Simple methods to prepare liquid air are described. In addition, ways to test the properties of liquid air and other liquefied gases are explored.
Phases / Phase Transitions / Diagrams
The solution to Chemical Mystery #11, which involves the Leidenfrost Effect, is presented.
What happens if you place metal that is glowing orange-hot into some water? Watch this video and find out!
What happens if you cool a Scrub Daddy sponge in liquid nitrogen (or dry ice) and subsequently strike it with a hammer? Let's find out!
Improving Student Perception and Performance
The December 2017 issue of the Journal of Chemical Education is now available online to subscribers. Topics featured in this issue include: functional nanomaterials and chemical detection; improving student performance; peer-led instruction; simulations and computer-based learning; engaging and interactive instruction; synthesis laboratories; NMR spectroscopy and mass spectrometry; innovative physical chemistry investigations; ConfChem Conference on select 2016 BCCE presentations; from the archives: music and chemistry.
Celebrating the Value of Chemistry
The October 2017 issue of the Journal of Chemical Education is now available online to subscribers. Topics featured in this issue include: geochemistry in action; research on effective teaching and study approaches; keeping education and chemistry relevant; communication and writing; spectroscopy; chromatography; synthesis; teaching resources; mining the archive: chemistry rocks!
In Chemical Mystery #10, plastic straws are observed to “magically” change color when waved in the air. Check out the explanation and the video.
In this simple trick, colors are made to "magically" appear and disappear on a straw. This science experiment is very easy to do...if you know your chemistry!
In an effort to better understand my high school students' knowledge of what is happening during phase changes, heating curve calculations, and the ever popular can crush demo, I run them through a series of activities. First, I ask my students "What Temperature Does Water Boil At?"
1.5 days to do all the activities including lecture on heating curve calculations.
The solution to Chemical Mystery #9: Liquid Nitrogen vs. Dry Ice is presented. Why does liquid nitrogen launch the bucket so much higher than dry ice and water?