A Comprehensive General Chemistry Demonstration

• Autores: Ryan D. Sweeder, Kathleen A. Jeffery
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 90, Nº 1, 2013, págs. 96-98
• Idioma: inglés
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• Resumen

  • This article describes the use of a comprehensive demonstration suitable for a high school or first-year undergraduate introductory chemistry class. The demonstration involves placing a burning candle in a container adjacent to a beaker containing a basic solution with indicator. After adding a lid, the candle will extinguish and the produced carbon dioxide will react with the water to yield enough carbonic acid to neutralize the basic solution resulting in a change to the indicator. This demonstration includes aspects of most of the topics discussed in a typical general chemistry course. Two different methods are described to use this demonstration in a class: as a recurrent demonstration revisited regularly or as the basis for a cumulative oral final exam.