Understanding phase diagrams of solid state alloys: Application to archeological studies

Submitted by Lee Park / Williams College on Sat, 06/25/2011 - 13:43
Description
This paper from the Journal of Archeological Science describes the analysis of silver-copper artifacts found in Machu Picchu.  The archeological samples were compared to various control samples prepared from different compositions and under varying processing (thermal treatment) conditions.  Using analytical methods (mechanical hardness testing, micrographic analysis of microstructure and morphology, elemental analysis), researchers were able to offer hypotheses concerning the source materials and fabrication methods used by Inca artisans.

Periodic trends in atomic size and electronegativity based on MO calculations

Submitted by Rob Scarrow / Haverford College on Sat, 06/25/2011 - 13:38
Description

In Haverford College's course Chem 111:Structure and Bonding, we have included a workshop exercise that guides students through their first experience using electronic structure calculations.  We use the WebMO interface along with Gaussian03, but the exercise could be adapted for other electronic structure programs. The general structure of the exercise is as follows:

Synthesis of Zinc Oxide Nanoparticles and Characterization by Powder X-ray Diffraction

Submitted by Catherine Oertel / Oberlin College on Sat, 06/25/2011 - 13:16
Description

I designed this lab experiment to introduce students to the uses of powder X-ray diffraction in the context of the synthesis of a technologically relevant material. Zinc oxide nanoparticles can be synthesized readily with reagents that are inexpensive and relatively benign with regard to student use and waste disposal. Two experiments described in J. Chem.

Spectroscopy Tutorial

Submitted by Adam Johnson / Harvey Mudd College on Tue, 03/22/2011 - 23:28
Description

I just found this neat little web-based tutorial at the University of Alberta.  It goes through UV-Vis, IR and NMR.  Its coverage of IR is almost exactly what I expect my students to know.  In typical "stretch and release" fashion, I teach more, but if my students could do the practice problems on the website, I'd be happy.

The site was put together by Greg Nilsson, Enrico Fok, June Ng and Jason Cooke of the Department of Chemistry.

There are also has some great problems for multinuclear NMR.

The site has a tutorial, practice problems, and live feedback.  Way cool!

The [XeF]+ Cation and Ion-Pairing in [MF6]– and [M2F11]– Salts (M = As, Sb, Bi)

Submitted by Maggie Geselbracht / Reed College on Sat, 03/19/2011 - 17:53
Description

This Lewis structure and VSEPR problem is based on a paper from Inorganic Chemistry in 2010 reporting the crystal structures of a series of salts of the [XeF]+ cation.  The [MF6] and [M2F11] anions (M = As, Sb, Bi) were used as counterions, and in all cases, the [XeF]+ cation interacts with the anion via a weak bond between the Xe and a fluoride of the anion to form an ion-pair in the crystalline solid.  These somewhat unusual ions provide an interesting application of the predictive powers of Lewis stru

The Extremely Explosive Carbonyl Diazide Molecule

Submitted by Maggie Geselbracht / Reed College on Sat, 03/19/2011 - 17:03
Description

This Lewis structure and VSEPR problem is based on a paper from Inorganic Chemistry in 2010 reporting the crystal structure of the carbonyl diazide molecule.  This relatively simple molecule provides an interesting application of the predictive powers of Lewis structures and VSEPR theory to molecular structure, backed up by experimental data on bond distances and bond angles.  Before tackling carbonyl diazide, the students warm up by considering the structures of hydrogen azide and the isolated azide ion.  The reference to the original paper is

Communication-style lab reports

Submitted by Rebecca M. Jones / George Mason University on Mon, 03/14/2011 - 15:52
Description

For the past four years, I have required my inorganic students to write short 3-page formal lab reports in the form of communication to the Journal of the American Chemical Society.  This exercise has relieved some of the stress on my students who are writing reports of other science classes and simplified my grading.  Using Jeffrey Kovac's Writing Across the Chemistry Curriculum: An Instructor's Handbook as a starting point, I have developed a rubric to provide qualitative feedback to the stu

Metals and Life by Eleanor Crabb and Elaine Moore

Submitted by Amanda Reig / Ursinus College on Tue, 02/22/2011 - 08:27
Description

This appears to be an excellent introductory text for bioinorganic chemistry.  The authors assume no previous biochemistry knowledge and only a cursory understanding of concepts in inorganic chemistry is required.  Any student who has completed general chemistry should find most of the book readily accessible. 

Synthesis and characterization of 12-tungstosilicic acid - a modification

Submitted by Randall Hicks / Wheaton College on Mon, 11/15/2010 - 23:25
Description
This lab experiment is an update on the synthesis of the title acid. An account of this synthesis can be found in William Jolly's book, The Synthesis and Characterization of Inorganic Compounds. The synthetic procedure is reliable and was retained. However, I modified some content and added components to extend to a two-week experiment. This lab now covers the synthesis, an acid-base titration with error analysis, and the use of TGA to complement the titration results.

A really neat periodic table

Submitted by John Gilje / James Madison University on Fri, 11/12/2010 - 09:20
Description

A really neat interactive periodic table