Two demonstrations are described: (1) a variant of preparing purple benzene by phase transfer catalysis with quaternary ammonium salts and potassium permanganate in which crown ethers are used; (2) a corridor or "hallway" demonstration in which unknown molecular models are displayed and prizes awarded to students correctly identifying the…

Describes an experiment which illustrates the general aspects of intermolecular energy transfer between triplet states in rigid solutions of organic compounds solved in an ethanol-ether mixture. Measurements of quenching and energy transfer processes are made using the chemicals of benzophenone and naphthalene. (CS)

Procedures are described for preparing spores from the fern, water clover, for an educational demonstration of germination and sexual reproduction. The demonstration is recommended for biology instructors who want to illustrate the alternation of phases in plants. (SA)

Describes how an elementary teacher can incorporate science into the classroom even if he/she feels unsure in the realm of science. Emphasis is on using processes of science. (SA)

This undergraduate biochemistry experiment introduces the student to techniques for cell lysis and release of protein from the cell in soluble form, ion exchange and gel chromatography, and dialysis. (Author/BB)

Describes an experiment suitable for an instrumental analysis or quantitative analysis course. (BB)

This experiment can be used as either a demonstration or a laboratory activity illustrating the principles of affinity chromatography to purify an enzyme. (BB)

Describes a physics exercise designed for biology and premed majors. The activity is a low intensity laser light scattering laboratory exercise to determine the diameter of micron-sized latex spheres (simulated microbes) in water suspension. (GA)

Presents a recipe for the Nylon Rope Trick, which is considered to be one of the most spectacular demonstrations in chemistry. Materials for growing the polymer and some safety precautions are given. (SA)

Three methods are given for the synthesis of N-4 substituted sulfonamides. An example elucidates the procedures involved in one of the methods. The example is intended as a model for students. (SA)

Provides a set of plans for constructing a plant incubator for the classroom. Illustrations are provided as well as lists of materials and tips for rearing the plants. (SA)

Part one of a three-part series about noise pollution and its effects on humans. This section presents the background information for teachers who are preparing a unit on sound. The next issues will offer learning activities for measuring the effects of sound and some references. (SA)

Provides teaching tips for a visit to the zoo. Includes zoo manners, background information on vertebrates, and activities to do during and after the field trip. (MA)

Describes the construction and use of a star projector built from an overhead projector and high-impact polystyrene plastic. Includes patterns for the star charts and the projector frame. (MA)

Presents two exercises in astronomy: (1) the production of star trails and (2) the measurement of the distance between stars and their apparent movement in the sky. Includes directions, illustrations, and activity questions. (MA)