Definitions [1]
Define phase ,component and degree of freedom.
1. PHASE: A phase is defined as any homogenous, physically distinct and mechanically separable portion of a system, which is separated from other parts of the system by definite surface. Example:-
• In a freezing water system ice, water and water vapour are the three phases which are
physically distinct and homogenous.
2. COMPONENT: It is the smallest number of independent variable constituents taking part in
the state of equilibrium, by means of which the composition of each phase can be
expressed in the form of chemical equation .Example:-
• In water system the phases present are ice, water and water vapour. The composition of each phase can be expressed by a single component, H20 . Hence it is a one component system.
3. DEGREE OF FREEDOM: It is defined as the smallest number of independent variables such as pressure, temperature and concentration that must be specified in order to define completely the state of a system. Example:
• For a system consisting of water in contact with its vapour,
`" Watert"_I↔"Water vapourg"_g`
To define it completely, we have to state either temperature or pressure. Hence, the system is univariant or degree of freedom is one .
Important Questions [19]
- What is the Mathematical Form of the Gibbs Phase Rule Equation? Explain the Meaning of Each One of the Term Involved in It.
- Explain the term 'phase' with appropriate examples.
- State the Condensed Phase Role.
- What is the Application of Phase Rule to One Component Water System? Explain with the Help of Diagram.
- Define Phase I Component and Degree of Freedom.
- What is Meant by Triple Point? Apply Phase Rule and Find Degree of Freedom for Triple Point.
- State the Number of Phases I Component for the Following Equilibrium I) H2o(S) ↔ H20(L) ↔ H20(G) Ii)Mixture of Rhombic and Monoclinic Sulphur.
- Discuss the Application of Phase Rule to the One Component System Based On: Diagram , Triple Point
- Draw the Phase Diagram of One Component System and Find Out the Number of Degree of Freedom Along the Curves and Areas .
- Draw and Explain Important Features of Phase Diagram of Water System.
- Discuss triple point in one component system
- Define A) Phase B) Component C) Degree of Freedom
- What is reduced phase role?
- What is Reduced Or Condensed Phase Rule.
- Explain the Reduced Phase Rule.
- What is reduced phase rule"? Draw the phase diagram of the Ag-Pb system with proper labelling.
- State the Limitations of Phase Rule?
- Discuss the Advantage and Limitations of the Phase Rule .
- What are the limitations of Phase rule?
