Introduction to Pulsed Gradient Spin Echo DOSY

Submitted by Jacob Lutter / University of Southern Indiana on Thu, 02/08/2018 - 14:35
Description

Pulsed Gradient Spin Echo (PGSE) DOSY is a NMR technique used for determining the hydrodynamic radius of a molecule in solution by measuring the rate of diffusion. This technique requires a standard, usually tetrakis(trimethylsilyl)silane (TMSS). This activity will cover the basics of how PGSE works and includes built in animations to demonstrate how the nuclear magnetization is affected. Each slide has comments explaining the content for the user's convenience.

Visual scaffold for stoichiometry

Submitted by Margaret Scheuermann / Western Washington University on Tue, 12/19/2017 - 22:18
Description

These five slides are intended to share a visual scaffolding that I developed to help my general chemistry students identify what calculations are needed to solve stoichiometry problems.

 

KINETICS - Computations vs. Experiment

Submitted by Teresa J Bixby / Lewis University on Sat, 03/25/2017 - 12:10
Description

<p>This activity has students use Spartan to build an energy diagram for an SN2 reaction as a function of bond length. The activation energy can then be used to determine the rate constant for the reaction. After a few intoductory questions to orient general chemistry students to the organic reaction (with a short class discussion), the instructions lead them step-by-step to build the energy diagram for CH&lt;sub&gt;3&lt;/sub&gt;Cl + Cl- --&gt; Cl- + CH&lt;sub&gt;3&lt;/sub&gt;Cl.

calistry calculators

Submitted by Adam Johnson / Harvey Mudd College on Wed, 01/18/2017 - 18:17
Description

I just stumbled on this site while refreshing myself on the use of Slater's rules for calculating Zeff for electrons. There are a variety of calculators on there including some for visualizing lattice planes and diffraction, equilibrium, pH and pKa, equation balancing, Born-Landé, radioactive decay, wavelengths, electronegativities, Curie Law, solution preparation crystal field stabilization energy, and more.

I checked and it calculated Zeff correctly but I can't vouch for the accuracy of any of the other calculators. 

Chapter 2--Stanley Organometallics

Submitted by George Stanley / Louisiana State University on Mon, 06/20/2016 - 12:57
Description

Chapter 2 from George Stanley's organometallics course, Lewis Base ligands

 

this chapter covers halides, oxygen and nitrogen donor ligands

The powerpoint slides contain answers to some of the in-class exercises, so those are behind the "faculty only" wall. I share these with students after the class, but not before.

Everyone is more than welcome to edit the materials to suit their own uses, and I would appreciate being notified of any mistakes that are found.


Mix and Match Ligand Group Orbitals and Metal Orbitals

Submitted by samuelson / Indian Institute of Science on Thu, 03/31/2016 - 00:34
Description

Students are often presented with the finished MO correlation diagrams of molecules like bis benzene chromium or ferrocene in classes and in organometallic chemistry text books. This activity helps them match the ligand group orbitals of the two benzene rings with the metal valence orbitals. Their understanding and appreciation of such diagrams is significantly enhanced when they find out how only some matches have the appropriate symmetry requirements.