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Fractional Distillation of Air and Other Demonstrations with Condensed GasesMaria Oliver-Hoyo and William L. Switzer, III This demonstration builds upon the commonly performed liquefaction of air not only to show the presence of nitrogen and oxygen, but also the presence of two other components, carbon dioxide and water. Several extensions are suggested: one to show boiling point elevation in solution and another to show the elevation of both boiling point and sublimation point with pressure. No special apparatus is required permitting presentations to audiences in a variety of settings. These demonstrations give the opportunity to discuss properties of gases, solution chemistry, and phase equilibria. Oliver-Hoyo, Maria; Switzer, William L., III. J. Chem. Educ.2005, 82, 251.
Gases |
Qualitative Analysis |
Atmospheric Chemistry |
Phases / Phase Transitions / Diagrams |
Separation Science
Nitrogen: It Always Needs a FixKathryn R. Williams The fixation of nitrogen was a popular topic in early issues of the Journal of Chemical Education. This column, From Past Issues, briefly summarizes articles on the nonbiological methods for nitrogen fixation. Williams, Kathryn R. J. Chem. Educ.2005, 82, 194.
Industrial Chemistry |
Agricultural Chemistry
The Formula for Ammonia MonohydrateStephen J. Hawkes The reality of NH4OH was argued in J. Chem. Educ. and elsewhere a decade ago. Further evidence is now available. My colleague Darrah Thomas has calculated the geometry and bond lengths of H5NO using Gaussian. The calculation was done using the D95 basis set and the B3LYP method. Hawkes, Stephen J. J. Chem. Educ.2004, 81, 1569.
Nitric Oxide-Releasing CompoundsWilliam F. Coleman, Randall J. Wildman The five WebWare Molecules for December derive from the article Nitrogen-Based Diazeniumdiolates: Versatile Nitric Oxide-Releasing Compounds for Biomedical Research and Potential Clinical Applications by Joseph E. Saavedra and Larry K. Keefer.
Medicinal Chemistry
Nitrogen Volume 03, issue 07 of a series of leaflets covering subjects of interest to students of elementary chemistry distributed in 1929 - 1932.
Industrial Chemistry |
Agricultural Chemistry
The Phosphorous Family Volume 03, issue 11 of a series of leaflets covering subjects of interest to students of elementary chemistry distributed in 1929 - 1932.
