The use of Calculator-Based Laboratory (CBL) technology, the graphing calculator, and the cooling and heating of water to model the behavior of consecutive first-order reactions is presented, where B is the reactant, I is the intermediate, and P is the product for an in-class demonstration. The activity demonstrates the spontaneous and consecutive…

The study describes how to design and optimize an experiment with multiple factors and multiple responses. The experiment uses fractional factorial analysis as a screening experiment only to identify important instrumental factors and does not use response surface methodology to find the optimal set of conditions.

Describes the serendipitous discovery of paths left by charged particles in the magnetic deflection unit outside of a cyclotron. Offers suggestions for their occurrence. (CP)

Presents three lapidary activities which have been developed to teach enrichment courses to adults and young people. Described are activities and materials for polishing and shaping rocks. (EB)

New equipment and apparatus for use in chemical education and research are discussed. (MLH)

Describes how to clear water from gas taps in the laboratory using simple equipment. Includes a diagram of the equipment set-up. (BR)

Described are two experiments using electronic circuits designed for the activities. The first experiment is Ruchardt's experiment and the second demonstrates the distribution of velocity of electrons. (RH)

Indicates dangers inherent in the use of polythene or polypropylene sinks and presents alternatives to their use. (GS)