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Rare Gas Viscosities: A Learning Tool

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Arthur M. Halpern

Department of Chemistry, Indiana State University, Terre Haute, IN 47809

J. Chem. Educ., 2002, 79 (2), p 214

DOI: 10.1021/ed079p214

Publication Date (Web): February 1, 2002

Section:

History, Education, and Documentation

Abstract

The viscosities, η, of the rare gases and SF₆ are determined in a physical chemistry laboratory experiment using the evacuation method, which is based on Poiseuille's equation. Students become aware that η does not vary monotonically with row number (or atomic mass) and confirm this behavior on the basis of the kinetic theory expression for η. They find that the collision diameters of the gases, σ, which are obtained from η values, increase monotonically with molar mass, as expected. Students can show that values of σ obtained from gas viscosities agree reasonably well with ab initio calculations of atomic (molecular) diameters using Gaussian 98W.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Gases

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

Modern Developments in the Physical Chemistry Laboratory
Samuel A. Abrash
2007 973 (), 115-151
- Modern Developments in the Physical Chemistry Laboratory
  Samuel A. Abrash
  2007 973 (), 115-151
  Developments in the physical chemistry laboratory since the publication of the germinal text by Schwenz and Moore (1) are categorized and reviewed. The categories examined include modern instrumentation, current topics in chemistry, integrated ...
  Abstract | Hi-Res PDF | PDF w/ Links
Temperature Dependence of Viscosities of Common Carrier Gases
Trent S. Sommers and Tal M. Nahir
Journal of Chemical Education2005 82 (7), 1089
- Temperature Dependence of Viscosities of Common Carrier Gases
  Trent S. Sommers and Tal M. Nahir
  Journal of Chemical Education2005 82 (7), 1089
  The temperature dependence of gas viscosities deviates significantly from the rigid-sphere model prediction of T1/2. A better relationship of Tx, where x > 1/2, is described on the basis of two theoretical approaches. A simple measurement, which could be ...
  Abstract | Hi-Res PDF | PDF w/ Links