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  Home > JCE Print > Journal of Chemical Education > Issues > 2006  > August  >
In the Laboratory
Endothermic Chemical and Physical Changes: An Introductory Chemistry Experiment
Margaret J. Steffel
The Ohio State University at Marion, Marion, OH 43302
Cover
August 2006
Vol. 83 No. 8
p. 1185
Abstract
Each of eleven unidentified compounds is heated in a test tube to determine whether the endothermic change each undergoes is a chemical change or a physical change. A chemical change is identified on the basis of a change in visible properties (physical state and color) of any material that remains after heating. A physical change is identified on the basis of appearance during heating (formation of liquid or gas) and a return to the original physical state and color on cooling, either in the bottom of the test tube or as a condensate or deposit on the cooler upper portion of the tube.
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Instructions for the students and notes for the instructor are available.
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*  Citation
 Steffel, Margaret J. J. Chem. Educ. 2006 83 1185.
*  Keywords
 Descriptive Chemistry; First-Year Undergraduate / General; Hands-On Learning / Manipulatives; High School / Introductory Chemistry; Laboratory Instruction; Phases / Phase Transitions / Diagrams; Physical Properties; Reactions
*  History
 Created:
Last Updated:		 6/21/2006
6/30/2006
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