A student experiment that uses QuEChERS (quick, easy, cheap, effective, rugged, and safe) methodology for extraction and HPLC for quantitative determination of tocopherols from seeds and nuts is described here. Chromatographic separation is achieved by using a pentafluorophenyl stationary phase which gives enhanced separation of the tocopherols…

Describes a procedure based on the assumption that during the rated lifetime of a light bulb roughly half of the radius of the filament evaporates. Explains how the filament's operating temperature can be deduced. (DDR)

Reports the results of an experiment with undergraduates in a physics laboratory that indicates that preparation before a lab session improves student performance in the lab. Also concludes that follow-up work can lead to meaningful learning. (DDR)

Outlines the aims and principles underlying recent reforms in the junior school physics course in China. Focuses on developing students' abilities and the benefits of experimentation rather than the simple transfer of knowledge from teacher to students. (DDR)

The chemical and instrumental methods used in the study of transition-metal complexes provide a complete determination of their structure, bonding, and properties. It unites concepts of analytical, inorganic, and physical chemistry in a way that students might appreciate that these areas of chemistry are not different.

Many words which have been treated in the denotative sense are actually connotative in nature. That is to say that citing a definition or stating a fact should not be a learning goal. Rather, a "conceptualization" should be what teachers are striving for. A series of activities dealing with density have been provided for demonstrations or…

Reports on the 9th Biennial Conference on Chemical Education sponsored by the American Chemical Society. The conference theme: "Chemistry: Learning, Instructing, Presenting," was addressed by numerous sessions. Highlighted were presentations calling for an increase in process-oriented chemistry teaching, reduction of "science…