Features a checklist of structural questions for writing a laboratory report discussion. Presents a rationale for this method of helping students organize their thoughts. (DDR)

Uses crepe paper for the introduction of spectrophotometric concepts. Dyes used in the manufacturing of the crepe paper dissolve rapidly in water to produce solutions of colors. The variety of colors provides spectra in the visible spectrum that allow students to grasp concepts of absorption and transmission. (AIM)

Presents an experiment that investigates the temperature of tungsten filaments using a car headlamp. Uses a spreadsheet program that facilitates extensive data manipulation. Gives students an awareness of the many mathematical techniques used in data analysis. (Author/JRH)

Discusses a number of important laboratory-related terms worthy of consideration and suggests a classification scheme that may be used to rate individual activities while implying a direction to enhance such exercises. Highlights implications of classifying laboratory activities and clarifying laboratory vocabulary. Contains 11 references. (JRH)

Suggests that because controlled experiments are used extensively by professional ecologists to solve both theoretical and applied problems, experimentation should be a key component of secondary school ecology curricula. Describes five teaching principles to guide secondary school biology teachers in providing a more realistic view of the…

A teacher of students with hearing impairments outlines ways to integrate use of the scientific method into science laboratory experiences. A sample experiment is outlined, and the value of the applied science experiences for students who are concrete learners is stressed. (DB)

Presented is a brief history of manufacturing chocolate and an outline of production methods. Describes laboratory techniques used to monitor liquid chocolate viscosity. Discusses a simple experiment which can be performed in the classroom. (Author/CW)

To integrate a research/discovery component into one course, an experiment using the sea urchin embryo system is introduced because the teacher manages only one organism and students provide the variables. The materials, handling methods, and experimental methods of the experiment are described. (YP)

Described is an experiment which uses an autotrophic bacterium to anaerobically oxidize hydrogen sulfide to sulfate in a batch-stirred tank reactor. Discusses background information, experimental procedure, and sample results of this activity. (CW)

Describes the theory and application of an atomic fountain which pushes the atoms by laser pulses. Discusses the applications in measuring atomic properties and in building an atomic clock. (YP)

Proposes a simple procedure based on an expansion of the exponential terms of Raoult's law by applying it to the case of the benzene-toluene mixture. The results with experimental values are presented as a table. (YP)

Described is a simple demonstration of fermentation. The materials needed, the basic experimental set-up, and various projects are outlined. Included are a diagram of an apparatus for measuring carbon dioxide production and a table showing typical results of the effect of pH on fermentation. (RT)

Suggests caregivers can help children learn about the concept of light using simple conversation and activities. Offers directions for activities in which children can consider the following questions about light: where does light come from?; can you see without light?; what blocks light?; how does light travel?; can you make a shadow?; and does…

Describes an experiment designed to disprove the belief that an electrical field originating from a point inside a closed conducting surface cannot produce an electric field outside this surface. (ZWH)

Describes an experiment to study the motion of a rocket-propelled vehicle over the entire duration of the engine burn using a video system with a frame-by-frame playback and a Sonic Ranger for ultrasonic position movements. Enables students to study the impulse-momentum principle and the effects of a time-varying force. (JRH)