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

Describes a method of recording galvanometer deflections when using a d'Arsonval galvanometer to demonstrate forced, damped simple harmonic motion. (SL)

The effectiveness of an educational program in decreasing utilization of the prothrombin time determination as a routine admission laboratory test by house staff physicians at a teaching hospital was studied. The results emphasize the need to measure the long-term outcome of educational programs aimed at modifying the clinical behavior of…

Smaller amounts of materials are used in organic chemistry experiments as a means of improving air quality in the laboratory. Outlines benefits from this approach and describes two representative experiments in detail. These experiments are the Cannizzaro reaction and preparation of an aromatic nitrile. (JN)

Two demonstrations are described. The first (useful as an introduction to kinetics) shows how the rate of a reaction is fast at first and then gradually decreases to zero when one reactant has been used up. The second is a gas density demonstration using 1,1,2-trichloro-1,2,2-trifluoro ethane. (JN)

Describes three trace determinations of organic substances utilizing a spectrophotometer. Provides procedures and absorbance wavelengths for determining acetonitrile, oxalic acid, and oxalic acid in human serum. Explores the role of acetonitrile and oxalic acid as catalysts in their respective reactions. (ML)

Describes a three-week sequence to take undergraduate students through the study of enzyme kinetics in an integrated manner that reinforces the basic concepts of initial velocity and the effects of varying operational parameters. Discusses laboratory sessions and the use of a microcomputer in instruction. (CW)

Describes the chemical analysis and rating system used at "Consumer Reports" in rating antacids. Discusses considerations made concerning dosage and duration of 12 common brands of antacid. (CW)

Discusses general statistical methods which could be employed to develop homework problems and laboratory exercises. Methods emphasize experimental design and the effects of uncertainties on inferences drawn from experimental data. (CW)

Describes an apparatus that uses liquified gases to wash solids. Discusses the procedures and processes used to do a wash with liquid sulfur dioxide. (CW)

Outlines a laboratory exercise that makes use of Beer's Law plots of cysteine constructed at several pH values over a broad range of wavelengths to estimate the tautomeric ratio (R) of two singly charged ionic forms, calculate the microscopic constants, and construct ultraviolet spectra for both light absorbing species. (CW)

Discusses the effects of using carbon dioxide contaminated sodium hydroxide solution as a titrant for a solution of a weak monoprotic acid and the resulting distortion of the titration curve in comparison to one obtained when an uncontaminated titrant is used. (CW)

Reported the development and validation of an integrated model of performance on chemical concept-volumetric analysis. Model was tested on 265 chemistry students in eight schools.Results indicated that for subjects using algorithms without understanding, performance on volumetric analysis problems was not influenced by proportional reasoning…

Discusses the possibilities of toxins present in medicinal herbs. Describes an experiment in which toxic constituents can be selectively detected by thin-layer chromatography and NMR spectroscopy. (TW)

Reviews studies focusing on practical assessment in science. Areas considered include what students are really doing in laboratories, how practical skills should be assessed, methods used to assess practical science (such as internal/external examinations and continuous assessment), methodological issues, and reasons for the failure of some…