The development of a computer program, called UC SIGNAL, that permits a student to develop a diagram of a control system configuration using an IBM AT or a PS/2 computer is described. The features of UC SIGNAL and its contribution to process control instruction are discussed. (KR)

An activity in which students obtain a growth curve for algae, identify the exponential and linear growth phases, and calculate the parameters which characterize both phases is described. The procedure, a list of required materials, experimental conditions, analytical technique, and a discussion of the interpretations of individual results are…

Synthesizes existing, isolated bits of information on U.S. secondary student enrollment in advanced science courses. Among the findings for grades 10, 11, and 12, the percentage of those students enrolled in Advanced Biology is 20, 26, and 54. Advanced Chemistry is 0, 33, and 67; and Advanced Physics is 0, 10, and 90. (PR)

The purpose of this study involving 12 classrooms was twofold: (1) to understand the conceptual frameworks that sixth-grade students use to explain the nature of matter and molecules, and (2) to assess the effectiveness of 2 alternative curriculum units in promoting students' scientific understanding. Results reveal that students' entering…

Describes a course, "Great Ideas in Science," for undergraduate nonscience major students. The course emphasizes a few key overarching concepts in physics, chemistry, geology, and biology to introduce students to the essential aspects of science without getting involved in the complex vocabulary or rigorous mathematical derivations. (PR)

The principles of magma addition and liquid layering in magma chambers can be demonstrated by dissolving colored crystals. The concepts of density stratification and apparent lack of mixing of miscible liquids is convincingly illustrated with hydrous solutions at room temperature. The behavior of interstitial liquids in "cumulus" piles…

Demonstrations to help students change their misconceptions about chemical bond breaking are presented. Students' misconceptions about chemical bonds in both biological and chemical systems are discussed. A calculation for the release of energy from respiration is presented. (KR)

Hands-on activities that use water, candles, powders found in the kitchen, and bubbles to provide a lesson on chemical change are presented. Directions for conducting the activities and a list of needed supplies are provided. (KR)

Explored are ways in which spreadsheets can be used in the teaching of chemistry. Some of the limitations of using algebraic modelling tools are highlighted. Several example applications are provided. (CW)

Determined was the effect that cooperative groups heterogeneously based on proportional reasoning ability have on problem solving in regular and honors high school chemistry. Characteristics of successful and unsuccessful problem solvers individually and in groups are discussed. (KR)

Discussed are expert systems development and teaching, the representation and processing of knowledge, knowledge representation in chemical engineering, and expert systems in chemical engineering. The seven phases of expert system development are illustrated. (CW)

Discusses searching from remote workstations by novice undergraduate users based on experiences at Furman University (South Carolina). Highlights include CD-ROM databases versus online searching, including costs; electronic resources at Furman University, including a special lab for biology and chemistry majors; front-end search aids; and software…

Discusses some of the definitions of successful instruction stated or implied by researchers in science education and examines reasons for the diversity of definitions. Describes how a high school chemistry teacher decides whether his or her instruction is successful and how these assessments influence instructional practices. (PR)

Explains how a useful stereo image for overhead projection can be easily produced using technology available to most teachers. Red and green transparency films and red/green glasses are used to produce the three-dimensional view. (PR)

Provides a student worksheet and set-up instructions for a science experiment to demonstrate the concept of density. Students are asked to explain the phenomenon in which a liquid of lower density placed in the bottom of two vertical flasks flows up to replace the liquid of higher density in the upper flask. (MDH)