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General Chemistry

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Liquids, Solids, and Phase Transitions

Question
7 out of 10
 

A phase diagram illustrates the physical state of a substance with respect to the temperature and the pressure of the surroundings. The points plotted to draw the phase diagram are derived experimentally, and are usually plotted with temperature on the x-axis and pressure on the y-axis. A typical phase diagram is shown below in Figure-1.

image\27286 Ch 7.jpg


From the phase diagram given in the passage, predict the likely phase change if the following changes happen. Consider point A as the current phase of substance M. What is the most likely effect on substance M, if the pressure was decreased without changing the temperature of the system?

A Gas to liquid
B Liquid to gas
C Liquid to solid
D Solid to liquid

Ans. B The question describes a phase change scenario based on the diagram given in the passage. Substance M will be a liquid at point A. If the pressure is decreased, the most likely phase change will be from liquid (the phase before the change) to gas.

Liquids, Solids, and Phase Transitions Flashcard List

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