Presents some introductory experiments involving the reaction between EDTA and several metal ions using metallochromic indicators. The experiments represent familiar reactions and are followed by suggestions for extension into areas of discovery work by students. (Author/SA)

Discusses use of two central forms of argument, analogy and inference to the best explanation, in teaching college science. It is argued that science makes sense if the underlying reasoning makes sense, and this must be explicitly addressed in instruction. Therefore, forms of argument that link evidence to hypotheses or theories, and criteria for…

Describes an exercise whereby a biology class used a stairway to illustrate how fossiliferous rock strata were deposited, the oldest on the bottom and most recent at the top. Each step represents a dated boundary between adjacent geological ages, and each riser is labeled as a geological unit. Geological time is compressed to 365 days. Offers…

South African experiments with an intervention in university chemistry instruction are critiqued for their poor descriptions of the method, problems with research methodology and data, reliability and validity issues, and assumptions made about application of the intervention. The intervention, Academic Support Programs (ASP), taught…

A study at a South African university investigated the mathematical reasoning ability of 314 first-year chemistry students and 69 mathematics students regarding ratios and proportions in non-chemistry-related problems. Results indicated students' mathematical readiness in these areas was only weakly linked to their previous achievement in…

Presented are the three main theories that describe the pattern of evolution of geographic variants of H. sapiens--the multiregional model, the out-of-Africa model, and the gene-flow or hybridization model. The contributions of geneticists, paleoanthropologists, and the history of fossils are included. (KR)

Discussed is an activity that allows preservice teachers to write about their own relationships with science teachers and their experiences with hands-on science activities in an autobiography. Directions, excerpts from past autobiographies, and the implications are included. (KR)

Discussed are the importance of earth science, how earth science should be taught, and when and to whom earth science should be taught. Topics which should be taught in a modern earth science course are suggested. (CW)

Errors found in a common physics experiment to measure acceleration resulting from gravity using a linear air track are investigated. Glider position at release and initial velocity are shown to be sources of systematic error. (CW)

Described in this study are student teachers' frameworks of purity and the related concepts of the states of matter. The concept of natural versus pure substances, classifying states of matter, and implications for teaching drawn from the results are discussed. (Author/KR)

Described are several spreadsheet templates which use the functions of iteration and logical look-up which allow students to calculate and graph quantum mechanical functions and to simulate rotational and vibrational energy level and spectra. The templates are listed in the appendix. (KR)

Described is an experiment which may be carried out quickly using tungsten-filament irradiation. Materials, experimental procedures, and results are discussed. Procedures for filtration on silica gel are appended. (CW)

Safety issues specifically related to the analytical laboratory are discussed including hazardous reagents, transferring samples, cleaning apparatus, eye protection, and equipment damage. Special attention is given to techniques which not only endanger the technician but also endanger expensive equipment. (CW)

Presented is the course outline and proposed science content for this course. The structure, sessions, and evaluation of the course are discussed. (CW)

The principle means by which g has been measured are summarized. Discussed are "Kater's Reversible Pendulum," falling rules, and interferometry methods. Types of corrections and various sources of uncertainty are considered. (CW)