Presents two demonstrations to compare the differences between the screen reproductions of a bulb when using a converging lens and a pinhole and how that reproduction image reaches the observer's eye from multiple vantage points. (MDH)

Describes four experiments that enable students to explore the phenomena of evaporation and condensation and determine the relative humidity by measuring air temperature and dew point on warm September days. Provides tables to calculate saturation points and relative humidity. (MDH)

Presents activities that utilize balloons to encourage students to explore questions related to scientific concepts. Concepts explored include light, heat, charged ions, polarization, and the sense of smell. (MDH)

Presents an activity in which students investigate the formation of solid ammonium chloride aerosol particles to help students better understand the concept of acid rain. Provides activity objectives, procedures, sample data, clean-up instructions, and questions and answers to help interpret the data. (MDH)

Describes the use of Vee maps in helping students understand scientific investigations. (PR)

Describes a unit on magnetism that utilizes hands-on activities in which students make hypotheses for discrepant behavior, discover whether a magnet attracts one object through another, measure the strength of magnets, explore levitating paper clips, and play a game dependent on magnetic attraction. (MDH)

Describes a classroom experiment designed to teach students the fundamentals underlying the normal coordinate analysis procedure of a polyatomic molecule. Uses a reverse procedure from traditional experiments of this type by providing the values for the force field and working backwards. (TW)

Lists 25 energy activities and describes two experiments (materials needed and procedures used included) for secondary/middle school students. Like activities for younger children listed in part 1 (appearing in Vol. 65, No. 229), these activities are designed to provide concrete experiences for teaching various aspects of the energy concept. (JM)

This teacher's guide is part of a program of activities that help secondary-level students develop the complex thinking skills needed to succeed in science. This program can be used with current curriculum materials. It is designed to help students integrate ideas and develop concepts that demonstrate higher level thinking. A rich environment of…

Describes the construction of durable, inexpensive and large sand-hourglasses for use in controlled experiments that allow students to observe, infer, measure, record data, and predict. This hands-on activity is designed to take place over a three-day interval. Includes materials needed, techniques, procedures, follow-up activities, and resource…

Conceptual change teaching is an instructional method that helps students modify, extend, or exchange their alternative conceptions for the appropriate scientific conceptions. Provides activities and a diagnostic test to apply the method to the concepts of heat and temperature. (MDH)

Uses capillarity as an example of a problem in physics which has been explained mathematically in two different ways. Argues that only one explanation is indeed valid and demonstrates this opinion through experimentation and discussions. Proposes that mathematics should be used in physics as a tool to predict, not to explain. (TW)

Describes an investigation of the strategies used by 47 high school students in solving volumetric analysis problems in chemistry. Reports that students in the high ability group mainly used the "formula" approach, while those in the low ability group tended to use the "proportional" approach to problem solving. (TW)

This document contains a set of instructional materials about photosynthesis that were used in a research study of middle school science teaching during 1985-86. The Middle School Science Project investigated ways to help middle school science teachers use teaching strategies that were identified in earlier studies as particularly effective in…

This document contains a set of instructional materials about cellular respiration that were used in a research study of middle school science teaching during 1985-86. The Middle School Science Project investigated ways to help middle school science teachers use teaching strategies that were identified in earlier studies as particularly effective…