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Bellamy, Michael K. – Journal of Chemical Education, 2010
The internal standard method is widely applied in quantitative analyses. However, most analytical chemistry textbooks either omit this topic or only provide examples of a single-point internal standardization. An experiment designed to teach students how to prepare an internal standard calibration curve is described. The experiment is a modified…
Descriptors: Spectroscopy, Chemistry, Teaching Methods, Science Instruction
Faraldos, Juan A.; Giner, Jos-Luis; Smith, David H.; Wilson, Mark; Ronhovde, Kyla; Wilson, Erin; Clevette, David; Holmes, Andrea E.; Rouhier, Kerry – Journal of Chemical Education, 2011
This organic laboratory experiment introduces students to stereoselective enzyme reactions, resolution of enantiomers, and NMR analysis of diastereomers. The reaction between racemic 1-phenylethanol and vinyl acetate in hexane to form an ester is catalyzed by acylase I. The unreacted alcohol is then treated with a chiral acid and the resulting…
Descriptors: Biochemistry, Laboratory Experiments, Science Instruction, Scientific Principles
Peer reviewed
Allpress, K. N.; And Others – Journal of Chemical Education, 1981
Presents an experiment used in laboratory technician training courses to illustrate the quantitative use of infrared spectroscopy which is based on industrial and laboratory procedures for the determination of vinyl acetate levels in ethylene vinyl acetate packaging films. Includes three approaches to allow for varying path lengths (film…
Descriptors: Chemical Analysis, Chemistry, College Science, Higher Education
St. Laurent, Gilles – 1991
This report begins by defining sound recordings as machine readable artifacts, i.e., documents for which the integrity of the information they contain is directly related to the artifacts' physical condition. It then explains the equipment and media used in the recording, retention, and playback of sound, including the microphone, the speaker,…
Descriptors: Audiodisks, Audiotape Cassettes, Audiotape Recordings, Electronic Equipment