Solution to Chemical Mystery #11: Too Hot to Boil?
Tom Kuntzleman | Tue, 03/06/2018 - 09:26
The solution to Chemical Mystery #11, which involves the Leidenfrost Effect, is presented.
thermochemistry
Solution to Chemical Mystery #10: Out of the Blue!
Tom Kuntzleman | Wed, 07/05/2017 - 09:30
In Chemical Mystery #10, plastic straws are observed to “magically” change color when waved in the air. Check out the explanation and the video.
Chemical Thinking Interactives
Kaleb Underwood | Tue, 07/04/2017 - 15:52
As part of a two-week Chemistry Modeling Workshop™ in Houston, TX, I had the opportunity to read the Journal of Chemical Education article “When Atoms Want” by Vicente Talanquer of the University of Arizona. I researched Dr. Talanquer and discovered he created a collection of simulations called Chemical Thinking Interactives (CTI). These digital tools illustrate many chemistry topics with a focus on the particulate nature of matter.
Demonstration: Reaction of Magnesium and Silver Nitrate
Kaleb Underwood | Tue, 05/02/2017 - 08:55
I found a version of this demonstration online a couple of years ago. I admit, when I first tried it with my class it was mostly for a crowd pleaser to demonstrate the activity series of metals, but I then became very intrigued by the processes occurring. The original source only referenced the “single replacement reaction” between Mg(s) and AgNO3(aq). Therefore, when I saw a grayish product (silver) I was not surprised. However, I was surprised by the white flash and the production of a white product, which were reminiscent of the classic combustion of magnesium demonstration. This led to some research and my conclusions that follow. Read through to the end and you will find a video of the demo.
Chemical Mystery #9: Liquid Nitrogen vs. Dry Ice
Tom Kuntzleman | Thu, 01/12/2017 - 07:20
A 2L soda pop bottle is filled about one-third full with either liquid nitrogen or solid carbon dioxide (dry ice) and water. The bottle is sealed and a plastic bucket is placed on top. Do you think the liquid nitrogen or dry ice and water will make the bucket go higher? Can you explain the results using chemistry?
Big Ideas in AP Chemistry: Connections Among Thermodynamics and Equilibrium
Tracy Schloemer | Sat, 10/08/2016 - 17:52
I have a confession: thermodynamics is not my strong suit. The data set I got from the College Board confirmed my lack of confidence in the summer of 2015. With the hope of improvements, I spent some time revamping my thermo unit and I implemented it near the end of last school year. I will share an activity that I feel was quite formative for students and for me in making connections among thermodynamic principles and equilibrium.
PASCO Wireless Temperature Sensor, update on Classkick and with exams coming soon try High School Chemistry: Practice Tests and Flashcards by Varsity Tutors
Doug Ragan | Mon, 05/23/2016 - 12:31
This past week, as part of our Thermochemistry unit, my students were completing one of my favorite Target Inquiry Labs entitled “ A Very Cool Investigation”. We were using calorimeters, dissolving ammonium nitrate, and my students were recording the change in temp
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