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Showing 1 to 15 of 723 results Save | Export
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Lindmark, Alan F. – Journal of Chemical Education, 2010
Teaching the VSEPR (valence shell electron-pair repulsion) model can be a tedious process. Traditionally, Lewis structures are drawn and the number of "electron clouds" (groups) around the central atom are counted and related to the standard VSEPR table of possible geometries. A simpler method to deduce the VSEPR structure without first drawing…
Descriptors: Majors (Students), Inorganic Chemistry, Lecture Method, Science Education
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Murphy, Thomas J. – Journal of Chemical Education, 2009
There are significant contradictions in undergraduate organic chemistry textbooks as to the mechanism of nucleophilic substitution reactions at saturated secondary carbons. Some texts say that only the S[subscript N]2 mechanism operates, others say that solvolysis reactions go entirely by the S[subscript N]1 mechanism, while most texts say that…
Descriptors: Organic Chemistry, Textbooks, Chemistry, Kinetics
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Sierra, Manuel Gonzalez; Pellegrinet, Silvina C.; Colombo, Maria I.; Ruveda, Edmundo A. – Journal of Chemical Education, 2008
An exercise on structure elucidation for advanced undergraduate students is described. To determine the structure of an unknown product, students are required to use spectra together with an organic chemistry mechanism. This exercise exemplifies the procedure commonly used in research, thus helping students develop problem-solving skills. In…
Descriptors: Undergraduate Students, Organic Chemistry, Higher Education, Problem Solving
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Shaver, Lee Alan – Journal of Chemical Education, 2008
The determination of phosphates by the classic quimociac gravimetric technique was used successfully as a laboratory experiment in our undergraduate analytical chemistry course. Phosphate-containing compounds are dissolved in acid and converted to soluble orthophosphate ion (PO[subscript 4][superscript 3-]). The soluble phosphate is easily…
Descriptors: Chemistry, Laboratory Experiments, Undergraduate Students, Higher Education
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Sun, Luyi; O'Reilly, Jonathan Y.; Tien, Chi-Wei; Sue, Hung-Jue – Journal of Chemical Education, 2008
A simple and effective approach to prepare conductive polystyrene/carbon nanofiber (PS/CNF) nanocomposite films via a solution dispersion method is presented. Inexpensive CNF, which has a structure similar to multi-walled carbon nanotubes, is chosen as a nanofiller in this experiment to achieve conductivity in PS films. A good dispersion is…
Descriptors: Chemistry, Laboratory Experiments, Science Curriculum, Higher Education
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Gerber, Ralph W.; Oliver-Hoyo, Maria T. – Journal of Chemical Education, 2008
This experiment is designed to expose undergraduate students to the process of selective etching by using soft lithography and the resulting electrical properties of multilayered films fabricated via self-assembly of gold nanoparticles. Students fabricate a conductive film of gold on glass, apply a patterned resist using a polydimethylsiloxane…
Descriptors: Undergraduate Students, Science Instruction, Experiments, Higher Education
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Ito, Takashi; Perera, D. M. Neluni T.; Nagasaka, Shinobu – Journal of Chemical Education, 2008
This article describes an undergraduate electrochemistry laboratory experiment in which the students measure the L-ascorbic acid content of a real sample. Gold electrodes modified with self-assembled monolayers (SAMs) of thioctic acid and cysteamine are prepared to study the effects of surface modification on the electrode reaction of L-ascorbic…
Descriptors: Chemistry, Laboratory Experiments, Higher Education, Undergraduate Students
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Bauer, Jurica; Tomisic, Vladislav; Vrkljan, Petar B. A. – Journal of Chemical Education, 2008
A simple method for studying the kinetics of a chemical reaction is described and the significance of reaction orders in deducing reaction mechanisms is demonstrated. In this student laboratory experiment, oxidation of iodide by iron(III) ions in an acidic medium is transformed into a clock reaction. By means of the initial rates method, it is…
Descriptors: Kinetics, Chemistry, Laboratory Experiments, Regression (Statistics)
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Sidhwani, Indu Tucker; Chowdhury, Sushmita – Journal of Chemical Education, 2008
Qualitative analysis of inorganic salts and mixtures is an essential experiment carried out in high school, undergraduate, and postgraduate levels all over the world especially in India and South Asia. The classical technique uses H[subscript 2]S, which is highly toxic and has adverse effects on humans and the environment. Increasing awareness…
Descriptors: Chemistry, Foreign Countries, Higher Education, Undergraduate Students
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Beckett, Ronald; Sharma, Reshmi; Andric, Goja; Chantiwas, Rattikan; Jakmunee, Jaroon; Grudpan, Kate – Journal of Chemical Education, 2007
Particle separation is an important but often neglected topic in undergraduate curricula. This article discusses how the method of gravitational field-flow fractionation (GrFFF) can be used to illustrate many principles of separation science and some fundamental concepts of physical chemistry. GrFFF separates particles during their elution through…
Descriptors: Chemistry, Laboratory Experiments, Undergraduate Study, Higher Education
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Tavares, Susana C. A.; da Silva, Joaquim C. G. Esteves; Paiva, Joao – Journal of Chemical Education, 2007
Aiming at a better understanding of the problems associated with the depletion of the ozone layer, we propose several experiments to be performed by students of different levels: secondary and first-year undergraduate students. The oxidation of iodide induced by ultraviolet (UV) radiation, generated by a mercury lamp, is used as an indicator for…
Descriptors: Undergraduate Students, Chemistry, Radiation, Laboratory Experiments
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Green, Brian; Bentley, Michael D.; Chung, Bong Y.; Lynch, Nicholas G.; Jensen, Bruce L. – Journal of Chemical Education, 2007
The triterpenes are a diverse class of widely distributed natural products derived from squalene. Various cyclization and subsequent rearrangement reactions produce many complex structural types. These compounds frequently display a wide divergence of biological properties. For example the pentacyclic triterpene, betulin, is isolated from white…
Descriptors: Organic Chemistry, Chemistry, Laboratory Experiments, Higher Education
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Qvit, Nir; Barda, Yaniv; Gilon, Chaim; Shalev, Deborah E. – Journal of Chemical Education, 2007
This laboratory experiment provides a unique opportunity for students to synthesize three analogues of aspartame, a commonly used artificial sweetener. The students are introduced to the powerful and useful method of parallel synthesis while synthesizing three dipeptides in parallel using solid-phase peptide synthesis (SPPS) and simultaneous…
Descriptors: Chemistry, Laboratory Experiments, Teaching Methods, Spectroscopy
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Greco, George E. – Journal of Chemical Education, 2007
An experiment for the upper-level undergraduate laboratory is described in which students synthesize a ruthenium olefin metathesis catalyst, then use the catalyst to carry out the ring-closing metathesis of diethyl diallylmalonate. The olefin metathesis reaction was the subject of the 2005 Nobel Prize in chemistry. The catalyst chosen for this…
Descriptors: Chemistry, Laboratories, Experiments, Undergraduate Students
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Pappenfus, Ted M.; Hermanson, David L.; Ekerholm, Daniel P.; Lilliquist, Stacie L.; Mekoli, Megan L. – Journal of Chemical Education, 2007
A series of experiments for undergraduate laboratory courses (e.g., inorganic, organometallic or advanced organic) have been developed. These experiments focus on understanding the design and catalytic activity of ruthenium-indenylidene complexes for olefin metathesis. Included in the experiments are the syntheses of two ruthenium-indenylidene…
Descriptors: Chemistry, Laboratory Experiments, Undergraduate Study, Higher Education
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