Describes an experiment that utilizes polarimetry to measure mutarotation of glucose and nmr spectroscopy to identify the structures of reactants and products of biochemical reactions. (MLH)

Describes a laboratory teaching method in which students are given a simulated research problem to solve in groups by planning and laboratory work. (MLH)

Describes an experiment that utilizes advanced techniques for analyzing complicated nmr spectra that are not first-order. (MLH)

Describes an experiment designed to confirm that newly purchased commercial orange juice contains sufficient ascorbic acid to meet government standards, and to establish the rate of aerial oxidation of this ascorbic acid when the juice is stored in a refrigerator. (MLH)

Describes an experiment in which chemical interferences in atomic absorption analyses are examined and measured. (MLH)

Describes a student experiment in which a pendulum is swung through angles up to 160 degrees by suspending it on a solid rod. Graphical analysis is used for empirically determining parameters. (MLH)

Presents short articles on: recycling disposable plastics for laboratory use; an inexpensive source of atomic and molecular models; a simplified Boyle's Law demonstration; and a lab demonstrating energy transformation. (MLH)

Describes a scheme that uses precipitation, gas evolution, complex ion formation, and flame tests to analyze for the following ions: Hg(I), Hg(II), Sb(III), Cr(III), Pb(II), Sr(II), Cu(II), Cd(II), As(III), chloride, nitrate, and sulfate. (MLH)

Presents four short articles on: a power supply for the measurement of the charge-to-mass ratio of the electron; a modified centripetal force apparatus; a black box electronic unknown for the scientific instruments laboratory; and a simple scaling model for biological systems. (MLH)

Describes an experiment involving the oxidation of aromatic primary amines to the corresponding azo compound; suggests procedures for studying factors that influence the yield of such a reaction, including the choice of solvent and the oxidant-amine ratio. (MLH)

Discusses the feasibility of analytical experiments that use only spot plates and eye droppers, thus allowing quantitative experiments to be performed with quantitites limited to several milliliters per student. (MLH)

Describes an experiment that involves the synthesis of copper (II) aspirinate and the analysis of copper content in the product using electrogravimetric, spectrophotometric, and titrimetric methods. (MLH)

Describes a laboratory experiment dissolving zinc from galvanized nails in which data can be gathered very quickly for statistical analysis. The data have sufficient significant figures and the experiment yields a nice distribution of random errors. Freshman students can gain an appreciation of the relationships between random error, number of…

Describes a quick, inexpensive laboratory demonstration of Charles's Law. The opening of a large, round balloon is placed snugly over the mouth of a narrow-mouthed 750-mL Erlenmeyer flask, which is then heated in a strong flame. At end of the full procedure, students easily arrive at the conclusion that the volume of a gas is proportional to…

Le Chbtelier's Principle states that, when a system at equilibrium is subjected to stress, the system will respond in such a way as to minimize the effect of the stress. Describes a lecture demonstration that illustrates shifts in the position of equilibrium caused by a variety of factors. The equilibrium mixture contains iron (III) and…