Discusses the passive role that students often take in large classes and argues for teaching methods such as cooperative learning that place students in a more active learning environment. Examines the advantages and potential drawbacks of cooperative learning for large classes and provides suggestions on preparing for group work. (DDR)

Describes an activity that enables students to understand that there are many substances and odors carried in the flow of water. Students identify and describe a variety of natural and introduced materials found in bodies of water, and observe the effects of silt, sand, gravel and odor sources on water. (DDR)

Provides details of experiments that deal with the use of operational amplifiers and are part of a course in instrumental analysis. These experiments are performed after the completion of a set of electricity and electronics experiments. (DDR)

Presents a detailed procedure for finding an empirical formula from ion exchange chromatography and colorimetry. Introduces students to more varied techniques including volumetric manipulation, titration, ion-exchange, preparation of a calibration curve, and the use of colorimetry. (JRH)

Discusses a companion course designed to accompany an introductory chemistry course for preservice teachers. Includes examples of curricular materials and student work. (DDR)

Reports on a study of a pilot model of a laboratory training course that provides preservice secondary science teachers the opportunity to explore pedagogical possibilities and gain hands-on experience running a general chemistry lab. (DDR)

Explores the perspective of American suburban Midwestern high school chemistry students on the motivations for and implications of a particular form of classroom questioning behavior. Discusses the effects of the social atmosphere in high schools on scientific inquiry. (Author/KHR)

Introduces an activity in which students learn principles of force and motion, systems, and simple machines by exploring the best position of the dogs on the dashboard. Includes a sample lesson plan written in the five instructional models: (1) engagement; (2) exploration; (3) explanation; (4) elaboration; and (5) evaluation. (KHR)

Describes an activity based on shrinkable thermoplastics in which students explore the percentage of shrinkage of a plastic ruler when it is heated. Includes science content knowledge behind the shrink, national science education standards related to this activity, and a complete guide. (KHR)

Describes an inquiry investigation to enable students to understand water cohesion, surface tension, and heating curves for water. The investigation includes several activities organized in a three-phase learning cycle: (1) exploration; (2) concept invention; and (3) concept application. (DDR)

Discusses some uses of questionnaires and surveys in educational research. Describes different kinds of closed and open form questions, offers suggestions for finding questionnaires for use, and describes methods of data analysis. Includes practical suggestions for using questionnaires in the chemistry classroom. (PVD)

Presents the case for the use of bogs as ideal sites for hundreds of interdisciplinary lessons that combine chemistry, geology, various branches of biology, and wetlands archaeology. Includes general guidelines to aid in the design of interdisciplinary bog studies. (DDR)

Describes a project that was designed to teach scientific writing but also proved to be useful in teaching general research skills. Involves students designing and conducting their own research projects using common household chemicals and equipment available in their homes. Discusses project structure, pedagogy, and outcomes. (JRH)

Describes a radiation experiment developed to complement a new environmental chemistry laboratory curriculum. A scintillation counter is used to measure radon in water. The procedure relies on the fact that toluene will preferentially extract radon from water. Sample preparation is complete in less than 90 minutes. Because the level of…

Encourages the incorporation into lecture of live experiments that can be predicted or interpreted with abstract models. A demonstration is described where the position of the predominant peak of 1,1'-diethyl-4,4'-cyanine iodide is measured in class using an overhead projector spectrometer, then predicted using the model of a particle in a…