NEON Sir William Ramsay‚ a Scottish chemist‚ and Morris M. Travers‚ an English chemist‚ discovered neon. Another important person is Georges Claude‚ a French chemist‚ who invented neon lighting around (1870-1960). Claude showed his first neon sign at the Paris Exposition of 1910. And then sold the first neon advertising sign to a Paris barber two years later. Around the 1920s‚ neon lighting had become popular in many parts of the world. In 1922‚ the Haaxman brothers brought the first neon signs
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Hindawi Publishing Corporation Abstract and Applied Analysis Volume 2012‚ Article ID 512127‚ 16 pages doi:10.1155/2012/512127 Research Article Positive Solutions of Eigenvalue Problems for a Class of Fractional Differential Equations with Derivatives Xinguang Zhang‚1 Lishan Liu‚2 Benchawan Wiwatanapataphee‚3 and Yonghong Wu4 1 School of Mathematical and Informational Sciences‚ Yantai University‚ Yantai‚ Shandong 264005‚ China School of Mathematical Sciences‚ Qufu Normal University‚ Qufu‚ Shandong
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Analysis of Hydrocarbons Jennifer Alambra‚ Ma. Nancy Anulat‚ Alfonso Apepe*‚ Jacqueline Arsenal 3Bio4 Department of Biological Sciences - College of Science‚ University of Santo Tomas‚ Manila ABSTRACT The unknown hydrocarbon sample was differentiated and characterized by the use of three tests. The outcomes of these tests are as follows: Nitration test (negative)‚ Bromine test (positive) and Basic Oxidation test (positive). From these results the unknown sample can be classified
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C hapter 2 IS MATTER AROUND US PURE How do we judge whether milk‚ ghee‚ butter‚ salt‚ spices‚ mineral water or juice that we buy from the market are pure? physical process of evaporation. However‚ sodium chloride is itself a substance and cannot be separated by physical process into its chemical constituents. Similarly‚ sugar is a substance because it contains only one kind of pure matter and its composition is the same throughout. Soft drink and soil are not single substances. Whatever the source
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1. What is in Gasoline? Gasoline is produced from a dark substance extracted from miles beneath the surface‚ called crude oil or petroleum. Millions of years ago‚ crude oil was created from fossil fuels of dead animals and plants that sank into the ocean’s bottom underneath rocks‚ dirt‚ and dust. Over time‚ the seclusion of corpses caused heat and pressure to increase instigating the bodies to decompose; and due to lack of oxygen‚ the remains formed mixture of chemical organic compounds made of hydrogen
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w w w e tr .X m eP UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS GCE Ordinary Level e ap .c rs om MARK SCHEME for the May/June 2011 question paper for the guidance of teachers 5070 CHEMISTRY 5070/21 Paper 2 (Theory)‚ maximum raw mark 75 This mark scheme is published as an aid to teachers and candidates‚ to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that
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• The equilibrium law DYNAMIC EQUILIBRIUM forward A +8 reaction ""r=====~’~ reverse reaction Most chemical reactions do not go to completion. Once some products are formed the reverse reaction can take place to reform the reactants. In a closed system the concentrations of all the reactants and products will eventually become constant. Such a system is said to be in a state of dynamic equilibrium. The forward and reverse reactions continue to occur‚ but at equilibrium
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of rates of reaction. 1.2 Methods of purification and analysis Candidates should be able to: (a) describe methods of purification by the use of a suitable solvent‚ filtration and crystallization‚ distillation and fractional distillation‚ with particular references to the fractional distillation of crude oil‚ liquid air and fermented liquor; (b) suggest suitable methods of purification‚
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Ramsay’s previous discoveries of helium and argon are what inadvertently led to the discovery of krypton (Stewart). Around the time of the discovery‚ Ramsay and Travers planned to extract a large volume of argon from the air‚ liquify the argon‚ and use distillation to discover a lighter element that would fit between helium and argon (Stewart). Since the two chemists had little experience with liquid gases‚ they used liquid air to practice the procedure (Stewart). To begin‚ Ramsay and Travers
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preparation should not exceed 10 slides. Roll nos 1-5 6-11 12-17 18-23 Topic for the ppt solutions suspensions colloids Separation techniques a)chromatography b)centrifugation c)crystallisation Separation techniques a)evaporation b)distillation c)fractional distillation a)metals and non metals b) compounds and
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