APSU CHEM 3610 - Gases (10 pages)

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Gases



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Gases

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Lecture Notes


Pages:
10
School:
Austin Peay State University
Course:
Chem 3610 - Physical Chemistry

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Gases Chapter 1 Ron Robertson a c files courses 3610 ch1trans doc Overview I What is physical chemistry II Some meanings of the term state III Kinetic theory and the ideal gas IV Real gases for real people Gases Slide 1 I What is physical chemistry A The study of the underlying principles that govern the behavior of chemical systems B 2 views microscopic use of molecules macroscopic large scale properties without the use of molecules C Areas Thermodynamics relationships among the various equilibrium properties of a system Quantum mechanics new set of laws which govern motions of molecules atoms electrons and nuclei The study of spectroscopy is derived from this Gases Slide 2 Statistical mechanics relates the macroscopic to the microscopic Allows the calculation of macro properties form the micro Kinetics study of reaction rate uses parts of thermo quantum mechanics and stat mech Gases Slide 3 II Some meanings of the term state A States of matter solid liquid gas or B A description of a sample of matter in terms of macroscopic variables V P T and n 1 volume m3 ft3 liters ml 2 pressure Force area direct lb in2 N m2 or Pa bar 1 bar 105 Pa indirect Atmosphere mm Hg or torr in of Hg Conversions Old Standard Pressure 14 7 lb in2 760 mm Hg or torr 101 3 kPa 1 013 bar 1 00 Atm 29 9 in of Hg New definition of standard pressure is exactly 1 bar Gases Slide 4 3 Temperature measure of average KE Gives an indication of energy flow no energy flow means thermal equilibrium same temp Celsius Fahrenheit Kelvin Rankine K C 273 R F 460 C 5 9 F 32 F 9 5 C 32 4 Number of particles the mole 1 mole 6 02 x 1023 particles allows conversions g moles Gases molecules Slide 5 C Equations of state 1 V P T and n are not independent Once we specify 3 the other is already determined The equation of state relates these variables 2 The equation of state is not known for most substances because of complicated interactions but the equation for low pressure gases is Gases Slide 6 III Kinetic Theory and



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