In this Activity, students test two chemical deicers, rock salt (sodium chloride) and calcium chloride, to determine which melts ice better and whether it is worth the extra cost to buy a more expensive deicer. They perform three tests comparing the two deicers, predict which will be more effective at melting through a thin disk of ice, and then test their prediction. An extension to this Activity is to integrate it into a discussion about ecology. Although sodium chloride and calcium chloride are the most common deicers, they are not the most environmentally friendly.
Lyga, J. W.; 2002, 79, 592A.