Sulfa drug. When scientists isolated the active part of the prontosil molecule they discovered how it and all sulfa drugs work. Sulfa drugs contain a sulfur atom that has six total bonds (shared electrons) and six electrons of its own; this breaks the octet rule which states that atoms try to acquire eight electrons in their outer shell (not 12). Sulfur (and phosphorus) is element 16 on the periodic table; its elections are far enough to pond relatively freely with other atoms but close enough to be
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References: Stewart‚ D‚ 2012. (2012). Sulfur Element Facts. Available: http://www.chemicool.com/elements/sulfur.html. Last accessed 09/11/12. Winter‚M. (1993-2012). Copper: The essentials. Available: http://www.webelements.com/copper/. Last accessed 09/11/12.
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The Process Most electrophilic substitution reactions are irreversible but sulfonation is an exception. Treatment of benzene with "oleum" (a solution of SO3 in concentrated sulfuric acid) will give the sulfonic acid‚ the electrophilic species being sulfur trioxide which is Lewis acidic. Fig – 1 Sulphonation : Benzene equation The sulfonic acid can be converted back by treatment with hot aqueous acid. The reason for this reversibility is the fact that the Wheland intermediate is overall neutral and
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production of coal‚ a major industry in China‚ emits sulfur compounds‚ carbon and other byproducts into the air‚ which increases the risks of cancer‚ lung and heart issues. “Sulfur dioxide produced in coal combustion poses an immediate threat to the health of China’s citizens‚ contribution to about 40‚000 premature deaths a year” (Bradsher and Barboza). This not only affects the physical welfare of workers but anyone who is exposed to this tainted air. Sulfur dioxide emitted from coal combustion also contributes
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efficient drying agent‚ taking up moisture from the air and even abstracting the elements of water from such compounds as sugar and starch. The concentrated acid also acts as a strong oxidizing agent. It reacts with most metals upon heating to produce sulfur dioxide. (McGraw-hill science and Technology encyclopedia) (http://www.answers.com/topic/sulfuric-acid#ixzz1oDQ9MJCN) If a person is exposed to the fumes‚ it could cause irritation to the skin and eyes‚ if the liquid touches the skin‚ it can
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Unida Christian Colleges Unida St. Anabu I-F Imus‚ Cavite “Garlic as an Effective Insecticide” An Investigatory Project in Science Submitted by: Marielle Marie L. Camacam Christian D. Panganiban John Zebedee T. Barata Elisha Hope P. Villaruz Chelsy Anne Y. Buenabajo March 2012 Abstract Acknowledgements Table of Contents
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Eco-Industrial Parks: The Case for Private Planning Industrial ecologists are championing eco-industrial parks or EIPs as tools for pursuing sustainable development. An EIP is a community of companies located in one region that exchange and make use of each other’s by-products or energy. Among the best known is Kalundborg‚ Denmark‚ a city in which the major industries and the local government trade their waste streams and energy resources. Many commentators see Kalundborg as a model that should
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INTRODUCTION Extracts from black pepper discourage insect pests from laying eggs on leaves and pose lower risk to humans and the environment than other pesticides‚ a University of Ottawa researcher says. The more susceptible species were pine sawflies‚ which are passed on ornamental plants and caterpillars such as the eastern tent caterpillar Black Pepper worked better when insects are soft-bodied during the larval stage because the chemical is able to penetrate
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INTRODUCTION Sulphuric Acid is an important chemical‚ which has large-scale industrial uses. Its major user is the phosphate fertilizer industry. Other important applications are in petroleum refining‚ steel pickling‚ rayon & staple fiber‚alum‚ explosives‚ detergents‚ plastics and fibers etc. Sulphuric Acid Industry is very old and has been continuously adopting the technological developments. It started with Lead Chamber process followed by contact rocess with Single Conversion Single Absorption
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Investigatory Project CHAPTER 1 I. INTRODUCTION: Nowadays ‚people can’t oppose the boosting of the countless pests and insects that disturb our daily habits. Controlling of insects and pests is one of the main problems of most farmers and gardeners. So‚ instead of buying commercial and expensive inorganic insecticides‚ an alternative and economical insect repellant made up of the sap of euphorbia plant‚ garlic‚ and siling labuyo‚ all natural insecticides derived from different plants which
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