Gives an explanation to the process of charging the conventional leaf electroscope, by induction, using a charged insulated rod. (GA)

A new, small magnetic susceptibility system is described which can be constructed from commercially available components for less than one hundred dollars for use with a standard laboratory balance. (BB)

A lecture demonstration is presented for comparing titration curves. A plot of pH vs volume of strong base is produced by connecting the external output of a pH meter to a strip recorder. Thus, pH is recorded as a function of time. (BB)

In this experiment, students prepare, isolate, and characterize two geometrical isomers of a metal coordination compound. This experiment provides a good introduction to the techniques of modern coordination chemistry. (BB)

Describes a laboratory project for first-year biology students that examines competition among various cellular slime molds. After a brief introduction to the topic of competition and basic life history information about cellular slime molds, students choose a question and design original experiments to seek an answer. (Author/AIM)

Describes an approach for making chemistry relevant to everyday life. Involves the study of kinetics using the decomposition of hydrogen peroxide by vegetable juices. Allows students to design and carry out experiments and then draw conclusions from their results. (JRH)

Presents experiments with polarized light for grades 8-12 which can produce colorful effects with a minimum of equipment and can illustrate many principles of physics, chemistry, and geology. (MKR)

Presents a set of activities for testing consumer products to encourage students to learn how to use scientific investigations in their everyday lives. Describes the penny flip experiment and testing a detergent. Students learn in a hands-on manner the importance of completing accurate laboratory reports, which allows them to analyze results and…

Describes a science and math activity that involves bubbles, shapes, colors, and solid geometry. Students build geometric shapes with soda straws and submerge the shapes in soapy water, allowing them to review basic geometry concepts, test hypotheses, and learn about other concepts such as diffraction, interference colors, and evaporation. (TJQ)

Described is an activity in which students are able to determine that DNA can be transferred between bacteria and should be able to predict the type of DNA transferred. Methods, materials, and results are discussed. (CW)

Provides historical background, descriptions, uses and basis for identification of diatoms. Explains collection, dry-mount cleaning, and preparation procedures of the algae. Cites additional resources. (RT)

Describes the construction and operation of an apparatus used to study the optical properties of solids using reflection. (JRH)

Presents activities to teach students the science concept known variably as center of gravity, center of mass, center of balance, or balance point. Gives examples of activities for the exploration phase of study, concept introduction phase, and concept application phase. (TJQ)

Presents a simple, practical, and inexpensive method for growing microorganisms that will help middle school students experience microorganisms and introduce them to important science concepts. Students grow microorganisms and investigate questions concerning environmental factors that affect growth of populations. (LZ)

Describes a technique for extracting a radioactive source from the atmosphere using a balloon, as a strategy to generate students' enthusiasm for and understanding of radioactivity experiments. (JRH)