Details a simple quantitative experiment to measure the percent of oxygen in air. (DKM)

Discusses the impact of various factors on the "charring reaction" of a carbohydrate with concentrated sulfuric acid including the type of sugar, the degree of fineness of the sugar crystals, and the amount of water added. (JRH)

Describes a DNA profile technique that was performed by a group of high school juniors and seniors. (JRH)

Highlights glucosinolates-a family of secondary metabolites from plants of high culinary and nutritional value. Describes experiments that demonstrate the enzymatic degradation of glucosinolates. Teaches students about the distribution, variation, chemistry, and function of a family of natural products important in plant protection, food spicing,…

Describes an apparatus for crystal growth that was designed to study growth kinetics of small crystals from solutions and to obtain crystals of various substances. Describes the use of the apparatus in laboratory practical experiments in the field of crystal growth physics within the course "Solid State Physics". (JRH)

Presents activities that involve the separation and identification of dyes from mouthwashes and the determination of their alcohol content. Provides a review of various analytical techniques and shows students that more than one instrument or technique may be required to analyze a product. (JRH)

Describes the design and construction of a safe student quantitative conductivity apparatus. Discusses experimental results. (JRH)

Describes an apparatus that is stable and accurate enough for quantitative conductivity experiments but maintains the simplicity of construction and use as well as low cost. Discusses principles and implementation and the performance of the assembled apparatus. (JRH)

Presents an experiment that challenges the claim that sprouting radish seedlings release chemicals into the environment that inhibit germination of lettuce seeds. Reports that although no simple allelopathic demonstration was observed, the experiment provides fertile ground for further experimentation in inquiry-based laboratory experiences. (JRH)

Describes a chemistry outreach program where graduate student volunteers perform shows to excite high school students about science. Lists the experiments and demonstrations performed in the shows, and concludes that this outreach benefits both the high school student audience and the graduate student volunteers. Contains 21 references. (JRH)

Describes an experiment to measure the acceleration of a bungee jumper. Uses energy considerations to explain this anomalous acceleration and presents experimental results using several different types of ropes and a chain. (JRH)

Describes a simple and reliable test method used to investigate the corrosion-inhibiting effects of various chelating agents on aluminum pigments in aqueous alkaline media. The experiments that are presented require no complicated or expensive electronic equipment. (DDR)

Presents investigations of leaf surface wetness that provide ideal opportunities for students to explore the relationships between leaf form and function, to study surface conditions of leaves and plant physiology, and to make predictions about plant adaptation in different environments. Describes simple procedures for exploring questions related…

Presents 6 short experiments with liquid nitrogen that 12- and 13-year-old students can safely perform under close supervision. Helps the students in learning a number of basic chemical principles while spurring their curiosity and showing them how much fun chemistry can be. (JRH)

Tells the story of an experiment conducted by Galileo and proves that a light pebble and a heavy rock travel with equal speed when dropped from the same distance and touch the ground at the same time. Indicates the importance of open-mindedness and tolerance. First published in 1939. (YDS)