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  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > April  >
In the Laboratory
JCE Classroom Activity
An After-Dinner Trick
JCE Editorial Staff
Journal of Chemical Education, Madison, WI 53715
Cover
April 2002
Vol. 79 No. 4
p. 480A
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!
More Information
*  Citation
 JCE Editorial Staff. J. Chem. Educ. 2002 79 480A.
*  Keywords
 Aqueous Solution Chemistry; Colligative properties; Consumer Chemistry; Introductory / High School Chemistry
*  History
 Created:
Last Updated:		 March 1, 2002
March 16, 2005
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