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HomeHomework HelpthermodynamicsFree Energy Diagrams

Free Energy Diagrams

Graphical representations of the free energy of a system as a function of its composition, used to analyze and predict the stability of different phases and phase transformations in binary systems, taking into account the enthalpy, entropy, and temperature of the system

intermediate
3 hours
Thermodynamics
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Overview

Free energy composition diagrams are essential tools in thermodynamics that illustrate the stability of different phases of a system based on composition and temperature. By analyzing these diagrams, students can gain insights into phase transitions, chemical reactions, and material properties, whic...

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Key Terms

Gibbs Free Energy
A thermodynamic potential that measures the maximum reversible work obtainable from a system at constant temperature and pressure.

Example: G = H - TS, where H is enthalpy, T is temperature, and S is entropy.

Phase Transition
The transformation of a substance from one phase to another, such as solid to liquid.

Example: Melting ice into water is a phase transition.

Chemical Potential
The change in free energy of a system when an additional particle is introduced.

Example: In a mixture, the chemical potential helps determine the direction of phase changes.

Thermodynamic Stability
A state where a system is at equilibrium and will not change unless disturbed.

Example: A stable phase in a free energy diagram is represented by a local minimum.

Equilibrium
A state where the rates of forward and reverse processes are equal, resulting in no net change.

Example: In a saturated solution, the rate of dissolution equals the rate of crystallization.

Enthalpy
A measure of the total energy of a thermodynamic system, including internal energy and energy associated with pressure and volume.

Example: The enthalpy change during a reaction can indicate whether it is exothermic or endothermic.

Related Topics

Thermodynamic Cycles
Study of processes that involve energy transfer and conversion in thermodynamic systems.
intermediate
Chemical Equilibrium
Understanding the state where the concentrations of reactants and products remain constant over time.
intermediate
Phase Separation
The process where a homogeneous mixture separates into distinct phases.
advanced

Key Concepts

Gibbs Free EnergyPhase EquilibriumChemical PotentialThermodynamic Stability