Discusses the need for student experiments involving the complete characterization of "unknown" inorganic compounds. Describes a project employing a complex metal compound. The compound contains six different components in both inert and labile complexions. Outlines the complete procedure and the preparation of the unknown compound. (TW)

Discusses the difficulties that beginning chemistry students have in understanding acid-base chemistry. Describes the use of conjugate acid-base charts in helping students visualize the conjugate relationship. Addresses chart construction, metal ions, buffers and pH titrations, and the organic functional groups and nonaqueous solvents. (TW)

Describes how a series of models can be constructed to illustrate the structure of eukaryotic chromosomes, emphasizing the structure of DNA. Suggests that by adapting a different scale for each series of models, a complete picture of the complex nature of the chromosome can be built up. (TW)

Provides some teaching tips for elementary teachers that are designed to enhance the natural interests of young children in science and help equip them with important science processing skills. Contains activities related to observation, classification, measurement, and communication. (TW)

Discusses some of the ways that a cabbage can be used to produce a universal indicator of pH. Describes the methods for producing the indicator, experiments students can do on ordinary household chemicals, and a student take-home assignment for producing pH indicators. (TW)

Assessed the level of cognitive demand inherent in the manner in which students were held accountable for activities and tasks in seventh grade life science classes. Notes that most tasks placed minimal cognitive demand on students, as they involved copying or simple step-by-step procedures. (SKC)

Reviews the results of the 47th Annual Science Talent Search sponsored by the Westinghouse Electric Corporation and the Westinghouse Foundation. Describes some of the projects done by students. Lists the names and schools of the 16- to 18-year-old winners. (CW)

Presents several classroom ideas to help students understand their relationship to and their place in the universe as well as how difficult it would be to find life beyond Earth. Lists activities for children including the "Map Procedure," the "Model Procedure," and "Good Ol' Sol." (CW)

Describes a lesson designed to help young students conceptualize cholesterol and its effects on the body. Provides young students with a concrete way to understand how cholesterol builds up in blood vessels and restricts blood flow. Includes a simple illustrative experiment for children to perform themselves. (CW)

Describes two chemistry demonstrations including a demonstration of chemical inhibition and "The Rayleigh Fountain" which demonstrates the polarity of the water molecule. Provides instructions and explanations for each demonstration. (CW)

Presents information about mammals that have hooves, including definitions and descriptions of their characteristics. Contains teaching activities such as "Build a Paper Pachyderm,""Do the Funky Trunk Dance,""A Horse of a Different Color," and "Horns and Antlers." A reproducible quiz is also provided. (TW)

Presents information about rodents and lagomorphs, including definitions and the characteristics of these animals. Contains teaching activities such as "Habitats for Hoppers,""Cartoon Gnawers," and "The Great Rodent Expedition." Reproducible handouts for two of the activities are provided. (TW)

Presents information about insectivores, including definitions and characteristics of shrews, moles, hedgehogs, and tenrecs. Contains descriptions of the teaching activities "Little Starnose" and "You and a Shrew." A reproducible worksheet is provided for use in "You and a Shrew." (TW)

Presents information on sea mammals, including definitions and characteristics of cetaceans, pinnipeds, and sirenians. Contains descriptions of the teaching activities "Whale Music,""Draw A Whale to Scale,""Adopt a Sea Mammal," and "Sea Mammal Sleuths." (TW)

Describes a computer program written in Microsoft BASIC for use on personal computers to calculate travel times of refracted waves in layered structures with arbitrary dipping interfaces. Exercises for student use are given to illustrate some of the basic properties of reversed refraction travel time graphs. (TW)