General chemistryLesson 4 of 6 in the course Liquids and Solids

Reading Phase Diagrams: Water, Carbon Dioxide, and Critical Points

5 flashcards · 5 quiz questions · 5 match pairs · 4 fill-in sentences · English

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Summary

A phase diagram maps the physical state of a substance as temperature and pressure change. It brings together information about melting, boiling, and sublimation and helps predict which phase is stable under specified conditions.

A phase diagram is a graph of pressure versus temperature that shows the conditions under which a substance exists as a solid, liquid, or gas. Each region identifies a stable phase. A point inside a region represents a single phase, while a point on a boundary represents two phases in equilibrium.

All flashcards

Phase diagram
A pressure–temperature graph showing which phases are stable under different conditions.
Phase boundary
A curve where the two phases on either side coexist in equilibrium.
Triple point
The temperature and pressure at which solid, liquid, and gas coexist in equilibrium.
Critical temperature
The temperature above which pressure alone cannot produce a distinct liquid phase.
Supercritical fluid
A substance above its critical point, with both gas-like and liquid-like properties.

Quiz questions

  1. What information does a phase diagram provide?Answer: Which phases are stable at different temperatures and pressures.
  2. What does a point on a phase boundary represent?Answer: Two phases coexisting in equilibrium under those conditions.
  3. What occurs at the triple point of a substance?Answer: Its solid, liquid, and gas phases coexist in equilibrium.
  4. Why does increasing pressure slightly lower the melting point of ice?Answer: Pressure favors denser liquid water over less-dense ice.
  5. What does a substance’s critical temperature determine?Answer: Whether pressure alone can produce a distinct liquid phase.

Based on Chemistry 2e by Paul Flowers, Klaus Theopold, Richard Langley, William R. Robinson, PhD (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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