Short reports contributed on a variety of topics in chemistry are presented. (CP)

A variety of topics in physics are covered by these contributed teaching and laboratory equipment suggestions. (CP)

Associates science teacher "bad days" with the inability to answer the questions asked by students. Proposes that publications focus on providing the answers to recurring questions experienced by science teachers. (CP)

Describes the operation of the computer program and a sample print-out is provided. (CP)

Presents a laboratory exercise that illustrates stoichiometry, limiting reagents, and proportionality. Highlights the safety and low cost factors of this exercise. Outlines procedures for the students. (ML)

Discusses the development of a design task in which the students can focus on problems in some part of the city. Describes such an improved strategy for teaching the design of complex systems as challenging and beneficial, especially for those interested in urban-related careers. (CC)

Presents a teaching unit on the Langmuir absorption isotherm suitable for advanced secondary school chemistry classes. Describes the experimental investigation of the isothermal adsorption of sulfur dioxide on charcoal, and discusses the derivation of the Langmuir equation and some applications. (JR)

Describes the procedure for making a quantitative analysis of organic compounds suitable for secondary school chemistry classes. Using the Schoniger procedure, the organic compound, such as PVC, is decomposed in a conical flask with oxygen. The products are absorbed in a suitable liquid and analyzed by titration. (JR)

Describes a project involving the integration of inorganic and organic chemistry by a study of copper determination involving an organic complex. (TS)

Examines student and teacher perceptions about the purpose and effectiveness of laboratory work at Year 10. The views of students and their teacher on the goals, conduct, and assessment of laboratory work were compared. Findings suggest that the relevance of laboratory work to everyday life could be made clearer to students. This may entail…

Introduces an alternative method to determine the mechanics of a moving object that uses computer vision algorithms with a charge-coupled device (CCD) camera as a recording device. Presents two experiments, pendulum motion and terminal velocity, to compare results of the alternative and conventional methods. (YDS)

Outlined are materials and testing procedures in which various plant species are screened to determine if they are producing antibiotics. Diagrams are included. (RT)