Describes an investigation for physical science and chemistry students that engages students both physically and mentally. (ZWH)

Describes activities concerning interference phenomena derived from illuminated rotating soap films. Suggests reflecting incident light off of the soap film onto a projection screen. Discusses several possible experiments, how to make soap solutions, and vibrating soap films. (MVL)

Describes an activity that demonstrates the effect of specific variables on the acidity of coffee. (ZWH)

Presents an activity in which students gather their own snowflake collection in search of matching crystals. Students stretch plastic wrap over embroidery hoops that provide a snowflake-catching surface. Snowflakes are viewed under a microscope and photographed. (MDH)

Presents an activity that is part of the National Science and Technology Week (NSTW) 1993. Students apply principles of biomechanics to find the most effective techniques for performing a standing broad jump and use that analysis to improve their own jumping. Instructions include procedures, materials needed, and possible extensions to the…

Describes a set of experiments using a UV-VIS spectrometer to identify food colorings and to measure the pH of soft drinks. The first laboratory component uses locations and shapes of visible absorption peaks as a means of identifying dyes while the second portion uses the spectrometer for determining pH. (PVD)

Explains that some metal springs have an initial tension that must be overcome before using the F=kx relationship (Hooke's Law) for experimental calculations in the physics laboratory. (WRM)

Explains how to determine the polarity of static electric charges by using an electrician's tool called the test pencil. (WRM)

Suggests specific ways in which laboratory activities might be slightly modified to increase students' understanding in science, based on recommendations from the National Science Education Standards and on constructivist understandings of the learning process. Contains 42 references. (WRM)

Presents a science experiment about oil spills and oil pollution for 7th- and 8th-grade science students. This variation on a method used by pollution control experts to clean up oil spills shows students how oil is collected after an oil spill, explaining that with this method, much of the damage from an oil spill can be averted. (SM)

Introduces a science experiment in which students investigate the wind-leaf relationship by using a leaf blower. Assesses damage differences between leaf species under wind stress. (YDS)

Presents a laboratory experiment on determining the molecular weight of an unknown molecule by using gel filtration chromatography. Describes the procedure and lists required materials. (YDS)

Presents a lab exercise that introduces students to the concepts of community structure, succession, and adaptation by having them make detailed observations from two or more stone walls differing in some historical, environmental, or physical variable. (ASK)

Presents a method to measure the mass of a definite amount of a gas that occupies a known volume at a given pressure in order to determine experimentally the root mean square speed of molecules of a gas. (JRH)