This article describes how a gas chromatograph may be used to determine the amount of carbon dioxide in exhaled air. The experiment has been used as part of a demonstration exercise at a local science fair and proved of interest to all age groups. (Author/BB)

This article looks at the problems of revision of laboratory courses. While revision of the syllabus of experiments is expensive, it is necessary to keep it up to date. The nature, causes, and rates of change in practical courses are discussed. (BB)

Described is a gel diffusion experiment that permits the completion of duplicate diffusion runs within a three-hour laboratory session. Information included for the short-duration gel diffusion experiment is the diffusion cell, the experiment, data treatment, and the expected results of the experiment. (Author/DS)

Described is a procedure for the study of condensation polymerisation. The objectives of this study are to help students understand concepts that are somewhat abstract in nature (i.e., polymerisation) through derivation of equations that help to describe and predict the particular phenomena. (CS)

Described is a conductiometric method for following the course of diffusion of aquated ions through a cellulose membrane. Several experiments using the method are described. (Author/SA)

Describes a student project in analytical chemistry using sheet silicates. Provides specific information regarding the use of phlogopite in an experiment to analyze samples for silicon, aluminum, magnesium, iron, potassium, and fluoride. (CS)

Discusses an experiment which illustrates the non-mixing properties of water at normal temperature with oil because of water's strong, open-ended hydrogen bonding interactions. Examples of the mixing properties between non-interacting substances and the near-complete mixing between water and solvents with limited H-bonding capacity are also given.…

Describes an experiment in environmental chemistry which serves to determine the dissolved oxygen concentration in both fresh and saline water. Applications of the method at the undergraduate and secondary school levels are recommended. (CC)

Discusses the use of aluminum chloride and other Friedel-Crafts type catalysts to polymerize 2-methylpropene and the application of such products in industry and agriculture. Includes a laboratory experiment on the polybutene preparation suitable for high school purposes. (CC)

Discusses application of Schoniger's method of quantitative organic elemental analysis in teaching of qualitative analysis of the halogens, nitrogen, sulphur, and phosphorus. Indicates that the oxygen flask method is safe and suitable for both high school and college courses because of simple apparatus requirements. (CC)

Discusses the design of two experiments on the reactions of 1-Chloro-1, 2-diphenylethane and of C-5 halides with nucleophiles in an inservice teacher course. Indicates that the material can be applied in teaching chemistry at both secondary and college levels. (CC)

Describes an experiment which yields low-volatility phenylacetylene, and suggests the use of the liquid product to examine alkyne chemical reactivity in organic chemistry courses. (CC)