Background information, procedures, and results of an experiment suitable for measuring subpart per million concentrations of anionic surfactants in natural waters and waste effluents are provided. The experiment required only a spectrophotometer or filter photometer and has been successfully performed by students in an undergraduate environmental…

Points out that excellent results are obtained using an air-natural gas flame in atomic absorption experiments rather than using an air-acetylene flame. Good results are obtained for alkali metals, copper, cadmium, and zinc but not for the alkaline earths since they form refractory oxides. (Author/JN)

Reactions of phenolphthalein with sodium hydroxide and sulfuric are discussed. Also discusses the sulfonation of phenolphthalein, listing experimental results related to the sulfonation reaction. (JN)

Provides background information, procedures, and results of an undergraduate physical chemistry experiment on the polarization of absorption spectra of cyanine dyes in stretched polyvinyl alcohol films. The experiment gives a simple demonstration of the concept of linear dichromism and the validity of the TEM method used in the analyses. (JN)

Discusses the acylation version of malonic synthesis of three-ketoesters. Includes advantages of this method over other methodologies including a final selective removal of the "activating" ester function in such mild conditions that most of the organic functions may survive. (JN)

Three experiments demonstrating the feasibility of encapsulating liquids within a starch matrix are described, including encapsulation of linseed oil using the zanthate method and of turpentine and butylate using the calcium adduct procedure. Encapsulated materials, including pesticides, are slowly released from the resulting matrix. Considers…

Describes an experiment which gives students experience with uncertainties encountered in studying metabolic pathways; handling/use of radioisotopes; application of thin layer chromatography; and liquid scintillation counting and fluorography as methods of detecting radioactivity. The experiment can be accomplished in two to three laboratory…

Provides list of tests available for the 1983 American Chemical Society (ACE) testing program and tables of condensed norms for six ACE examinations. Also provides a listing of the subject matter content of General Chemistry Form 1983 and 1983B. The test contains 80 items in 15 major areas. (JN)

Provides information regarding spill control systems in chemical and biological laboratories. Various methods currently in use are described. Suggestions are made for the use of absorbents. (CS)

Considers carbon-carbon multiple bonds in terms of Pauling's bent bond model, which allows direct calculation of double and triple bonds from the length of a CC single bond. Lengths of these multiple bonds are estimated from direct measurements on "bent-bond" models constructed of plastic tubing and standard kits. (CS)

Reviews stereochemistry and reaction mechanisms of organosilicon compounds, their reactive intermediates, examples of bioactive organosilanes and those used in organic synthesis. Sources of commercial organosilicon compounds are listed. (CS)

Presents a survey of the literature and a summary of information regarding aphrodisiacs. Chemical compounds are discussed as groups of plant natural products, animal natural products, and synthetic products. (CS)

Designed for the organic chemist involved in interpreting NMR spectra, basic concepts of chemical shift equivalence and magnetic equivalence in NMR spectrometry are discussed. (CS)

Discusses and compares the use of the word "reversibility" as it applies to thermodynamics, to equilibrium studies, and to kinetics. Discusses misuse of the word "irreversible" and its elimination from descriptions of chemical reactions. (CS)

Presents a method for estimating the energy difference between two tautomers of an alpha-amino acid. (CS)