part 24: PHASE DIAGRAM

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23 Terms

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Phase Diagram

Represents the states of matter that exists as temperature and pressure varied

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<p><strong>Melting curve/Freezing curve</strong></p>

Melting curve/Freezing curve

AD

<p>AD</p>
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<p><strong>Sublimation/Deposition curve</strong></p>

Sublimation/Deposition curve

AC

<p>AC</p>
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<p><strong>Vaporization/Condensation curve</strong></p>

Vaporization/Condensation curve

AB

<p>AB</p>
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Critical Temperature

Temp beyond w/c liquid will no longer exist

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Critical Fluid

  • System that will exist beyond critical temperature and critical pressure

  • Used in decaffeination of coffee

  • Partly liquid and gas in character

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Gibbs Phase Rule

Phase Rule is also known as?

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Phase Rule

  • Is a relationship for determining the least number of independent variables (e.g., temperature, pressure, density, and concentration) that can be changed without changing the equilibrium state of the system

  • The number of variables that may be changed independently without causing the appearance of a new phase or disappearance of an existing phase

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F=C-P +2

Wheras:

F: the number of degrees of freedom of the system (number of independent variables (e.g. temperature, pressure, and concentration) that may affect the phase equilibrium)

C: number of components

P: number of phases

Formula of Phase Rule

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2

Determine the degrees of freedom of a system containing either ice, water or water vapour

A. 1

B. 2

C. 3

D. 0

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1

What is the degree of freedom for a system containing a water in equilibrium with its vapour A. 1

B. 2

C. 3

D. 0

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0

Assuming that we have system wherein ice-water-water vapour are in equilibrium. What will be the degrees of freedom of the system.

A. 1

B. 2

C. 3

D. 0

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1 phase

Number of phases of Gas, Liquid, or Solid system

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2

Degrees of Freedom of Gas, Liquid, or Solid system

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Bivariant

2 Degrees of Freedom

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2 phases

Number of phases of Gas-Liquid, Liquid-Solid or Gas-Solid system

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1

Degrees of Freedom of Gas-Liquid, Liquid-Solid or Gas-Solid system

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Univariant

1 Degree of Freedom

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3 phases

Number of phases of Gas-Liquid-Solid system

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0

Degrees of Freedom of Gas-Liquid-Solid system

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Invariant

0 Degrees of Freedom

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Increases

As the number of components INCREASES, the degrees of freedom _______________

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Decreases

As the number of phases INCREASES, the degrees of freedom _______________