Describes a three-hour liquid chromatography experiment involving rapid separation of colored compounds in glass columns packed with a nonpolar absorbent. Includes apparatus design, sample preparation, experimental procedures, and advantages for this determination. (SK)

This article presents a discussion of the HMI's National Secondary Survey in England during 1975-1978, emphasizing the status of science in the last two years of compulsory education. (SA)

Presented is an expression of opinion on the use of the discovery method in secondary school chemistry classes. The author believes that general rules (lemmas) should be given to students and then they should attempt to disprove the lemmas by observation of experiments. (Author/SA)

Provides a gas chromatography experiment that exercises the quantitative technique of standard addition to the analysis for a minor component, methyl salicylate, in a commercial product, "wintergreen rubbing alcohol." (CS)

Presents a description of the National Center for Atmospheric Research, a center where scientists pursue research interests, where research facilities, too large and expensive for any one institution to maintain, are housed, and where unified planning for research is made in response to national and international concerns. (SA)

Discusses modernizing, remodeling, or developing new home economic facilities. Equipment considerations, curriculum objectives, the making of a master plan, and planning reminders are provided along with a basic sketch to review prior to planning home economics laboratories. (Author)

Describes a 3.33-cm wavelength (9 GHz) microwave system that achieves a high overall signal sensitivity and a well-collimated beam with moderate-size equipment. The system has been used to develop microwave versions of the Michelson interferometer, Bragg reflector, Brewster's law and total internal reflection, and Young's interference experiment.…

Outlines and discusses procedures for the preparation of lucigenin, a powerfully chemiluminescent compound. Major techniques (requiring three 4-hour sessions) involving nucleophilic and electrophilic aromatic substitution, nucleophilic aliphatic substitution, reductive coupling, and oxidation reactions include steam distillation, decolorization…

A simple polarographic method is used to obtain continuous oxygen dissociation curves under a variety of conditions using a Clark oxygen electrode system. (Author/SK)

Provides background information on and experimental procedures for the preparation of sulcatol, an insect chemical. Includes physical properties of sulcatol derivatives and time required to complete experiments in the undergraduate organic chemistry laboratory. (Author/SK)

Provided are directions for culturing bacteria by using yoghurt as a culture medium. Yoghurt is a safe medium and results in an end product which may be eaten if desired. (PB)

The acid-catalyzed hydrolysis of N-vinyl pyrrolidone provides a simple spectrophotometric kinetic experiment to introduce general acid catalysis, solvent isotope effects, and other aspects of ionic reactions in solution in advanced courses. The Bronsted equation and concept of linear free-energy changes is also covered. (SK)

Describes a simple demonstration that shows the change in molecular density and the reduction in pressure of air in a centrifugal field. Uses two circular disks with the same radius and rotating with the same angular velocity, in loose mutual contact, around their symmetry axis. (GA)

A classroom photography activity is outlined that motivates learning of mathematical topics such as estimation, geometry, ratio, measurement, and algorithms. (MP)

Describes the structure of a laboratory that integrates material introduced in the various disciplines including microbiology, pathology, and histology. (MA)