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The Liquid Nitrogen Cloud

Tom Kuntzleman | Fri, 07/26/2019 - 10:42

Have you ever seen the liquid nitrogen cloud? Do you wonder how the cloud forms when hot water is thrown onto liquid nitrogen? This post explores the liquid nitrogen cloud and possible explanations for its formation.

Revisiting the Rainbow Safety Alert

Deanna Cullen | Wed, 07/17/2019 - 10:07

The American Chemical Society's Committee on Chemical Safety has reached out once again asking that the larger community share the warning about using the Rainbow Demonstration. They want to spread the word about the dangers of the Rainbow Flame Demonstration so no further injuries occur. 

Oxidation Argumentation Activity

Stephanie O'Brien | Mon, 07/08/2019 - 14:19

I facilitate a working group of chemistry teachers in the New York area and we recently created our own activity surrounding the topic of oxidation. The goal of the probe was to force students to think about what the meaning of oxidation is, as well as to allow students to engage in the science and engineering practice of argumentation. This was an introductory lesson to my oxidation and reduction unit prior to students learning the terms oxidation and reduction.

M&Ms as Isotopes

Estelle Lebeau | Thu, 07/04/2019 - 13:34

Use Mega M&Ms, M&Ms minis, and regular M&M’s in this activity to examine the concept of isotopes and average atomic mass. The color of the M&M’s represent that they are the same element and have the same number of protons. The size represents, in a relative sense, the different numbers of neutrons.

Measuring Surface Tension to Investigate Intermolecular Forces

Ben Meacham | Fri, 05/31/2019 - 22:38

Like most concepts in chemistry, intermolecular forces takes a bit of imagination and critical thinking to fully comprehend and apply when explaining a variety of situations. Though demonstrating the presence of these forces in a simple and explicit manner can easily be done, I wanted to change how I introduced IMFs a bit this year by focusing on a more data-to-concepts approach.