Describes how the home toilet tank can be used as either a classroom problem or experiment that provides a simple introduction to process control. (HM)

Reports results of a questionnaire surveying opinions of university chemistry departments (N=34) that used integrated experiments in lower- and upper-level chemistry courses. Reviews general problems and advantages inherent in the use of this kind of experiment, which brings together material from several different areas of chemistry. (CS)

Describes a physical chemistry laboratory experiment that illustrates the concepts of inductive and resonance effects by the calorimetric determination of the heats of protonation of pyridine, 2-chloropyridine, and 3-chloropyridine. (CS)

Gives four science lessons for third graders concerning combustion, density, static electricity, and air pressure and surface tension. (RH)

Describes an experiment on heat that utilizes only a styrofoam cup of coffee and a soda straw thermometer. (BT)

This experiment designed for beginning physics students, is related to postal regulations restricting the size of envelopes. A graph is constructed that allows for testing the mailability of envelopes. (MP)

An exercise is presented which demonstrates the determination of sample purity by differential scanning calorimetry. Data and references are provided to enable the exercise to be carried out as a dry-lab experiment. (BB)

The gravimetric determination of calcium as calcium carbonate is described. This experiment is suitable for undergraduate quantitative analysis laboratories. It is less expensive than determination of chloride as silver chloride. (BB)

This demonstration uses the electrophoresis of indicators to demonstrate the principles involved in the separation of isoenzymes. (BB)

Describes an experiment to characterize the enzyme polyphenol oxidase. Includes Purpose, Reagents and Equipment, Procedure, Extraction, Treatment of Data, and Discussion. (MA)

Describes an experiment in which Fresnel diffraction patterns were observed with a beam of slow neutrons of wavelength 4.33 Angstroms. (MLH)

Language arts and science activities are combined in a program based on the adventures of an imaginary character. (DD)

Describes a variation of "the suffocating candle" activity used to develop the process of predicting based on reliable data. Instead of using jars of varying sizes under which the burning time of candles is measured, the same jar is used while the candle is elevated on varying numbers of blocks. (CS)

Presents a chemistry experiment to illustrate the solubility behavior of an indicator in its neutral and ionic state and the consequences of acidity and basicity. (NB)

Presents activities in which students explore the conditions necessary for a candle to stay lit. Enables students to construct an accurate concept to explain their observation of water rising inside a tube in which a candle has burned out. (JRH)