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 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)

Attempts to identify successful teaching methods and to study teacher-pupil interactions using classroom based research techniques, are discussed in this article. Conclusions are that further studies need to be done to investigate the role of the teacher and the relationships between teacher intention, action, and the teaching topic. (Author/MA)

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)

Compares average displacements of charged particles under thermal motion alone with those obtained by the action of an external electric field to develop a concept of "apparent charge" to approximate actual structural charge in an electrolyte solution. (SL)

Described are some of the physical and physiological scientific principles related to diving. The article is written as supplementary information for a teacher and includes suggested activities, a keyed test, and a bibliography. This article complements one on Sea Lab II in the same issue. (MA)

Discusses the determination of eutectic composition, the mathematics of chemical equilibrium, the wave functions of one-electron orbitals, and the use of pharmacological agents in introductory chemistry courses. (SL)

Describes an undergraduate analytical laboratory experiment demonstrating the use of masking to obtain selectivity in complexometry. (SL)

Discusses hazards involved in the storage of flammable liquids, particularly those requiring refrigeration. (SL)

Discusses the introduction of element evolution and isotopic composition as topics for introductory chemistry courses. (SL)

Describes an experimental procedure for illustrating general principles of photochemical reaction kinetics. (SL)

Reviews classroom teaching ideas including burning sugar cube experiments, science library reference materials, and growing salt crystals. (SL)

Presents a quantum mechanical model of the ionic solid, lithium hydride. (SL)

Reviews the SDS-polyacrylamide gel electrophoresis technique for the separation of proteins and determination of their molecular weights. (SL)

Presents a laboratory project in which students analyze quantitatively organic and inorganic industrial waste. (SL)