Provides procedures, apparatus, and pre- and postlaboratory questions for an inexpensive, unsophosticated experiment that determines the approximate value for Avogadro's number. (CS)

A science and social studies unit developed around rosin is described. Students develop an understanding of the processing of raw material from a plant source into a commercial product and how to protect wood from weathering by preparing, testing, and evaluating varnish and shellac for their wood protective qualities. (Author/DS)

Discusses distillation of liquid mixtures with the emphasis on experimental work. A number of experiments, intended for chemistry secondary school teachers in the United Kingdom, are included. (HM)

Describes an experiment which makes use of a number of concepts from geometrical optics. The apparatus and method which is intended for students in elementary college physics classes are included. (HM)

Describes a student field project involving the estimation of a maximum rate of erosion for a local area. Identifies the factors influencing erosion and outlines the method of investigation. (GS)

Describes a clock reaction resulting from the reaction of paraquat with base. (CS)

Describes an organic chemistry experiment demonstrating the effect of temperature on reactivity as measured by reverse phase high performance liquid chromatography. (CS)

Presents an undergraduate analytical chemistry experiment that promotes an interpretation of the molecular aspects of solute partitioning, enhancing student understanding of separation science and liquid chromatography. (CS)

Described is an apparatus for determining the Curie temperature of a Ferromagnetic material which enables large specimens to be heated up to a maximum of 1100K in 20 minutes. Included is the theory, magnetic circuit apparatus, electrical circuit, and results using this apparatus. (DS)

Described is a praparium, a completely sealed and self-contained living aquarium. Steps on how to set up the aquarium, cautions, and a list of suggested aquarium plants and fish are included. (DS)

Describes urinalysis techniques for dry weight measurement, examination of urinary calculi (stones), and determination of the presence of blood and blood pigments. Also presented are directions for preparing required reagents. (WB)

Outlines a procedure where chromatographic separation can be easily done and provides an introduction to column chromatography. (CS)

Presents a viable laboratory experiment that demonstrates the utility of IR spectroscopy. Uses small quantities of deuterated gaseous alkanes. (CS)

The literature on crowding in residential and laboratory settings is reviewed, and a model of crowding highlighting the importance of perceived control and group orientation is discussed. (EF)

Suggests how elementary teachers can go beyond the science text and use commonplace materials to create science experiments which sharpen students' observational skills and their ability to formulate testable hypotheses. Seven experiments are outlined, using materials such as paper, cotton socks, and mayonnaise. (SJL)