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Importance of Physical Chemistry in Academic Curriculum
Physical chemistry plays significant role among all branches of chemistry as it inter links physics and mathematical applications with chemistry. Basically chemistry involves many types of chemical reactions which should be in balanced form for the study of effect of temperatures, energy calculations, study of Kinetics and reaction mechanisms, yield of products etc. All these studies cannot be furnished without stoichiometry. It involves measurement of rates and mechanisms of Chemical reactions and position of chemical equilibria. In many industrial processes, Lechatlier's principle is implemented for better profits and safety measures. For example, in preparation of Ammonia by Haber's process, the suitable conditions are
- Optimum temperature
- High Pressure
- Finely divided catalyst with promoter
- Maintenance of concentration of reactants and Products
All these conditions are recommended basing on Le Chatlier's principle which is the best applicable principle in most of the equilibrium reactions universally. Without the knowledge of these aspects no chemical industry will survive and all the topics mentioned above are related to Physical chemistry.
Difficulties faced by a student while solving Physical chemistry problems
The physical basis for chemical structure, reactions and dynamics ultimately described by Quantum theory, statistical mechanics and thermodynamics. For studying and understanding Physical chemistry a student needs a solid mathematical background along with basic physics fundamentals. Most of the students will start thinking the physical chemistry in quantitative manner and will try to memorize the topics without understanding the requisite concepts. This approach leads to failing in application oriented topics like thermodynamics, quantum chemistry, chemical kinetics etc. While attempting the problem part student has to gather all the formulae at one place and practice them perfectly. In physical chemistry many topics are inter linked with one another therefore, after reading the given problem, thorough data analysis must be done. After attempting any problem one has to identify conversion factors like CGS, SI systems. Many students often commit this mistake of using wrong units and finally they end up in mess. Another most important factor is to identify the prerequisite topic before going in to the core chapter. For example, if a student is attempting to solve a problem in Stoichiometry, he/she should know about equivalent weights, oxidation states, valencies etc. Similarly while attempting Electro chemistry problems he must have some idea about thermodynamic principles and their concepts. Without practicing all this no one will be comfortable with physical chemistry.
Few topics to solve problems in physical chemistry
There are many topics in physical chemistry which are problem oriented. A few are listed below
Solutions: Molarity, Normality, Molality, Mole fraction, Equivalent weights, Colligative properties, Rault's Law, Henry's law, Osmotic pressure, Elevation of Boiling points, Depression of Freezing points etc.
Electro Chemistry: Electrolysis, Faradays I law, Faraday's II law, Molar Conductance, Equivalence Conductance, Kaulrausch's law, Nernst equation, Electrode potential calculations, Cell potential calculations, Equilibrium constant and Gibb's energy calculation by using Nernst equation.
Solid State: Bragg's equation and applications, Calculation of chemical formulae, BCC, FCC, Simple cube structural formulae, Radius, Density, Distance between nearest Neighbors calculations, Number of Tetrahedral voids, and octahedral voids.
States of matter: Gas law problems, Ideal gas equation,Vander Waals equation problems, Types velocities problems, Dalton's law, Graham's law etc.
Chemical Kinetics: Calculations on activation energies, Rate of reactions, order and Molecularity of reaction
Chemical Equilibrium: Equilibrium constant Kc and Kp calculations
Thermodynamics: Heat of reactions, Entropy, Enthalpy, Gibbs Energy
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