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General Chemistry

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Liquids, Solids, and Phase Transitions

Question
5 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


Which of the following represents the correct phase diagram of water?

A
B
C
D

Ans. B To answer this question, we need to recall some basic aspects regarding phase diagrams. Just by knowing those, we can eliminate some of the choices right away. In Choices A and D, the phases are wrongly labeled. The phases are correctly labeled only in Choices B and C. This rules out Choices A and D. Water has some anomalous properties. Such properties make water unique. In fact, the solid-liquid segment in the phase diagram of water has a negative slope.

Liquids, Solids, and Phase Transitions Flashcard List

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