This experiment develops the students' ability to carry out a simple recrystallization effectively, and demonstrates how a solvent may be selected or rejected for the recrystallization of a specific organic compound. (Author/BB)

The setup described here for recording chemical transient phenomena is intended to be simple and an instructive example of interfacing experiments that can be performed on any microcomputer possessing adequate memory and input-output facilities. (BB)

Provides five secondary level investigations designed to examine allelopathy, the inhibition of plant growth by chemicals produced by another plant. (MA)

A practical exercise is described that allows students to investigate a specific problem using a variety of biochemical techniques. The need for a thorough understanding of the theoretical principles underlying these processes is emphasized. A program of private study and assessment is suggested to enable the progress of students to be followed.…

A new scale is suggested, with the objective of simplifying relationships between the various scales and units used in spectroscopy. Although there are certain drawbacks to such a scale, it is hoped that the suggestion will stimulate discussion on the relevance of the many scales and units that are used. (Author/BB)

Describes a laboratory experiment demonstrating the aldehyde oxidase activity in wild type and mutant fruit flies using a quantitative assay. The experiment can be performed in one hour. (MA)

Surveys new laser techniques and a variety of spectroscopic experiments that can be used to detect, measure and study very small numbers of atoms on molecules. The range of applicability of these techniques is also included. (HM)

Describes several experimental results selected from typical inorganic and organic reaction systems, along with a brief description of the physical parameters needed to determine if a pressure increase will help solve a synthetic problem. (HM)

Describes a college student chemistry laboratory experiment that illustrates the construction of a polarimeter from inexpensive, readily-available materials. (HM)

Discusses the adaptation of some familiar equipment for use in physics demonstrations: demonstrating waves using a folding slinky, measuring the partial pressure of water vapor, lengthening the time constant on a rate meter, measuring "g" with a phonograph turntable, and constructing a cheap signal generator. (GA)

This reaction is used in an introductory organic chemistry course to illustrate principles of gas-liquid chromatography, geometrical isomerism, homogeneous catalysis, and activation energy determinations. (BB)

Provides eight physics experiments, demonstrations, and activities relating to radioactive decay, computers, semiconductors, and electronics. (SL)

Describes a computer simulation to elucidate the subject of coherence. The model on which simulation is based links coherence to the correlation of fields. It also describes the model and presents some results. (Author/GA)

Ethylene hydrogenation on a platinum catalyst, electrolytically applied to a tube wall, is a good system for the study of the interactions between diffusion and surface reaction in heterogeneous catalysis. Theoretical background, apparatus, procedure, and student performance of this experiment are discussed. (BB)

Presents an experiment involving the identification of FD&C dyes by visible spectroscopy. (SL)