AP Chemistry : Properties of Liquids

Study concepts, example questions & explanations for AP Chemistry

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Example Questions

Example Question #1 : Solids And Liquids

If you create a perfect vacuum and place a glass of water into the vacuum at room temperature, what will happen to the water?

Possible Answers:

The water will freeze

The water will boil

The water will boil very rapidly and then stop

The water will float about the vacuum

Nothing will happen

Correct answer:

The water will boil


Boiling occurs when the vapor pressure exceeds the air pressure. There is no air pressure in a vacuum, so water at any temperature will boil in a vacuum.

Example Question #2 : Properties Of Liquids

Boiling points at standard temperature and pressure:




Methylene chloride-


Of the five compounds given, which will have the highest vapor pressure at standard temperature and pressure?

Possible Answers:




Methylene chloride


Correct answer:

Methylene chloride


A liquid will boil when its vapor pressure increases to match the pressure of its environment. By this logic, a liquid with a higher vapor pressure will be closer to boiling. Liquids with low boiling points thus have greater vapor pressures.

Of the given compounds, methylene chloride has the lowest boiling point, meaning it will also have the highest vapor pressure.

Example Question #3 : Properties Of Liquids

Oil and vinegar is a very popular salad dressing. It also is commonly used for dipping bread. The main component of the oil phase is olive oil, while the main part of the vinegar portion is aqueous acetic acid.

When oil and vinegar salad dressing is allowed to stand at room temperature, two distinct phases are observed. The main explanation for this phenomenon is the difference in _________ of the two phases.

Possible Answers:






Correct answer:



Olive oil, like most oils, is non-polar, while aqueous acetic acid is very polar. These two phases do not mix because of their different solvent polarities.

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