Visual scaffold for stoichiometry

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

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.


Inorganic Nomenclature: Naming Coordination Compounds

Submitted by Gary L. Guillet / Georgia Southern University Armstrong Campus on Mon, 07/31/2017 - 15:23

I do not like to take a large amount of time in class to cover nomenclature of any kind, though I want students to know the names of common ligands and the basic ideas of how coordination complexes are named.  Since it is a systematic topic I assign this guided inquiry worksheet.  I guess I think about it like learning rules for a new board game, sometimes you just have to play and learn as you go.  This assignment is meant to establish teh basica rules for naming by guiding students through what the needs are in naming, then it allows them to identify the convetions from a list of structur

Literature Discussion of "A stable compound of helium and sodium at high pressure"

Submitted by Nicole Crowder / University of Mary Washington on Sat, 06/03/2017 - 11:26

This paper describes the synthesis of a stable compound of sodium and helium at very high pressures. The paper uses computational methods to predict likely compounds with helium, then describe a synthetic protocol to make the thermodynamically favored Na2He compound. The compound has a fluorite structure and is an electride with the delocalization of 2e- into the structure.

This paper would be appropriate after discussion of solid state structures and band theory.

The questions are divided into categories and have a wide range of levels.

Formulas and Nomenclature of Compounds

Submitted by Sarah Shaner / Southeast Missouri State University on Sun, 03/26/2017 - 12:41

Students will be given the formula for a cation or anion on a slip of paper or index card. He or she will find another student with an ion with the opposite charge and practice writing the formula and naming the ionic compound that would result by combining the cation and anion. Students also answer a few questions about naming and formulas of binary molecular compounds with their partner.

KINETICS - Computations vs. Experiment

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

<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.

Experimenting with Danger- CSB safety Video

Submitted by Sheila Smith / University of Michigan- Dearborn on Thu, 03/02/2017 - 12:19

This 2011 video by the Chemical Safety Board is a very serious and moving motivation for adopting safe practices in the chemical laboratory.  It focuses on two recent and very real safety issues in University labs (UCLA, 2008 and TTU, 2010 ), both of which have shaken the educational research community to result in positive change. 

I have shared a "SafeShare" link so that you will not have to listen to ads, and if you choose to play the link in your classroom, you will not see all the Youtube ads on the screen.  

calistry calculators

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

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.