Endothermic Chemical and Physical Changes: An Introductory Chemistry Experiment
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[1] Ohio State University at Marion
Ohio State University at Marion
Township of Marion, Estados Unidos
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- Localización: Journal of chemical education, ISSN 0021-9584, Vol. 83, Nº 8, 2006, pág. 1185
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
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.
