Reports a procedure for the formation of alkyldiazenido complexes of molybdenum in the absence of dioxygen, suitable for inclusion in an advanced inorganic chemistry laboratory. Includes background information and experimental procedures for two complexes. (SK)

Suggests that students study heats of neutralization of a 1 M solution of an unknown acid by 1 M solution of a strong base using the method continuous variation. Reviews results using several common acids. (SK)

Describes four activities for the elementary science classroom to help students develop their powers of description, explanation, and prediction. Topics of the activities are spool "gears," crystal comparisons, yeast magic, and clay cargo carriers. (DS)

Describes a physical science course for nonscience majors developed at California State University, Fullerton, to teach some of the basic principles and methodology of chemistry and physics using current environmental problems to stimulate students' interest. (HM)

Describes demonstrations using soap bubbles prepared from readily available materials to illustrate a number of scientific principles. (SK)

Describes concrete laboratory manipulations in which time and its measurement are studied while investigating the parameters affecting the functioning of a pendulum. Also describes the origin of pendula and how cultural and historical references are integrated into laboratory practice. (Author/JN)

Presents an overview of the construction techniques of dye lasers suitable for student projects and briefly describes possible laboratory projects. (JN)

An experiment is described relating activities with pendulums to the process skill of controlling variables. Includes materials needed, directions, and follow-up questions for the experiments. Lists five other experiments which could be used to teach the control of variables. (DS)

Describes an experiment to measure the thermal conductivity of some gases in an undergraduate physics laboratory using a hot wire method in the pressure range ten to one torr. (HM)

Presents excerpts from a teacher's manual which describes laboratory activities in genetics for advanced secondary school biology students. Maximized are the pedagogical aspects in choosing activities, arriving at intermediate decision-points, and planning the evaluation of pupil achievement. (CS)

Describes the infrared analysis of geological specimens which can form the basis of a laboratory exercise, allowing some minerals to be identified by "fingerprint" technique. Students can gain insight into the concept of symmetry and environment around an atom. (Author/SA)

Explains how CTR Wilson cloud chamber experiments can be simulated with simple low-cost apparatus. Described are the Wilson cloud chamber, colour rings, measurement of rings, and the apparatus. (DS)

Described are several experiments, for a course in geometrical optics or for a college physics laboratory, which have a bearing on ophthalmic optics. Experiments include the single thin prism, crossed prisms, and the prismatic power of a lens. (Author/DS)

Discusses an attempt to have students learn chemistry by conducting and discussing laboratory experiments in small groups largely independent of the teacher. The project results and the 30 experiments that student groups conducted are described. (WB)

Describes methods for studying the direct effect of thyroid hormones on the induction of metamorphic change in amphibians. (CS)