From the given phase diagrams, the phase diagram that correlates to a substance that will sublime or melt as it is heated at 1 atm has to be identified. Concept Introduction: Phase change refers to change in physical state of a substance. If a substance undergoes change in its physical state from one physical form to another physical form, then the substance is said to be undergone phase change . Phase diagram illustrates temperature and pressure conditions at which a substance can remain stable at a certain physical state. The distinct separation between the different phases of a system is known as phase boundary .

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Chapter 12.6, Problem 12.6.1SR

(a)

Interpretation Introduction

Interpretation:

From the given phase diagrams, the phase diagram that correlates to a substance that will sublime or melt as it is heated at 1 atm has to be identified.

Concept Introduction:

Phase change refers to change in physical state of a substance. If a substance undergoes change in its physical state from one physical form to another physical form, then the substance is said to be undergone phase change.

Phase diagram illustrates temperature and pressure conditions at which a substance can remain stable at a certain physical state. The distinct separation between the different phases of a system is known as phase boundary.

(b)

Interpretation Introduction

Interpretation:

From the given phase diagrams, the one that corresponds to the substance that will liquefied when pressure is increased at temperature below its freezing point has to be identified.

Concept Introduction:

Phase change refers to change in physical state of a substance. If a substance undergoes change in its physical state from one physical form to another physical form, then the substance is said to be undergone phase change.

Phase diagram illustrates temperature and pressure conditions at which a substance can remain stable at a certain physical state. The distinct separation between the different phases of a system is known as phase boundary.

Freezing point of a substance refers to the temperature at which a liquid substance changes its phase to solid.

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