phase changes

This activity is intended for Chemistry Teachers who plan to discuss the energetics of phase changes.

About a decade ago, I wrote briefly about the interesting experiment of throwing boiling hot water into air that is below -18°C (0°F) (see Ice Clouds).

The use of online simulations to augment classroom instruction is a common occurrence for many students. Veteran educators may remember students passively watching chemistry animations from a VHS tape, laserdisc or compact disc on a classroom TV.

This piece explains an activity that allows for the simple and accurate determination of the heat of vaporization, ΔH_vap,

Various items (hot dogs, bananas, flowers, racquetballs, plastic cups) show properties akin to glass when chilled in liquid nitrogen.^1-4 Objects such as racquetballs and plastics behave in this manner because they are made of polymers, and polymers can become cooled below what is known as the glass transition temperature (T_g) for t

Co-Authored by Dean J. Campbell* and Kaitlyn Walls* *Bradley University, Peoria, Illinois

The inaugural ChemEd X Journal Club Meeting was held virtually on April 7, 2022 to discuss the article, "Curricular Materials on the Chemistry of Pottery, Including Thermodynamic Calculations for Redox Reactions in the 3-Stage Firing Process of Athenian Black- and Red-Figure Vases Produced from the Sixth-Fourth Centuries BCE" (Journal of Chemical

Co-Authored by Dean J. Campbell*, Kayla Lippincott*, Audrey Stoewer*, Trevor Tran* *Bradley University, Peoria, Illinois

This article is the follow-up to the Icy Brinicle of Death: A COOL Example of Freezing Point Depression. Specifically, this short post provides a sample calculation to determine the molality, m, of an icy brinicle, or "icy

I was mesmerized the first time I saw the quantum levitation (also known as quantum locking) experiment, in which a disk containing a superconductor hovers above some magnets. The superconductor can even glide freely over a track of magnets – even upside down (VIDEO 1).