Battle of the Theories: Valence-Bond vs. Molecular-Orbital

Submitted by Patrick Holland / Yale University on Mon, 07/28/2008 - 10:04
Description

This Challenge practices both VB and MO models, and can be used to show the superiority of MO models for explaining simple molecules like O2 and CH4. It also demonstrates how scientists make rational choices between theories. Inorganic Challenges are exercises designed to be solved by a small group of students. Some Challenges practice a problem-solving algorithm, some reinforce important concepts, and some involve creativity or games.

Inorganic Challenge: Lewis structures and VSEPR

Submitted by Patrick Holland / Yale University on Mon, 07/28/2008 - 09:36
Description

This is an Inorganic Challenge that gives students an opportunity to practice the algorithm for difficult Lewis structures, and using good problem-solving technique. Inorganic Challenges are exercises designed to be solved by a small group of students. Some Challenges practice a problem-solving algorithm, some reinforce important concepts, and some involve creativity or games.

Oliver Sacks' "Uncle Tungsten" and inorganic chemistry

Submitted by Joanne Stewart / Hope College on Fri, 07/18/2008 - 21:32
Description

Students read Oliver Sacks' autobiography "Uncle Tungsten" and take turns writing chapter summaries and discussion questions. Some chapters focus on Sacks' childhood chemical explorations and others on the historical period of his youth. In the summary, students are asked to either explain the chemistry in contemporary terms OR explain the context (what was going on in the world) of the historical pieces.

Werner From Beyond the Grave

Submitted by Maggie Geselbracht / Reed College on Mon, 06/09/2008 - 19:11
Description
This short communication in 2001 established the structure of a dinuclear cobalt complex based on a single crystal X-ray diffraction study of crystals taken from the Werner collection. The X-ray structure clarified the nature of the bridging ligands including a bridging superoxo group. As such, it offers a nice entry point into the nomenclature of bridging ligands, a discussion of O2 related ligands such as peroxide and superoxide, and the evolution of characterization techniques from Werner's time to the present.

Fivefold Bonding in Cr(I) Dimer

Submitted by Maggie Geselbracht / Reed College on Thu, 04/17/2008 - 19:47
Description

This paper describes the synthesis and characterization of a Cr(I) dimer with a very short Cr-Cr distance.  Computational studies support fivefold bonding between the chromium atoms.  I have used this paper to introduce metal-metal multiple bonds and discuss the molecular orbital interactions of homonuclear diatomics including d-orbitals.  More generally, it is a nice example to stimulate the discussion of what constitutes a bond and the various interpretations of bond order.

Main group element paper and presentation

Submitted by Joanne Stewart / Hope College on Wed, 04/02/2008 - 23:19
Description
Students research an application of one of the main group elements and prepare a paper, a short in-class presentation, and a test question. This provides the class with a survey of the main group elements and their practical applications. This assignment addresses two learning goals: 1) to study the chemistry of the main group elements and 2) to learn about the role inorganic chemistry plays in other disciplines of chemistry. In addition, students work on the goal of improving writing and oral communication skills.

Atomic orbitals brainstorm

Submitted by Joanne Stewart / Hope College on Wed, 04/02/2008 - 23:04
Description

This is a beginning-of-semester "warm up." The goals are to help students reconnect to their prior knowledge about atomic orbitals and to introduce and practice the fundamentals of good small group work.

Solid-state model building exercise

Submitted by Joanne Stewart / Hope College on Wed, 04/02/2008 - 22:52
Description

Students construct models of ionic solids in class and answer a series of questions about the structures.

Student autobiographies

Submitted by Joanne Stewart / Hope College on Wed, 04/02/2008 - 22:26
Description

The students write a 2-page chemistry autobiography at the beginning of the semester in order to reflect on their previous chemistry learning experiences, express their expectations for the class, and help me get to know them.