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• One-Hundred Years of pHJournal of Chemical Education

  • One-Hundred Years of pH

    Rollie J. Myers
    Journal of Chemical Education 2010 87 (1), pp 30–32

    Abstract: The idea of expressing the hydrogen-ion concentration on a log arithmetic scale was presented by S. P. L. Sørensen in 1909. The symbol that he used was the letter p and a smaller H appearing almost as a subscript. Typographical convenience led journals to ...

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• The Chemistry of Self-Heating Food Products. An Activity for Classroom EngagementJournal of Chemical Education

  • The Chemistry of Self-Heating Food Products. An Activity for Classroom Engagement

    Maria T. Oliver-Hoyo , Gabriel Pinto , Juan Antonio Llorens-Molina
    Journal of Chemical Education 2009 86 (11), p 1277

    Abstract:

    Two commercial self-heating food products have been used to apply chemical concepts such as stoichiometry, enthalpies of reactions and solutions, and heat transfer in a classroom activity. These products are the self-heating beverages sold in Europe and ...

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• Conventional Entropies and the Third Law of ThermodynamicsJournal of Chemical Education

  • Conventional Entropies and the Third Law of Thermodynamics

    Theresa Julia Zielinski , Todd M. Hamilton
    Journal of Chemical Education 2009 86 (12), p 1468

    Abstract: In this document, conventional entropies for several substances are calculated using the third law of thermodynamics and heat capacity data. Students explore the contributions of different phases to the total entropy of a substance by integrating the heat ...

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