Gives an explanation to the process of charging the conventional leaf electroscope, by induction, using a charged insulated rod. (GA)

The design and use of an instrument simulator is described. Used for student laboratory experiments illustrating the use of mini-computers, it can provide, at very low cost, a repetitive, repeatable output to duplicate the readout of various instruments such as electrochemical experiments, mass spectrometers, pulsed magnetic experiments,…

The bonding of dioxygen in metal-dioxygen complexes is discussed, paying particular attention to the problems encountered in assigning conventional oxidation numbers to both the metal center and coordinated dioxygen. Complexes of iron, cobalt, chromium, and manganese are considered. (BB)

A new, small magnetic susceptibility system is described which can be constructed from commercially available components for less than one hundred dollars for use with a standard laboratory balance. (BB)

A lecture demonstration is presented for comparing titration curves. A plot of pH vs volume of strong base is produced by connecting the external output of a pH meter to a strip recorder. Thus, pH is recorded as a function of time. (BB)

In this experiment, students prepare, isolate, and characterize two geometrical isomers of a metal coordination compound. This experiment provides a good introduction to the techniques of modern coordination chemistry. (BB)

This paper describes an attempt to evaluate the contribution of laboratory experiments on student achievement in an elementary, one-term college chemistry course and suggests some less expensive alternatives. (Author/BB)

Described is an experiment that allows students to determine the distance to the moon by triangulation. Included is a description of parallax methods and photographic techniques. (CS)

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)

Lists materials and procedures for experimenting with detergents. Included are methods for determination of the densities of dry detergents, ph values of detergent solutions, and a discussion of the ability of detergents to remove iodine stains from cloth. (CS)

Presented are accounts of how two local jurisdictions in the United States have dealt with the question of regulating recombinant DNA research. Arguments used to devise guidelines for consideration by the New York State Legislature and the recommendations made by a citizens group in Cambridge, Massachusetts are detailed. (CS)

Reproduced is the report made by a citizens' group in Cambridge, Massachusetts and presented to the city council that outlines safety regulations for the conduct of recombinant DNA research at Harvard University and the Massachusetts Institute of Technology. (CS)

Describes a laboratory project for first-year biology students that examines competition among various cellular slime molds. After a brief introduction to the topic of competition and basic life history information about cellular slime molds, students choose a question and design original experiments to seek an answer. (Author/AIM)

Describes an approach for making chemistry relevant to everyday life. Involves the study of kinetics using the decomposition of hydrogen peroxide by vegetable juices. Allows students to design and carry out experiments and then draw conclusions from their results. (JRH)

Presents experiments with polarized light for grades 8-12 which can produce colorful effects with a minimum of equipment and can illustrate many principles of physics, chemistry, and geology. (MKR)