Describes an improved experiment of the thermal dehydration of copper (II) sulfate pentahydrate. The improvements described here are control of the temperature environment and a quantitative study of the decomposition reaction to a thermally stable oxide. Data will suffice to show sequential gravimetric analysis. (Author/SA)

Unusual experiments in sound are described. Sounds produced from the vibration of areas are represented by many beautiful sand patterns. The vibrating areas vary from square to circular plates. (SA)

Simple laboratory investigations are given which expose elementary students to optical crystallography techniques. Procedures and materials are designed for sixth-grade students. (SA)

Tips are given for collecting and identifying diatoms for use in secondary school biology classes. Collecting sites described vary from freshwater to terrestrial habitats. (SA)

The laboratory experiment described here is intended to be of use to the forensic science major enrolled in a course in organic chemistry. The experiment is the use of thin-layer chromotography for qualitative analysis, specifically for the identification of drugs. (Author/SA)

Presented here is a laboratory experiment for a course in physical chemistry. Students are requested to directly measure the degree of orientational order in a liquid crystal at room temperature. A minimum amount of equipment is necessary. (Author/SA)

Describes a typical relaxation kinetic experiment using a sudden increase in the temperature of the system. Time involved is described as minimal and the approach as quicker, more accurate, sensitive, and producing simultaneous determination of several thermodynamic parameters. (Author/SA)

Describes an energy resources ranking simulation program for high school and college students. This program has the major objective of illustrating the complexity of issues concerning energy by involving students in a decision-making process that will call upon information from different disciplines. (HM)

Contains a series of laboratory exercises students can do to introduce them to the basic concepts and techniques of water purification. (Author/MA)

Describes a sundial contest used to generate interest and enthusiasm in astronomy class. Presents diagrams of three basic types of sundials, a sundial time correction form, and guidelines for a successful contest. (MA)

Presents a nuclear power plant simulation game which is designed to involve a class of 30 junior or senior high school students. Scientific, ecological, and social issues covered in the game are also presented. (HM)

Explains how to use sticky tape, a soda straw, and a little water to build a device which will demonstrate Charles' law as well as give the temperature. (GA)

Checks on the logarithmic property of the eye in receiving light, by using estimation methods of how much brighter a light bulb looks than does its image in a window glass. (GA)

Presents a method of studying RLC circuits with the help of the oscilloscope in the XYZ mode, complemented by an electronic device which generates a marker-trace on the screen and which is used to measure frequencies without the need of a reference point on the screen. (Author/GA)

Describes the care and maintenance of a freshwater aquarium in the classroom. Includes a chart indicating organisms, special uses, and care. (MA)