A study was conducted to examine the structural order-disorder transformation promoted by controlled heat treatment using X-ray diffraction technique (XRD) and photoluminescence (PL) techniques as tools to monitor the degree of structural order. The experiment was observed to be versatile and easily achieved with low cost which allowed producing…

The construction of a fluorometer and a spectrofluorometer using flashlight or a sunlight excitation source in a shoebox and the eye as a detector is being described. The assembly helps in understanding several fundamental ideas related to the subject very easily.

Crystals of naphthalene form on the surface of an acetone solution and dance about in an animated fashion illustrating surface tension, crystallization, and intermolecular forces. Additional experiments reveal the properties of the solution. Flows within the solutions can be visualized by various means. Previous demonstrations of surface motion…

Degradative enzymes in over-the-counter products from pharmacies and health food stores provide good examples of biological catalysis. These include [beta]-galactosidase in Lactaid[TM], [alpha]-galactosidase in Beano[R], [alpha]-amylase and proteases in digestive aids, and proteases in contact lens cleaners. These enzymes can be studied…

The twenty experiments in this text have been designed to give the scientific glassblowing technician the opportunity to use scientific glass apparatus in the study of physical science. Primary emphasis of these experiments is on the practical application of the physical science program as a working tool for the scientific glassblowing technician.…

This article describes how a gas chromatograph may be used to determine the amount of carbon dioxide in exhaled air. The experiment has been used as part of a demonstration exercise at a local science fair and proved of interest to all age groups. (Author/BB)

The use of the earthworm as a laboratory animal for studying the effect of starvation on nitrogen metabolism is discussed. Simple techniques and methods are presented allowing in vivo physiological responses to be compared with changes in the enzyme potential of gut tissue. (Author/MA)

Reports an experiment demonstrating the existence of the oscillatory phenomenon in the manganese +2 catalyzed reaction between citric acid and potassium bromate. (SL)

Reports on an organic chemistry laboratory experiment of the bromination and nitration of benzene to illustrate the nature of electrophilic aromatic substitution reactions. (SL)

Describes an advanced physical or inorganic chemistry experiment in determining the rate law of chemical reactions which demonstrates unusual behavior of k-obs. (SL)

Describes an introductory photochemistry experiment using the ohotohydration of pyridine in aqueous solutions to illustrate many physical aspects of photochemistry. (SL)

Describes an experimental demonstration of entropy utilizing a rubber band. (SL)

Describes an experiment demonstrating the frustration of totally reflected visible light. (SL)

Describes procedure for making X-ray photographs on Polaroid 3000 black and white roll film. (SL)