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An After-Dinner Trick
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Abstract
A classic chemistry demonstration uses the concept of freezing point depression to lift an ice cube out of a glass of water with thread. In this Activity, students investigate the effect of adding various substances to ice water and are then challenged to use their observations to lift an ice cube from a glass with thread. The idea for the Activity comes from an item published in the Journal of Chemical Education in 1955 titled "An After-Dinner Trick", which read:You are at the supper table. Dessert is about to be served. The table is cleared except for the salt and pepper and cream and sugar, and the water glasses in which reside cubes of ice. A little diversion is wanting. Supply each guest with a short length of string, say two or three inches (or with a piece a foot long if you wish). The problem is to remove a cube of ice from the water glass, using the string. Warning: No knife, spoon, or fork is to be used, and no loop tied about the ice!
Keywords (Audience):
High School / Introductory ChemistryKeywords (Domain):
DemonstrationsKeywords (Feature):
JCE Classroom ActivityKeywords (Subject):
Aqueous Solution ChemistryTools
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- Received: August 03, 2009
ACS
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