When the vapor pressure of a liquid equals atmospheric pressure,the temperature of the liquid equals ________.
A)100 °C
B)the boiling point
C)the normal boiling point
D)the vaporization point
E)the sublimation point

Question

Quizplus · Accepted Answer

When the vapor pressure of a liquid equals atmospheric pressure, the liquid boils and its temperature reaches the boiling point. Therefore, choice B (the boiling point) is the best answer. Choice C (the normal boiling point) is not necessarily correct as the normal boiling point is the boiling point at standard conditions (1 atm pressure). Choice A (100°C) is not always true as the boiling point of a liquid varies with the atmospheric pressure. Choice D (the vaporization point) is not precise as it does not specify whether it refers to the boiling point or another point of vaporization. Choice E (the sublimation point) is not relevant as sublimation refers to the direct transition of a solid to a gas without passing through the liquid phase.

When the Vapor Pressure of a Liquid Equals Atmospheric Pressure,the