American Chemical Society (ACS) Chemistry Practice Exam

Question: 1 / 400

A high vapor pressure indicates what regarding a substance's boiling point?

Higher boiling point

Lower boiling point

A high vapor pressure indicates that a substance readily vaporizes, which correlates to a lower boiling point. This is because substances with high vapor pressures have a greater tendency to escape from the liquid phase into the gas phase at lower temperatures.

As the temperature rises, the kinetic energy of the molecules increases, and once the vapor pressure equals the atmospheric pressure, the substance will boil. Therefore, if a substance has a high vapor pressure at a given temperature, it means that it can reach this crucial point of equal pressure at a lower temperature compared to substances with lower vapor pressures, which require more heat to reach their boiling point.

Consequently, a substance with high vapor pressure will boil at lower temperatures, leading to the conclusion that a high vapor pressure corresponds to a lower boiling point.

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Stable boiling point

Variable boiling point

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