Dual-Density Discrepancies: Ice Is Nice and Sugar Is Sweet

by: Thomas O'Brien

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.

Level

Elementary SchoolMiddle SchoolHigh School

Details

Type Book ChapterPub Date 3/1/2011

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