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Cohen, Richard W.; Whitmer, John C. – Journal of Chemical Education, 1981
Describes how Gibbs valley graphs can clarify the relation between the Gibbs function and chemical equilibrium. Gives examples from gas phase equilibria. (CS)
Descriptors: Chemical Equilibrium, Chemical Reactions, Chemistry, College Science
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Murdoch, Joseph R. – Journal of Chemical Education, 1981
Presents information concerning a fundamental concept for understanding reaction rate, the idea of a rate-limiting step for a chemical reaction. Discusses problems in using flow analogies and introduces an alternative approach to finding the rate-limiting step based on locating the transition state of highest energy. (CS)
Descriptors: Chemical Reactions, Chemistry, College Science, Higher Education
Peer reviewed Peer reviewed
Feliu, Anthony L. – Journal of Chemical Education, 1990
Discussed are the properties, chemistry, generation of precursors, and use in organic synthesis of this isotope of carbon. The use of carbon-11 in research is emphasized. Pitfalls and possibilities are described. (CW)
Descriptors: Chemical Analysis, Chemical Reactions, Chemistry, College Science
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Logan, S. R. – Journal of Chemical Education, 1990
Discussed are the kinetic interactions of these chemical processes and the determination of the actual order of such reactions. Included are multiple exchange, catalytic exchange with deuterium, and depletion of the original substrate. (CW)
Descriptors: Chemical Analysis, Chemical Reactions, Chemistry, College Science
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MacDonald, J. J. – Journal of Chemical Education, 1990
Suggestions for the use of two different conventions in difference and rate terms in thermodynamics are made. It is shown how this approach lends itself to an accurate and concise discussion of function changes for a chemical reaction. (CW)
Descriptors: Chemical Analysis, Chemical Equilibrium, Chemical Reactions, Chemistry
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Campbell, Mark L.; Waite, Boyd A. – Journal of Chemical Education, 1990
Provided is a rebuttal to an argument concerning the use of Ka values for water and the hydronium ion. The derivation of new values as a result of the treatment of the water as the solvent and using a Raoult's Law standard state is discussed. (CW)
Descriptors: Acids, Chemical Analysis, Chemical Equilibrium, Chemical Reactions
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Fortman, John J.; Battino, Rubin – Journal of Chemical Education, 1990
Described are demonstrations provided for secondary school students designed to illustrate the fun and wonder of chemistry and learning by experimentation. A list of the contents for the videotapes and suggestions for discussions using the videotapes are provided. (CW)
Descriptors: Audiovisual Aids, Chemical Reactions, Chemistry, Demonstrations (Educational)
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Ma, Yinfa; Yeung, Edward S. – Journal of Chemical Education, 1990
Described is a simple and interesting chromatography experiment using three different fluorescence detection principles for the determination of caffeine, saccharin and sodium benzoate in beverages. Experimental procedures and an analysis and discussion of the results are included. (CW)
Descriptors: Chemical Analysis, Chemical Reactions, Chemistry, Chromatography
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Brown, Trevor M.; And Others – Journal of Chemical Education, 1990
Described is an experiment which may be carried out quickly using tungsten-filament irradiation. Materials, experimental procedures, and results are discussed. Procedures for filtration on silica gel are appended. (CW)
Descriptors: Chemical Reactions, Chemistry, College Science, Higher Education
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Mabbott, Gary A. – Journal of Chemical Education, 1990
Experiments designed to help undergraduate students gain experience operating instruments and interpreting gas chromatography and mass spectrometry data are presented. Experimental reagents, procedures, analysis, and probable results are discussed. (CW)
Descriptors: Biochemistry, Chemical Analysis, Chemical Reactions, College Science
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Hansen, David E.; Raines, Ronald T. – Journal of Chemical Education, 1990
Discussed is the fundamental role that the favorable free energy of binding of the rate-determining transition state plays in catalysis. The principle that all of the catalytic factors discussed are realized by the use of this binding energy is reviewed. (CW)
Descriptors: Atomic Structure, Biochemistry, Chemical Reactions, Chemistry
Peer reviewed Peer reviewed
Gilbert, George L., Ed. – Journal of Chemical Education, 1990
Described are demonstrations designed to reveal the important "nonsolvent" properties of water through its interaction with a toy called "Magic Sand" and other synthetic silica derivatives, especially those bonded with organic moities. The procedures for seven demonstrations along with a discussion of the effects are presented. (CW)
Descriptors: Chemical Reactions, Chemistry, College Science, Higher Education
Peer reviewed Peer reviewed
Champion, Timothy D.; Schwenz, Richard W. – Journal of Chemical Education, 1990
Background information, laboratory procedures, and a discussion of the results of an experiment designed to investigate the difference in energy gained from the aerobic and anaerobic oxidation of glucose are presented. Sample experimental and calculated data are included. (CW)
Descriptors: Calorimeters, Chemical Analysis, Chemical Reactions, Chemistry
Peer reviewed Peer reviewed
Williams, Kathryn R.; And Others – Journal of Chemical Education, 1990
Discussed are the procedures and results involved in this activity. Student results in undergraduate laboratories indicate high quality results and relative ease of the analysis. (CW)
Descriptors: Chemical Analysis, Chemical Reactions, Chemistry, College Science
Peer reviewed Peer reviewed
Fate, Gwendolyn; Lynn, David G. – Journal of Chemical Education, 1990
Presented are laboratory methods which allow the demonstration and determination of the diffusion coefficients of compounds ranging in size from water to small proteins. Included are the procedures involving the use of a spectrometer, UV cell, triterated agar, and oxygen diffusion. Results including quantification are described. (CW)
Descriptors: Chemical Reactions, Chemistry, College Science, Diffusion (Physics)
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