The research reported here consists of the introduction of an intervention based on a series of laboratory activities combined with concept mapping. The purpose of this intervention was to enhance student understanding of acid-base chemistry for tenth grade students' from two classes in a Turkish high school. An additional aim was to enhance…

Guided-inquiry experiments offer the same opportunities to participate in the process of science as classical organic qualitative analysis used to do. This three-week guided-inquiry project involves an aldol-dehydration synthesis of a chalcone chosen from a set of nine, followed by a catalytic transfer hydrogenation reaction using ammonium formate…

Recent federal education policies and reports have generated considerable debate about the meaning, methods, and goals of "scientific research" in mathematics education. Concentrating on the critical problem of determining which educational programs and practices reliably improve students' mathematics achievement, these policies and reports focus…

In the exciting, "out of this world" activity described here, students measure the Earth using meter sticks while measuring their shadows in two distant locations. To obtain the size of the Earth, students discover the connection between the measurements of the shadows and a model of the spherical Earth following the method developed by…

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.…

Obtaining the consent of human participants in the conduct of research is a growing concern in research circles, particularly in university settings. Informed consent is the agreement of a person, or an authorized representative, to participate in a research activity. The paper offers suggestions for obtaining informed consent. (NG)

Describes an engineering course that stresses various philosophies and methodologies of experimentation, along with the techniques of experimental synthesis. (MLH)

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)