Question: What is the boiling point of a liquid?

Options:

  1. The temperature at which vapor pressure equals atmospheric pressure
  2. The temperature at which a liquid freezes
  3. The temperature at which a liquid evaporates
  4. The temperature at which a liquid condenses

Correct Answer: The temperature at which vapor pressure equals atmospheric pressure

Solution: 

The boiling point is defined as the temperature at which the vapor pressure of a liquid equals the atmospheric pressure.

What is the boiling point of a liquid?

Practice Questions

Q1
What is the boiling point of a liquid?
  1. The temperature at which vapor pressure equals atmospheric pressure
  2. The temperature at which a liquid freezes
  3. The temperature at which a liquid evaporates
  4. The temperature at which a liquid condenses

Questions & Step-by-Step Solutions

What is the boiling point of a liquid?
  • Step 1: Understand that a liquid has molecules that are moving around.
  • Step 2: Know that these molecules can escape into the air as vapor.
  • Step 3: Realize that vapor pressure is the pressure created by these escaping molecules.
  • Step 4: Learn that atmospheric pressure is the weight of the air above us.
  • Step 5: The boiling point is reached when the vapor pressure of the liquid is equal to the atmospheric pressure.
  • Step 6: At this point, the liquid starts to turn into vapor quickly, which is what we see as boiling.
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