Six questions are listed that concern subject matter ranging from toxicity and biochemistry to insect physiology and physics. These questions may be used for study, review, or examination. Answers are also given. All of the questions relate to chemistry and may be adapted to different grade levels. (MR)

A discussion is presented of the toxicity, chemistry, and environmental presence of nitrosamines. Carcinogenicity and effects on various organs of test animals are reviewed. Also some information on the presence of use of nitrosamines in human food is given. (MR)

Experimental procedures for studying enzyme activity using a Spectronic 20 spectrophotometer are described. The experiments demonstrate the effect of pH, temperature, and inhibitors on enzyme activity and allow the determination of Km, Vmax, and Kcat. These procedures are designed for teaching large lower-level biochemistry classes. (MR)

An experimental procedure is described for studying oxygen uptake by a transition metal. This procedure is designed for use with undergraduates and may be used in organic or biochemistry laboratories. Diagrams of the apparatus are included. (MR)

An integrated physical-analytical-inorganic chemistry laboratory procedure for use with undergraduate biology majors is described. The procedure requires five to six laboratory periods and includes acid-base standardizations, potentiometric determinations, computer usage, spectrophotometric determinations of crystal-field splitting…

The experiment described here involves simultaneous monitoring of pH and NMR chemical shifts during an aqueous titration of alpha- and beta-alanine. This experiment is designed for use in an undergraduate biochemistry course. (MR)

A quick, sensitive method which is adaptable for quantitating periodate consumption in a variety of undergraduate laboratory contexts is described. A laboratory procedure is also given that may be used for measurements of reaction rates as a function of temperature. (MR)

A laboratory experiment is described which illustrates such concepts as resonance, inductive, steric, and solvation effects in a beginning organic chemistry course. This experiment is designed to encourage students to predict results and interpret their findings. (MR)

Two experiments are described and appropriate discussion is given to illustrate the use of substoichiometry and saturation analysis techniques with undergraduates. The first experiment is the determination of silver content in photographic film. The second is the estimation of a hormone concentration using saturation analysis and a commercially…

A precise method of determining absorption maxima where Gaussian functions occur is described. The method is based on a logarithmic transformation of the Gaussian equation and is suited for a mini-computer. (MR)

A rapid scanning polargraph, constructed from inexpensive parts, which can delay voltage scan for a predetermined length of time, is described. Schematic diagram of the instrument is included. Uses of the instrument are described. (MR)

An experiment in rapid scanning polargraphy using the Health Polargraph System is described. The experiment was designed to be used in an undergraduate course on instrument analysis. The theory, instruments, and results of the experiment are also discussed. (MR)

Describes a low cost potentiostat/coulometer which can maintain an eletroylsis current of up to 100 MA at cell voltages as high as 100V. (Author/SL)

Discusses, editorially, the role of formal education in developing understanding and knowledge to enable people to live successful lives. (SL)

Discusses the energy levels of 3d and 4s electrons. (SL)