Book ChapterDigital resources are stored online in your NSTA Library.
Seemingly identical crystalline cubes (ice versus halite crystals) are observed to
either sink or float in two seemingly identical clear, colorless liquids (ethanol
and water). Also, a handful of sugar cubes are observed to sink in a container of
hot water; most dissolve, but several unexpectedly float to the top. Science discrepant events, magic tricks, and a little visual subterfuge
can be used to challenge students’ abilities to make careful empirical observations, logical arguments, and skeptical review (i.e., predict-observe-explain) while simultaneously probing their conceptual
understanding of FUNdaMENTAL concepts such as density.