Highlights procedures and results of an experiment using atomic absorption spectroscope to illustrate a fundamental chemical concept. The experiment demonstrates the dependence of the solubility product of lead sulfate on ionic strength in the presence of a slight excess of anion. (Author/JN)

The monochromaticity, directionality, and intensity of laser light make possible spectroscopic investigations of previously unimagined precision. Several of these investigations and their applications are discussed. (Author/JN)

Experimental procedures and typical student data/results are provided for an experiment determining the sodium (parts per million) in salt substitute with an error of a few percent. Problems encountered with the technique are addressed. (Author/JN)

Described is a conductiometric method for following the course of diffusion of aquated ions through a cellulose membrane. Several experiments using the method are described. (Author/SA)

Polarization of laser light is discussed and the theoretical and experimental aspects of fluxes are considered. (Author/SK)

Laboratory procedures, calculations, and sample results are described for a freshman chemistry experiment in which the Clausius-Clapeyron equation is introduced as a means of describing the variation of vapor pressure with temperature and for determining enthalpy of vaporization. (Author/SK)

Proposes a format for submitting 50-minute experiments suitable for high school beginning chemistry classes to this journal for a new feature section. (CS)

Presents a physical inorganic experiment in which large single crystals of the alkali halides doped with divalent ion impurities are prepared easily. Demonstrates the ion pairing of inorganic ions in solid solution. (CS)

Describes an experiment for general chemistry that illustrates the use of spectroscopy in the synthesis, characterization, and nitration of tris(acetylacetonato)cobalt (III). (CS)

Describes refinements and modifications in the construction of an apparatus to study the kinetics of fast reactions. (CS)

Deals with the conversion of electronic hand calculators to timing devices. This article illustrates a conversion of a rather versatile calculator by means of simple and inexpensive circuitry. (HM)

The chemical system of rubbery elasticity is presented. Several references are given from which to extract experiments and problems for students. (SA)

Detailed descriptions are given of two procedures for measuring the radius of the earth, one using a rule and the other a stopwatch. (MP)

Discusses new experiments that are being designed to solve the solar neutrino problem and determine the power source of the sun. (HM)

Lists materials and methods for an experiment that demonstrates the concept of glomerular filtration rate (GFR) using anesthesized dogs. In the dog, GFR is equivalent to the renal plasma clearance of exogenous creatinine. (CS)