This instructional unit uses an intuitive approach in introducing the concept of congruent transformations. Extensive use is made of worksheets and manipulative methods. In the latter stages, the SSS, ASA, and SAS theorems are presented. The unit concludes with geometric proofs requiring the use of the fact that corresponding parts of congruent…

Computer-assisted instruction (CAI) has proven useful in teaching chemistry instrumentation techniques to undergraduate students. The work completed at the time of this interim report has clearly shown that a general purpose laboratory computer system, equipped with suitable devices to allow direct data input from experiments, can be an effective…

Indicates how the gas laws can be derived and taught to high school and college physical science classes by using the guided-discovery method. (LS)

Explains: (1) use of piezoelectric film (connected to power supply and oscilloscope) to reveal force-versus-time curves of bouncing balls; (2) use of bound wood splints or meter sticks to illustrate tree or tower stability; and (3) apparatus of co-axial discs with connected linking rods and suspended bobs to simulate waves. (DH)

Presents some strategies that have been used to overcome problems in instructional areas of introductory biology programs. Focuses on maintaining an emphasis on inquiry, developing the process of science, the design of process laboratory activities, reducing cookbook laboratory orientation, and educating staff. (CW)

Describes a basic biotechnology investigation that includes restriction and ligation of plasmid DNA, transformation of bacteria and cloning of these bacterial cells. Discusses laboratory procedures and another activity in the identification of unknown plasmids by studying agarose gel electrophoresis photographs. (CW)

Introduces an experiment exhibiting blue and yellow-orange coloration in the plane of vibration of a vibrating string. Provides pictures and the experimental set-up. (YP)

Describes several experiments that explore the methodology available to the forensic serologist for typing a human bloodstain in the ABH grouping system. Presents ABO blood group of wet blood, Lattes Crust test procedure, and the absorption-elution procedure. Uses outdated blood; equipment requirements are minimal. (ML)

Outlines a multistep project involving oxidation of cholesterol, isomerization of an enone, and reduction of delta-4-cholesten-3-one. Featured is the last stage in which the ring junction is set stereospecifically. Recommends two laboratory periods to complete the reaction. (ML)

Describes a physical organic experiment in thermodynamics and kinetics for undergraduate courses in organic chemistry, biochemistry, or physical chemistry. Details background information, solution preparations, equipment and methods, and the suggested experiments such as determination of general-base-catalytic coefficients and the Bronsted…

Describes two introductory exercises designed to teach the fundamental ideas and methods of crystallography, and to convey some important features of inorganic and organic crystal structures to students in an advanced laboratory course. Exercises include "The Crystal Structure of NiO" and "The Crystal Structure of Beta-Fumaric Acid." (CW)

Describes a technique of impregnating small amounts of sandy sediment in a quick curing resin for microscopic examination. Details the preparation of materials. Suggests laboratory exercises based on this preparation. (CW)

Presents an analog of radioactive decay that allows the student to grasp the concept of half life and the exponential nature of the decay process. The analog is devised to use small, colored, plastic poker chips or counters. Provides the typical data and a graph which supports the analog. (YP)

Introduces a demonstration kit for understanding conductivity by using several fruits and vegetables. Provides a parts list and assembly instructions for the "lemon screamer." (YP)

Introduced is an inexpensive laboratory apparatus for first-year high school chemistry students. Presents information on materials, construction procedures, and activities for students. (YP)