Describes a laboratory experiment that uses a programmable calculator and the concepts of activity and activity coefficients to examine the effect of ionic strength on equilibrium constants. (LH)

Describes an experiment that illustrates the role of hydrogen bond formation in producing a heat of reaction when ethanol and water are mixed. (MLH)

Describes a laboratory procedure for identifying carbon-14 labelled acetic acid by first converting it to acetophenone, then oxidizing the labelled carboxyl with permanganate. (MLH)

Describes a method for determining the rate constants of enzyme reactions involving two substrates with the use of double reciprocal plots. (MLH)

Describes a procedure for performing an enzyme assay colorimetrically on tyrosinase obtained from fruits and vegetables. (MLH)

Describes an experiment involving gas-liquid chromatography of fatty acid methyl esters in petroleum ether solution. (MLH)

Found that in an introductory biology course at the University of Massachusetts Amherst, adoption of the Data Aggregation Project (free software that allows students in a course to aggregate a large body of data for some particular problem) resulted in an increase in the number of data points students analyzed per semester by a factor of almost…

Examines computer based simulations of practical laboratory experiments in engineering. Discusses the aims and achievements of lab work (cognitive, process, psychomotor, and affective); types of simulations (model building and behavioral); and the strengths and weaknesses of simulations. Describes the development of a centrifugal pump simulation,…

Attempts to answer two research questions: (1) Does the use of a digital camera in laboratory activities increase student learning?; and (2) Does the use of digital cameras motivate students to take a greater interest in laboratory work? Results indicate that the digital camera did increase student learning of process skills in two biology…

Explains the benefits and risks of genetically-modified foods and describes methods for genetically modifying food. Presents a laboratory experiment using a polymerase chain reaction (PCR) test to detect foreign DNA in genetically-modified food. (Contains 18 references.) (YDS)

Introduces a laboratory activity on biological diversity that focuses on mollusks and trees. (YDS)

Describes a classroom demonstration supported by the guided-inquiry experience that focuses on separation techniques and other solvent-dependent processes, such as reaction-solvent selection. (Contains 13 references.) (YDS)

Describes the Graduate K-12 Project, which is funded by the National Science Foundation (NSF) and provides fellowship to graduate and highly qualified undergraduate students in the areas of science, mathematics, engineering, and technology to serve in K-12 schools with teachers. Aims to improve communication and teaching skills of fellows,…

Describes the structure of an in-depth laboratory project chemical engineering. Provides modeling work to guide experimentation and experimental work on heat transfer analysis. Discusses the experimental results and evaluation of the project. (YP)

Discusses the validity of studies of Spanish pronunciation in terms of research methods employed. Topics include data collection in the laboratory vs. in a natural setting; recorded vs. non-recorded data; quality of the recording; aural analysis vs. spectrographic analysis; and transcriber reliability. Suggestions for improving data collection are…