Generating LGOs (SALCs)

Submitted by Adam Johnson / Harvey Mudd College on Fri, 01/04/2008 - 19:12
Description

    After several days of lecturing on the topic of polyatomic molecular orbital diagrams, students break into small groups of 3-4 and form LGO’s that can be used to interact with a central atom to form a Molecular Orbital (MO) diagram.  This assignment is part of a larger 4-5 week unit on MO theory. 

Symmetry Scavenger Hunt

Submitted by Lori Watson / Earlham College on Sat, 11/17/2007 - 18:35
Description

Students are sent to find (and take pictures) of  items in various point groups around campus.  Generally, I give them a list of possible offices (though they are free to go to other places) and point groups (some hard) and the following ground rules:

 

Determining Molecular Structure: An Experimental Simulation of X-ray Diffraction

Submitted by Maggie Geselbracht / Reed College on Sat, 11/17/2007 - 16:53
Description
­This activity introduces students to the symmetries of 2-D repeating patterns and X-ray diffraction. Using small lasers and Optical Transform slides (available from the Institute for Chemical Education), students qualitatively and quantitatively investigate the relationships between the sizes and symmetries of unit cells and the effects observed in diffraction patterns.

The N5+ Cation: Explosive Chemistry and Raman Analysis (Christe)

Submitted by Maggie Geselbracht / Reed College on Sat, 11/17/2007 - 13:18
Description

­This paper discusses the synthesis and characterization of a novel compound of nitrogen.  The pre-discussion assignment asks students draw a Lewis structure for the N5+ cation, and using the tools of group theory, conduct a normal mode vibrational analysis, comparing the results to the experimental Raman spectral data.­­