9 Results
Reactions of Nitric Acid   
(Movie/Animation, Audio/Visual (7))
These demonstrations illustrate the production of nitric acid and its reaction with various forms of calcium carbonate found in nature, namely marble, limestone, chalk, and eggshell.
Reactions of Sulfurous Acid   
(Movie/Animation, Audio/Visual (5))
These demonstrations illustrate the production and effects of sulfur dioxide, a pollutant generated by the burning of sulfur impurities in coal. The sulfurous acid produced by dissolving sulfur dioxide in water is allowed to react with various forms of calcium carbonate found in nature, namely marble, limestone, chalk, and eggshell.
Chemical Properties of Sulfur Dioxide   
(Movie/Animation, Audio/Visual (4))
Reactions involving sulfur dioxide.
Acid Base Reactions of Sulfur Dioxide   
(Movie/Animation, Audio/Visual (3))
Acid base reactions involving sulfur dioxide are shown.
Ozone: Absorbance of UV Light   
(Movie/Animation, Audio/Visual (3))
Ozone is produced. Exposure to a shortwave ultraviolet source causes the ozone to cast a shadow against a fluorescent yellow background.
Atmospheric Pollution   
(Movie/Animation, Audio/Visual (3))
The formation and effects of acid rain and other pollutants are simulated.
(Movie/Animation, Audio/Visual (14))
Formation of formaldehyde copolymers, nylon rope, high and low density polyethylene, combustion of polyethylene and polystyrene, Beilstein test, formation of solid latex, cleaning oil spills, slime, solid foams, super absorbent polymer, formation of polyurethane foam under normal and micro gravity, and construction of a rod climbing apparatus are demonstrated.
Cl2O4 in the Stratosphere   
(Instructional Material (1))
The depletion of ozone in the stratosphere is caused chiefly by ozone reacting with chlorine and bromine from industrially manufactured gases. Several small chlorine oxide molecules are involved in the catalytic cycles that lead to the destruction of ozone. In this comprehensive project, students use computational chemistry to investigate a larger chlorine oxide, Cl2O4.
Molecular Models of Volatile Organic Compounds   
(Article (1))
This month's Featured Molecules come from the Report from Other Journals column, Nature: Our Atmosphere in the Year of Planet Earth, and the summary found there of the paper by Lelieveld et al. (1, 2) Added to the collection are several volatile organic compounds (VOCs) that are emitted by a variety of plants. The term VOCs is a common one in environmental chemistry, and is interpreted quite broadly, typically referring to any organic molecule with a vapor pressure sufficiently high to allow for part-per-billion levels in the atmosphere. Common VOCs include methane (the most prevalent VOC), benzene and benzene derivatives, chlorinated hydrocarbons, and many others. The source may be natural, as in the case of the plant emissions, or anthropogenic, as in the case of a molecule such as the gasoline additive methyl tert-butyl ether (MTBE).The oxidation of isoprene in the atmosphere has been a source of interest for many years. Several primary oxidation products are included in the molecule collection, although a number of isomeric forms are also possible (3).The area of VOCs provides innumerable topics for students research papers and projects at all levels of the curriculum from high-school chemistry through the undergraduate courses in chemistry and environmental science. Along the way students have the opportunity for exposure to fields such as epidemiology and toxicology, that may be new to them, but are of increasing importance in the environmental sciences. The MTBE story is an interesting one for students to discover, as it once again emphasizes the role that unintended consequences play in life. An exploration of the sources, structures, reactivity, health and environmental effects and ultimate fate of various VOCs reinforces in students minds just how interconnected the chemistry of the environment is, a lesson that bears repeating frequently.