Describes an experiment in environmental chemistry which serves to determine the dissolved oxygen concentration in both fresh and saline water. Applications of the method at the undergraduate and secondary school levels are recommended. (CC)

Discusses the use of a central computer linked to a CRT console, with display projected onto a large screen, to operate computer augmentation of lectures in large group instruction. Indicates that both introductory tutorial and computer modes are feasible in subject matter presentation. (CC)

Discusses application of group theory to the teaching of selection rules in electronic and vibrational spectroscopy. Indicates that acquaintance with such a mathematical concept is essential for high school students to understand molecular spectrum courses. (CC)

Discusses application of Schoniger's method of quantitative organic elemental analysis in teaching of qualitative analysis of the halogens, nitrogen, sulphur, and phosphorus. Indicates that the oxygen flask method is safe and suitable for both high school and college courses because of simple apparatus requirements. (CC)

Summarizes the structures, shapes, linkages, chain lengths, and physical and chemical properties of polymers, copolymers, and proteins with a background of knowledge of monomer units. (CC)

Outlines experiments in which a density gradient might be used to advantage. A density gradient consists of a column of liquid, the composition and density of which varies along its length. The procedure can be used in analysis of solutions and mixtures and in density measures of solids. (Author/TS)

SI units come in two distinct types: fundamental (kilogram, meter) and descriptive (atom, molecule). Proper/improper uses of atom/molecule from historical cases are presented followed by a re-introduction of a light "wave (cycle)" unit and the clearly defined photon model which is deduced. Also examines omission of the fundamental unit "radon."…

Briefly compares/contrasts two learning theories. Purpose of the first is to inform while the second seeks to lead students to adjust understandings held about a field and/or a concept. Each theory is then related to the purpose of education, suggesting that the second is comparable with recent work in cognitive psychology. (JN)

Discusses some central ideas emerging from a systematic approach to teaching scientific problem-solving skills. Areas considered include: insights derived from naturalistic studies; effective problem-solving methods; problem-solving procedures; characteristics of the knowledge base (focusing on functional conceptual building blocks, knowledge…