Endothermic Chemical and Physical Changes: An Introductory Chemistry Experiment

Margaret J. Steffel
The Ohio State University at Marion, Marion, OH 43302
J. Chem. Educ., 2006, 83 (8), p 1185
DOI: 10.1021/ed083p1185
Publication Date (Web): August 1, 2006
History, Education, and Documentation

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.

Keywords (Audience):

High School / Introductory Chemistry

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Descriptive Chemistry
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  • Received: August 03, 2009

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