Phase Diagrams, Exam 1 - Phase Diagrams Important Concepts...

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Phase Diagrams: Important Concepts A. What is a Phase a. Structurally homogeneous region of matter b. Physically distint region of matter having characteristic arrangement and properties that vary with temperature, pressure, and composition c. Do not confuse with “the liquid state” or “the solid state”. These are the “state of aggregation”. i. The thermodynamic state of a system is fixed by specification of certain values of composition, pressure, and temperature. B. Features of Pressure-Temperature Phase Diagram a. Triple Point (O): Here, 3 phases coexist at a fixed pressure and temperature b. Freezing Line: separates solid and liquid c. Deposition Line: separates solid and vapor d. Condensation Line: separates liquid and vapor C. Gibb’s Phase Rule a. F = C – P + 2 i. C= # of components ii. P= Number of Phases iii. Degrees of Freedom (number of variables that can be independently changed without effecting the number of phases in a system) D. Two Component Phase Systems (Binary Phase Diagram)
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Phase Diagrams, Exam 1 - Phase Diagrams Important Concepts...

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