Describes an experiment that illustrates the role of hydrogen bond formation in producing a heat of reaction when ethanol and water are mixed. (MLH)

Describes a method for determining the rate constants of enzyme reactions involving two substrates with the use of double reciprocal plots. (MLH)

Describes a procedure for performing an enzyme assay colorimetrically on tyrosinase obtained from fruits and vegetables. (MLH)

Presents six papers that were presented at a one-day symposium dealing with the influence of textbooks on chemical education. Specific topics include textbooks in inorganic, organic, analytical, and physical chemistry, and the history of chemistry textbooks in the United States. (MLH)

Discusses an equation that describes the variation with temperature of acid dissociation constants. (MLH)

Presents questions and answers concerning chemical aspects of air pollutants and the metabolism of drugs and poisons. (MLH)

Briefly discusses historical attitudes toward the divergence between the arts and sciences; describes a team-taught course in the literature of technology. (MLH)

Discusses a course designed for large numbers of underprepared chemistry students at a large metropolitan university; an evaluation of the course based on student performance in succeeding courses is included. (MLH)

Discusses the concept of educational efficiency of instructional methods, and suggests that although lab reports are effective learning tools, they are inefficient as an evaluation method. (MLH)

Describes an experiment involving gas-liquid chromatography of fatty acid methyl esters in petroleum ether solution. (MLH)

Describes a senior seminar format designed around broad year-long subjects. This alleviates disconnectedness by building upon material learned weekly. One format highlight is that students choose topics from a list for reading, research, and background preparation to lead a discussion. They also submit research papers on their topic. The new…

Presents a case study of an experienced high school chemistry teacher. Examines the teacher's conceptions about teaching science and compares them with the observed patterns of practice. Highlights the complexity of characterizing a teacher's thinking and its relationship to actions. Discusses the value of the insight researchers gain from sharing…

Recommends a number of techniques and transitional activities to bridge the gap between traditional cookbook activities and the type of inquiry envisioned by the National Science Education Standards. Includes discussion on techniques related to safety and the habits of good scientists. (DDR)

Profiles Anna Kasov, veteran high school chemistry teacher disturbed by society's messages that chemistry is not women's work. Kasov tries to create an emotionally safe classroom atmosphere for both sexes. She suggests that teachers model intellectual risk-taking, encourage students to play with ideas, require students to treat classmates'…

Compares the precision, accuracy, and response of a cooking probe to a standard mercury thermometer in side-by-side heating in temperature baths, simple and fractional distillations, and melting point determination. (DDR)