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Deanna Cullen's picture

Floating Squares

Tue, 06/03/2014 - 13:00 -- Deanna Cullen
floating squares

I was looking for a new demonstration to initiate a discussion about polarity and related properties to use as part of an exam review. I found a video at ChemEd X (this is part of a ChemEd X subscription). It is entitled “Floating Squares – Hexane and Water” (see note below). I have placed both solutions together before, but I had not added the squares. The demonstration fulfilled my needs. I could have used the original video and muted it if I had not had hexane to demonstrate with.

Erica Jacobsen's picture

Seeing Is Not Believing

Mon, 06/02/2014 - 16:35 -- Erica Jacobsen

“It sort of started to look kind of like a very pale blue.”

A friend who teaches at the middle school level told me about a science experiment he’d done with his students. The procedure suggested to students that a particular solution would turn blue, but also asked them to write down what they saw happen. The thing was, it wasn’t actually designed to turn blue.

Lowell Thomson's picture

Reflections on a (Virtual) Guest Speaker Visit to my Chemistry Class

Sat, 05/31/2014 - 22:57 -- Lowell Thomson

I've mentioned previously that my current grade 10 class is reading "The Case of the Frozen Addicts" together. As my students starting writing their blogs to respond to the reading, I saw quite a few questions that I couldn't answer. But I didn't want to leave the questions there with no response, so I went to Twitter to find scientists to join my class as a guest speaker.

Deanna Cullen's picture

How do you teach "entropy" to high school students?

Wed, 05/07/2014 - 11:49 -- Deanna Cullen

I was recently drawn to an article published ASAP in JCE entitled Application of the Second Law of Thermodynamics To Explain the Working of Toys. Erick Castellon wrote the article highlighting the use of three toys that are used to help students develop an understanding of the second law of thermodynamics and entropy by having them observe the working of the toys and the energy transfers that occur while playing with them. I already had two of the toys, the radiometer and the drinking bird. I ordered the stirling engine from the link provided in the supporting information. As I waited for the stirling engine to arrive from Japan (which was only a few days) I attempted to write an activity to guide my students to conceptual understanding as they worked with the toys.

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