Discrepant Events are usually demos or quick activities which get a kid’s attention. Here are a few standards from Sciencing. Did you know an ice cube will float in water test sink in isopropyl alcohol? Here are several density activities from ACS, including the sinking ice cube. I use the Poly Density Bottle whenever I teach the topic, density, as a discrepant event. (I can’t wait to have the teens in Chem next year make their own versions.)
Ghost Crystals are another good example of a discrepant event. (Polymer water gel beads, marbles, or crystals have the same index of refraction as water.)
Another favorite is the Disappearing Beaker. (Borosilicate or Pyrex has the same index of refraction as corn oil.)
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