5: Single Component Phase Equilibrium
- Page ID
- 453430
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- 5.1: Gibbs Energies and Phase Diagrams
- Gibbs energy is a continuous function as a function of temperature. The derivative, however, is discontinuous during phase changes.
- 5.3: The Gibbs-Duhem Equation
- The Gibbs-Duhem equation relates how the chemical potential can change for a given composition while the system maintains equilibrium. So for a binary system, consisting of components A and B (the two most often studied compounds in all of chemistry)
- 5.4: Criterion for Phase Equilibrium
- The thermodynamic criterion for phase equilibrium is simple. It is based upon the chemical potentials of the components in a system. For simplicity, consider a system with only one component. For the overall system to be in equilibrium, the chemical potential of the compound in each phase present must be the same.
- 5.5: A Phase Diagram Summarizes the Solid-Liquid-Gas Behavior of a Substance
- A good map will take you to your destination with ease, provided you know how to read it. A map is an example of a diagram, a pictorial representation of a body of knowledge. In science they play a considerable role. Next to plots and tables diagrams are an important means of making information and/or theoretical knowledge accessible.
- 5.6: The Clapeyron Equation
- Based on the thermodynamic criterion for equilibrium, it is possible to draw some conclusions about the state variables p and T and how they are related along phase boundaries. This results in the Clapeyron equation.
- 5.7: The Clausius-Clapeyron Equation
- The Clapeyron equation can be developed further for phase equilibria involving the gas phase as one of the phases. This is the case for either sublimation (solid → gas) or vaporization (liquid → gas).