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Showing 121 to 135 of 197 results Save | Export
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Hoppe, Jack I.; Malati, Mounir A. – Journal of Chemical Education, 2005
An experimental study of ceramic superconductors namely YBa2Cu3O(sub 7-x), which illustrates the use of spectrophotometry, based on the electronic spectra of complexes of Fe(II), Fe(III) and Cu(II) to better understand the stoichiometry of YBCO is described. The results from this experiment are in good agreement with those obtained by the…
Descriptors: Stoichiometry, Electronics, Spectroscopy, Science Experiments
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Meek, Terry L.; Garner, Leah D. – Journal of Chemical Education, 2005
The usefulness of the bond triangle for categorizing compounds of the main-group elements may be extended by the use of weighted average electronegativities to allow distinction between compounds of the same elements with different stoichiometries. In such cases a higher valency for the central atom leads to greater covalent character and the…
Descriptors: Science Education, Chemistry, Stoichiometry, Scientific Research
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Fishtik, Ilie; Berka, Ladislav H. – Journal of Chemical Education, 2005
A simple algorithm for a complete enumeration of the possible ways a redox reaction (RR) might be uniquely decomposed into half-reactions (HRs) using the response reactions (RERs) formalism is presented. A complete enumeration of the possible ways a RR may be decomposed into HRs is equivalent to a complete enumeration of stoichiometrically…
Descriptors: Chemistry, Science Experiments, Science Instruction, Molecular Structure
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Mills, Nancy S.; Spence, John D.; Bushey, Michelle M. – Journal of Chemical Education, 2005
A series of substituted benzoic acids (SBAs) are prepared by students. The pKa shift, a result of the electron-withdrawing or electron-donating characteristics of the subsistent is examined in reference to the electrophoretic migration behavior of benzoic acid.
Descriptors: Chemistry, Science Education, Science Experiments, Stoichiometry
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Schmitz, Guy – Journal of Chemical Education, 2005
The definition of reaction rate is derived and demonstrations are made for the care to be taken while using the term. Reaction rate can be in terms of a reaction property, the extent of reaction and thus it is possible to give a definition applicable in open and closed systems.
Descriptors: Chemistry, Science Education, Science Experiments, Stoichiometry
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DeMeo, Stephen – Journal of Chemical Education, 2004
The existence of different stoichiometries in two basic zinc carbonates helps to explain their decomposition potential, and to select between the two compound formulas, which better describes zinc carbonate. The accuracy of the experiment makes it a viable means for students to perform various quantitative measurements.
Descriptors: Chemistry, Stoichiometry, Science Experiments, Science Education
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Bullard, Lisa G.; Felder, Richard M. – Chemical Engineering Education, 2007
This two-part series describes the structure of the stoichiometry course at North Carolina State University. The course had a variety of learning objectives, and several nontraditional pedagogies were used in the course delivery. The first paper outlined the course structure and policies, the preparation given to the teaching assistants who played…
Descriptors: Course Content, Course Organization, Stoichiometry, Educational Objectives
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Patterson, James; Sigurdsson, Snorri Th. – Journal of Chemical Education, 2005
The reduction of ethyl acetoacetate using common baker's yeast is a traditional experiment that shows the stereoselective power of a biochemical system. Addition of organic solvents to aqueous reaction system increased the yields and reproducibility of the experiment thus overcoming the two problems associated with the experiment, low yield, and…
Descriptors: Food, Biochemistry, Organic Chemistry, Science Education
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White, Lori L.; Kittredge, Kevin W. – Journal of Chemical Education, 2005
The reduction of carbonyl groups by sodium borohydride though is a well-known reaction in most organic lab texts, a difficulty for an instructor adopting this reaction in a student lab is that it is too long. Using a microwave assisted organic synthesis solves this difficulty and one such reaction, which is the microwave-assisted reduction of…
Descriptors: Laboratory Experiments, Science Experiments, Organic Chemistry, Stoichiometry
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Nicholas, Christopher J.; Taylor, Melissa R. – Journal of Chemical Education, 2005
Sharpless asymmetric dihydroxylation is developed that focuses on the varying enantiomeric excess of the product diols based on the structures of the alkenes being oxidized. The experimental sequence enables investigation of this reaction in terms of the different chiral ligands being used.
Descriptors: Organic Chemistry, Molecular Structure, Science Education, Science Experiments
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Daley, Joshua M.; Landolt, Robert G. – Journal of Chemical Education, 2005
The addition of a dilute solution of bromine in carbon tetrachloride to a compound to test for carbon-carbon multiple bonds, which is one of the widely cited qualitative tests employed in organic chemistry is presented. Major advantages of this approach include the ease and rapidness of the procedure, the stability of the test solution over time,…
Descriptors: Organic Chemistry, Science Experiments, Science Education, Stoichiometry
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Tykodi, R. J. – Journal of Chemical Education, 1987
Presented are three methods for dealing with chemical problems involving reaction stoichiometry. (RH)
Descriptors: Chemical Reactions, Chemistry, College Science, Problem Solving
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Lacy, Jeffrey E. – Journal of Chemical Education, 2005
The presentations that will enable students to perform a side-by-side comparison of two conditions and gain better understanding of reactions at equilibrium are illustrated. A novel stoichiometric criterion for identifying equilibria that shift left upon addition of reactant is derived.
Descriptors: Chemistry, Science Education, Science Instruction, Science Experiments
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Romero, Alicia; Hernandez, Willie; Suarez, Marco F. – Journal of Chemical Education, 2005
The effect of some parameters on sulfurous acid and sulfur oxidation kinetics such as initial concentration of sulfurous acid, oxygen, TiO[2] crystalline concentration, the power of black light, and quantity of TiO[2] is investigated. The experiments can be performed in an undergraduate physical chemistry laboratory with an inexpensive…
Descriptors: Chemistry, Science Experiments, College Science, Stoichiometry
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Baar, Marsha R.; Russell, Charles E.; Wusthoiz, Kristen L. – Journal of Chemical Education, 2005
An experiment to demonstrate the use of ethylene ketal as a protecting group, one that can be completed in four lab periods, is described. The hydroxy ketone like 4-hydroxy-4, 4-diphenyl-2-butanone formed during the reaction can be identified by its melting point, IR, and (super 1)H NMR.
Descriptors: Science Education, Science Experiments, Science Laboratories, Laboratory Experiments
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