General Descriptive Chemistry II
General Descriptive Chemistry II CHEM 102
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This 4 page Class Notes was uploaded by Jordyn Donnelly on Sunday October 25, 2015. The Class Notes belongs to CHEM 102 at University of North Carolina - Chapel Hill taught by Domenic Tiani in Fall. Since its upload, it has received 40 views. For similar materials see /class/228855/chem-102-university-of-north-carolina-chapel-hill in Chemistry at University of North Carolina - Chapel Hill.
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Date Created: 10/25/15
Chapter 10 Gases and Gas Behavior 1 Why Study Gases and Gas Behavior 11 How Do Gases Compare to Liquids and Solids III A MOLECULAR View of Gases A The Kinetic Molecular Theory KM B Postulates of The Kinetic Molecular Theory 1quot Equot M 5 Equot Gaseous atoms Ar or molecules CH4 are in constant random motion Attractive and repulsive forces between gaseous atoms or molecules are negligible Collisions are elastic The volume of gas atoms or molecules is negligible compared to the total volume The average kinetic energy of a gas depends only on the temperature of the gas C Molecular Speed and Kinetic Energy KE afGas Molecules 1 The Effect of Temperature on Molecular Speed 0 Experimentally the following is observed Fraction of molecules within Fraction of m lecules vx 100 C 10 ms of indicated speed 5 x 10 10 X 102 Molecular speed ms commammmm wzvmannu m 2 The Effect of Molar Mass on Molecular Speed merimentallx the following is observed 39U B 02 u quot393 VNZ quot3 3 20 f 119 0 Q 39 1712 g 39 5 x 102 10 x 102 15 gtlt102 20 x 102 25 gtlt1IJz 30 x102 35 x102 Molecular speed ms Copyright 2005 Pearson Prenllce Han inc D Diffusion and E usian a Diffusion E b Effusion E c Graham s Law Thomas Graham 1846 Uranium Ore gt 235UF6 and 238UF6 gt Gas Effusion 235U 072 238U 99275 Centrifugation IV MACROSCOPIC View Behavior of Gases A Gas Pressure 1 Definition E Pressure Force Area 2 The Measurement of Gas Pressure a The Barometer b The Manometer 3 Units of Pressure amp Conversions between Various Gas Pressure Units 1 atm 760 mm Hg 760 torr 1 mm Hg 1 torr 1 atm 101325 kPa 1 bar 105 Pa 1 Pa Nm2 1 N 1 kg m s2 V Early Experimental Observations of Gas Properties and Behavior 1 Boyle s Law Sir Robert Boyle British 1661