Class 1 Metallic bonding: Found in metals and alloys‚ 1‚ 2‚ or 3 valence electrons that are not bound to any particular atom in the solid. They drift throughout the entire metal. This results in a sea of electrons. These free electrons result in good electrical and heat conductivity. Coordination number is 8 or 12 (number of nearest neighbors). Ionic Bonding Found in compounds that are composed of both metallic and nonmetallic elements. Metallic element gives up valence electrons to the
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2012 Nelson Hudspeth‚ Ed Lapine‚ Thai Phi‚ Nevan Phillips Ton Dong A 4/1/2012 2012 Nelson Hudspeth‚ Ed Lapine‚ Thai Phi‚ Nevan Phillips Ton Dong A 4/1/2012 International Marketing Plan -Vietnamese Steel Industry International Marketing Plan -Vietnamese Steel Industry Executive Summary “Quality – Prestige – Sustainable Growth” is the motto of Ton Dong A. In order to assess the viability of expanding Tong-Dong A’s expansion into the United States market this analysis covers the Environmental
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http://www.ejchem.net ISSN: 0973-4945; CODEN ECJHAO E-Journal of Chemistry 2012‚ 9(2)‚ 980-987 Design‚ Synthesis and Docking Studies of a Novel Ciprofloxacin Analogue as an Antimicrobial AGENT S.JUBIE*‚ R. KALIRAJAN and PAVANKUMAR YADAV‚ Department of Pharmaceutical Chemistry J.S.S. College of Pharmacy‚ off campus - JSS University‚ Mysore jubiejawahar@gmail.com Received 31 July 2011; Accepted 4 October 2011 Abstract: The carboxylic acid group of ciprofloxacin was modified and amino mercapto triazole
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Earth’s four spheres Hydrosphere - dynamic mass of liquid that is always on the move Oceans - the most prominent feature of the hydrosphere 71% of Earth’s surface is covered by ocean which is 97% of Earth’s water Only 3% is fresh water - streams‚ lakes‚ glaciers and underground supplies Water Cycle - constantly recycles water Atmosphere Provides us with the air we breathe Protects us from the sun’s intense heat and radiation Protects us from space Biosphere Includes all life on Earth Interacts and
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Abstract: The purpose of this lab was to synthesize triphenylmethanol from benzophenone and bromobenzene by the formation of a Grignard compound with the reagents bromobenzene and magnesium metal. The bromobenzene was first transformed into the Grignard compound and was then reacted with the benzophenone to make the final product. The mixture was then mixed with sulfuric acid and the organic layer was extracted via a separatory funnel. The mixture was then recrystallized from methanol and was allowed
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Binding curves: CD can be used to monitor the binding if s substrate to a protein. The substrate can give a very different CD spectrum when free in the solution relative to when bond in solution. Outside of farUV: 180-240nm. 1. Near UV CD: 240n-320nm‚ Aromatic amino acids and disulphide bonds. 2. Visible CD: d-d transition in some metal protein complexes for eg Cu (II) prion. Principles of Chromatography
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Minerals Eight most abundant elements in the Earth’s Crust: Abundance % by weight – Most common Ionic Form Most Common Coordination Numbers Relative Ionic Size Oxygen (O) 46.6 % O-2 - - - 1.40 Silicon (Si) 27.7 % Si+4 Si (4) 0.26 Aluminum (Al) 8.1 % Al+3 Al (4‚ or 6) 0.39 Iron (Fe) 5.0 % Fe+2 Fe (6) 0.63 Calcium (Ca) 3.6 % Ca+2 Ca (8) 1.00 Sodium (Na) 2.8 % Na+1 Na (8) 0.99 Potassium (K) 2.6 % K+1 K (8‚ 12) 1.37 Magnesium (Mg) 2.1 % Mg+2 - - - 0.72 Distinction between crystalline and non-crystalline
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Introduction to the Lanthanides r understand that lanthanides differ in their properties from the s- and d-block metals; r recall characteristic properties of these elements; r appreciate reasons for their positioning in the Periodic Table; r understand how the size of the lanthanide ions affects certain properties and how this can r understand how to obtain pure samples of individual Ln3+ ions. 1.1 Introduction Lanthanide chemistry started in Scandinavia. In 1794 Johann Gadolin succeeded in
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FOUNDATION IN SCIENCE INTRODUCTION TO PRACTICAL ORGANIC CHEMISTRY – MAKING AND PURIFYING ORGANIC COMPOUNDS Stage 1 – Deciding how much reagent to use Most organic reactions do not go to completion; most reach an equilibrium position with significant quantities of reactants still remaining. In addition‚ separating the desired product from the rest of the reaction mixture‚ and then purifying it‚ will result in the loss of more of the product. The amount of product obtained expressed as a percentage
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the hard parts like bones and teeth. These hard parts lose their original mineral composition or structure. Their remaining parts either get recrystallized or replaced by other minerals such as silica and iron pyrites. This is called a fossil. Recrystallization means exchange of one chemical by another within the skeleton which results in a coarser‚ perhaps heavier structure. Many fossils consist of original hard parts of the animal as well as minerals taken from the surrounding rocks. This process
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