Referring to the phase diagram in Section 12.8, describe...

Referring to the phase diagram in Section $12.8,$ describe what happens to the phase of $\mathrm{CO}_{2}$ during each process. a. reducing the pressure on solid $\mathrm{CO}_{2}$ that is at $-80^{\circ} \mathrm{C}$ b. decreasing the temperature on $\mathrm{CO}_{2}$ gas that is held at a pressure of 20 atm c. increasing the temperature on solid $\mathrm{CO}_{2}$ that is held at a pressure of 0.8 atm

Referring to the phase diagram in Section $12.8,$ describe what happens to the phase of $\mathrm{CO}_{2}$ during each process.
a. reducing the pressure on solid $\mathrm{CO}_{2}$ that is at $-80^{\circ} \mathrm{C}$
b. decreasing the temperature on $\mathrm{CO}_{2}$ gas that is held at a pressure of 20 atm
c. increasing the temperature on solid $\mathrm{CO}_{2}$ that is held at a pressure of 0.8 atm

Key Concepts

Phase Diagram

A phase diagram is a graphical representation of the equilibrium conditions between different phases of a substance, plotted as pressure versus temperature. It delineates the regions where solid, liquid, and gas phases are stable and shows the boundaries (phase transition lines) between these states. Understanding phase diagrams is fundamental to predicting how changes in pressure or temperature can prompt phase transitions.

Phase Transition

A phase transition is the process in which a substance changes from one state of matter to another, such as from a solid to a gas (sublimation) or from a gas to a solid (deposition), among other transformations. These transitions occur when a system crosses a boundary in the phase diagram, usually driven by changes in temperature or pressure.

Temperature and Pressure Effects

Temperature and pressure are critical factors that dictate the state of a substance. An increase or decrease in either parameter can shift the substance from one phase to another. Recognizing how these variables interplay is essential for predicting the outcomes of processes described in phase diagrams and for controlling phase transitions in practical applications.

Sublimation and Deposition

Sublimation is the direct transition from a solid phase to a gaseous phase without passing through the liquid stage, while deposition is the reverse process where a gas turns directly into a solid. These phenomena occur under specific conditions described in the phase diagram, particularly when the system's state changes bypass intermediate phases due to rapid changes in pressure or temperature.

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