--%>
Assignment Help - homework help

Pressure Phase Diagrams

The occurrence of different phases of a one component system can be shown on a pressure temperature.

The phases present in a one line system at various temperatures can be conveniently presented on a P- versus-T diagram. An example is provided by the diagram for water for moderate pressures and temperatures. The lien labeled TC shows the pressures and temperatures of liquid and vapour exist in the equilibrium. It is a vapour-pressure curve. At temperatures higher than that of point C, the critical point, liquid vapour pressure does not occur. Therefore this liquid vapour equilibrium line finishes at C.

Consider the changes that occur as a pressure or temperature change results in the system moving in the lien TC. From point 1, for instance, the temperature can be maintained lesser to get to point 2, or the pressure can be increased to get to point 3. In either process one crosses the liquid vapour equilibrium line in the direction of consideration from the vapour to liquid. Notice, however, that if a sample phase carried from point 1 to point 2 or point 3 by a path that goes around C, no phase change will occur.

Line TB gives the temperature and pressure at such solid and vapour are in equilibrium; i.e. it is the curve for the vapour pressure of the solid line TA gives the temperatures and pressures at which ice as a function of pressure equilibrium; i.e. it represents the melting point of ice as a function of pressure. Liquid water can be cooled below its freezing point to give, as indicated by the system. It shows its existence to the fact that the rate of formulation of ice has been interfered with by the use of a very clean sample of water and a smooth container.

It is a convenient representation of all the available information about the phases of water that occurs at moderate pressures and temperatures. It shows the phase behavior of water at very large pressures. Many new phases, corresponding to ice with different crystal structures, are of common and is known as polymorphism. It is particularly remarkable that the melting point of ice VII, which exists above about 20,000 bar pressure, is over 100 degree C.

The most well-known material water that we have utilized as an illustration of P-versus-T phase diagrams is, in some ways, not at all representative. More suitable, in this regard, is one of the solid liquid equilibrium line, TA has a positive slope.

   Related Questions in Chemistry

  • Q : Describe First Order Rate Equation The

    The integrated forms of the first order rate equations are conveniently used to compare concentration time results with this rate equation. Rate equations show the dependence of the rate of the reaction on concentration can be integrated to give expressions fo

    		•
  • Q : Benefits of soapy detergents over the

    What are the benefits of soapy detergents over the soap less detergents? Briefly state the benefits?

    		•
  • Q : Diffusion Molecular View When the

    When the diffusion process is treated as the movement of particles through a solvent the diffusion coefficient can be related to the effective size of diffusing particles and the viscosity of the medium.To see how the experimental coefficients can be treat

    		•
  • Q : Strength of Nacl in solution To 5.85gm

    To 5.85gm of Nacl one kg of water is added to prepare of solution. What is the strength of Nacl in this solution (mol. wt. of nacl = 58.5)? (a) 0.1 Normal (b) 0.1 Molal (c) 0.1 Molar (d) 0.1 FormalAnswer:

    		•
  • Q : What is solvent dielectric effect?

    Ionic dissociation depends on the dielectric constant of the solvent.The Arrhenius that ions are in aqueous solutions in equilibrium with parent molecular species allows many of the properties of ionic solutions to be understood. But difficulties began to

    		•
  • Q : Molecular Properties Symmetry Molecular

    Molecular orbitals and molecular motions belong to certain symmetry species of the point group of the molecule.Examples of the special ways in which vectors or functions can be affected by symmetry operations are illustrated here. All wave functions soluti

    		•
  • Q : Vapour pressure of the pure hydrocarbons

    Give me answer of this question. A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbons at 20°C are 440 mmHg for pentane and 120 mmHg for hexane. The mole fraction of pentane in the vapour phase would be: (a) 0.549 (b)

    		•
  • Q : Group IV Cations Chromium(III)

    Chromium(III) hydroxide is highly insoluble in distilled water but dissolves readily in either acidic or basic solution. Briefly explain why the compound can dissolve in acidic or in basic but not in neutral solution. Write appropriate equations to support your answer.

    		•
  • Q : BASIC CHARACTER OF AMINES IN GAS PHASE,

    IN GAS PHASE, BASICITIES OF THE AMINES IS JUST OPPOSITE TO BASICITY OF AMINES IN AQEUOUS PHASE .. EXPLAIN

    		•
  • Q : What do you mean by the term medicine

    What do you mean by the term medicine dropper? Explain briefly?

    		•