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HomeHomework HelpchemistryPhase Diagrams and Equilibrium

Phase Diagrams and Equilibrium

The study of phase diagrams, which illustrate the equilibrium states of a system as a function of temperature, composition, and other variables, and the analysis of the stability and equilibrium of different phases, including liquids, solids, and mixtures, in terms of Gibbs free energy and other thermodynamic properties

intermediate
3 hours
Chemistry
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Overview

Phase diagrams are essential tools in understanding the behavior of substances under varying conditions of temperature and pressure. They visually represent the different phases—solid, liquid, and gas—and the transitions between them, providing insights into material properties and stability. Unders...

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Key Terms

Phase
A distinct form of matter with uniform properties.

Example: Water exists in three phases: solid (ice), liquid (water), and gas (steam).

Phase Diagram
A graphical representation showing the phases of a substance at various temperatures and pressures.

Example: The water phase diagram illustrates the conditions for ice, water, and steam.

Equilibrium
A state where the forward and reverse processes occur at the same rate.

Example: In a closed container, water can evaporate and condense at equilibrium.

Critical Point
The temperature and pressure at which a substance's liquid and gas phases become indistinguishable.

Example: Above the critical point, carbon dioxide cannot be liquefied.

Triple Point
The unique set of conditions where all three phases of a substance coexist in equilibrium.

Example: The triple point of water occurs at 0.01°C and 611.657 pascals.

Le Chatelier's Principle
A principle stating that if a system at equilibrium is disturbed, it will shift to counteract the disturbance.

Example: Adding more reactants shifts the equilibrium to produce more products.

Related Topics

Chemical Equilibrium
Study of the balance between reactants and products in a chemical reaction.
intermediate
Thermodynamics
The study of energy, heat, and work in physical and chemical processes.
intermediate
Colligative Properties
Properties that depend on the number of solute particles in a solution.
intermediate

Key Concepts

Phase ChangesEquilibrium StateCritical PointTriple Point