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Showing 2,686 to 2,700 of 8,904 results
Peer reviewedReglinski, John; Graham, Duncan; Kennedy, Alan R.; Gibson, Lorraine T. – Journal of Chemical Education, 2004
An exercise is organized to reinforce the fundamental rules of coordination chemistry through a biological study of metalloproteins. The work, which is divided into four well-defined activities, involves a major application of computer databases to address chemical problems.
Descriptors: Chemistry, Learning Activities, Databases, Teaching Methods
Peer reviewedMabrouk, Suzanne T. – Journal of Chemical Education, 2004
A chemical analysis of lotions, which comprises of categorizations of moisturizers and emulsions, with the preparation and testing of three lotions, is done. The experiment piques students' interest in preparing lotions and emulsions, and proves the value of chemistry in satisfying the needs of everyday life.
Descriptors: Chemistry, Science Experiments, Student Interests, Relevance (Education)
Peer reviewedMowery, Kelly A.; Blanchard, Daniel E.; Smith, Stephanie; Betts, Thomas A. – Journal of Chemical Education, 2004
An experiment to initiate students into several features of gas chromatograph-mass spectrometers (GC-MS) through the study of branded and counterfeit perfumes is described. The experiment enables the students to appreciate the power of GC-MS in distinguishing between original and imitation perfumes, and in analyzing data with its application…
Descriptors: Computer Software, Investigations, Educational Technology, Science Experiments
Peer reviewedBeckers, Jozef L. – Journal of Chemical Education, 2004
The presence of caffeine in coffee is determined by the use of separation devices and UV-vis spectrophotometry. The results indicate that the use of various analytical tools helps to perceive the higher concentration values obtained through UV-vis spectrophotometry than with separation methods.
Descriptors: Chemistry, Educational Technology, Spectroscopy, Science Experiments
Peer reviewedPalma, Miguel; Barroso, Carmelo G. – Journal of Chemical Education, 2004
Experiments are performed to establish the changes of pH during the precipitation of potassium hydrogen tartrate, with its unfavorable impact on the stability of wine. Students, thus, obtain a clearer understanding of the interplay between a variety of chemical equilibria within a single medium.
Descriptors: Chemistry, Science Experiments, Science Education
Peer reviewedSantos-Delgado, M. J.; Larrea-Tarruella, L. – Journal of Chemical Education, 2004
The back-titration methods are compared statistically to establish glycine in a nonaqueous medium of acetic acid. Important variations in the mean values of glycine are observed due to the interaction effects between the analysis of variance (ANOVA) technique and a statistical study through a computer software.
Descriptors: Computer Software, Statistical Analysis, Chemistry, Comparative Analysis
A Spectrophotometric Study of the Permanganate-Oxalate Reaction: An Analytical Laboratory Experiment
Peer reviewedKalbus, Gene E.; Lieu, Van T.; Kalbus, Lee H. – Journal of Chemical Education, 2004
The spectrophotometric method assists in the study of potassium permanganate-oxalate reaction. Basic analytical techniques and rules are implemented in the experiment, which can also include the examination of other compounds oxidized by permanganate.
Descriptors: Laboratory Experiments, Chemistry, Spectroscopy, Science Experiments
Peer reviewedFong, Lawrence K. – Journal of Chemical Education, 2004
Students in the general chemistry course are advised to scrutinize data obtained by gas chromatograph (GC) for segregation, and mass spectroscopy (MS) for recognizing combination of group 6 transition-metal carbonyl compounds. The GC-MS method arouses students' interest, as it can be applied to real-world situations, such as the routine…
Descriptors: Chemistry, Metallurgy, Science Curriculum, Spectroscopy
Peer reviewedSanz, Martial – Journal of Chemical Education, 2004
A thin-wall disposable Pasteur pipet is used as a vacuum-tight receptacle for air-sensitive compounds to ascertain their melting points. This technique is easy, economical, and successfully used for many years to develop air-sensitive samples for melting point determinations.
Descriptors: Chemistry, Laboratory Equipment, Science Experiments, Laboratory Experiments
Peer reviewedPandita, Sangeeta; Goyal, Samta; Passey, Sarita – Journal of Chemical Education, 2004
A successful microscale fusion of semicarbazones, or transformation of carbonyl compounds into semicarbazones is performed through an effective grinding system. The donning of protective attire is advised to avoid the hazardous effects of semicarbazide hydrochloride during the fusion process.
Descriptors: Chemistry, Hazardous Materials, Laboratory Procedures, Laboratory Safety
Peer reviewedFeist, Patty L. – Journal of Chemical Education, 2004
Segregation and recognition of two unfamiliar concrete organic compounds are achieved through microscale flash chromatography and spectroscopy plus melting point verifications respectively. This inexpensive and harmless microscale experiment for sophomore students ensures exercise in chromatographic and spectroscopic methods.
Descriptors: Organic Chemistry, College Students, Laboratory Experiments, Spectroscopy
Peer reviewedPelter, Michael W.; Pelter, Libbie S. W.; Colovic, Dusanka; Strug, Regina – Journal of Chemical Education, 2004
The sequence of microscale mixing of 1-bromo-3-chloro-5-iodobenzene along with reductive deamination of 4-bromo-2-chloro-6-iodoaniline is described. This novel deamination approach is beneficial in final product separation and higher product output.
Descriptors: Chemistry, Science Experiments, Evaluation Methods, Science Education
Peer reviewedBryant, Philip A.; Morgan, Matthew E. – Journal of Chemical Education, 2004
The potency of heat in gases is measured by the application of a computer and the LabWorks interaction, while the speed of sound in gases is determined by an instrument called Kundt's tube. This unique and accurate procedure is repeatable, and greatly reduces data acquisition time.
Descriptors: Heat, Thermodynamics, Educational Technology, Measurement Equipment
Peer reviewedGomes, M. Teresa S. R.; Oliveira, M. Manuela O.; Fonseca, M. Arminda; Oliveira, Joao A. B. P. – Journal of Chemical Education, 2004
Examination of the Faraday constant is conducted using a speedy electrolysis experiment. This cost-effective, easy and fast procedure makes it highly suitable for classroom applications.
Descriptors: Science Experiments, Chemistry, Laboratory Procedures, Evaluation Methods
Peer reviewedDeMeo, 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


