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In the Laboratory
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A Simple Calorimetric Experiment That Highlights Aspects of Global Heat Retention and Global Warming
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Joel D. Burley
Department of Chemistry, Saint Mary's College of California, Moraga, CA 94575-4527
Harold S. Johnston
Department of Chemistry, University of California and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
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October 2007
Vol. 84 No. 10
p. 1686
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| Abstract |
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In this laboratory experiment, general chemistry students measure the heating curves for three different systems: (i) 500 g of room-temperature water heated by a small desk lamp, (ii) 500 g of an ice–water mixture warmed by conduction with room-temperature surroundings, and (iii) 500 g of an ice–water mixture heated by a small desk lamp and by conduction with room-temperature surroundings. The students verify that heat is consumed in the melting of ice, with no increase in temperature until all the ice has melted. The fundamental calorimetric principles demonstrated by the lab results are then directly connected to the topic of global warming, and a more precise terminology—one that distinguishes between global heat retention and global warming—is developed to help students better assess and understand the experimental evidence associated with global warming.
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| Supplement |
Further descriptions of this experiment including quantitative, homework-style problems, the student laboratory handout, and alternative experimental configurations are available.
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| More Information |
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Citation |
Burley, Joel D.; Johnston, Harold S. J. Chem. Educ. 2007, 84, 1686.
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Keywords |
Atmospheric Chemistry; Calorimetry / Thermochemistry; Environmental Chemistry; First-Year Undergraduate / General; Hands-On Learning / Manipulatives; High School / Introductory Chemistry; Laboratory Instruction; Physical Chemistry
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History |
Created:
Last Updated: |
8/20/2007
9/7/2007
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 Caution! | | Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations. |
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