Physical Chemistry : Other Phase Interface Principles
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Example Question #11 : Phases And Properties Of Matter
Which of the follow are false?
I. Three phases can coexist at the triple point.
II. It is not possible for ice to transition directly to water vapor without become a liquid first.
III. The slope of the ice/water phase curve is positive
IV. Distinct phases are not achievable above the critical point
II and III
III and IV
II and IV
I only
IV only
II and III
Condition I is true. The only place three phases can coexist is at the triple point.
Condition II is false. Water in fact can undergo deposition and move from the solid phase to the gas phase directly. This occurs at pressures below 0.006atm.
Condition III is false. A peculiar fact of the water phase diagram is the slope of the solid/liquid line. For most phase diagrams, the slope is sharply positive, but that of water is negative.
Condition IV is true. No distinct phases exist above the critical point.
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