2.6 Contemporary methods of managing waste Throughout the annals of human development and societal evolution‚ man has always found methods and strategies of alleviating the risks posed to his survival by natural occurrences or even by acts provoked by his own relation to the environment. Considering the fact that today’s waste are different from yesterday’s waste although building up over time‚ the researcher explores the current methods of managing waste in light of the complexities and compositions
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Electronic waste From Wikipedia‚ the free encyclopedia For the EC directive‚ see Waste Electrical and Electronic Equipment Directive. Defective and obsolete electronic equipment. Electronic waste‚ e-waste‚ e-scrap‚ or waste electrical and electronic equipment (WEEE) describes discarded electrical or electronic devices. There is a lack of consensus as to whether the term should apply to resale‚ reuse‚ and refurbishing industries‚ or only to product that cannot be used for its intended purpose
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GRADE 11 CHEMISTRY (30S) Final Practice Examination Answer Key GRADE 11 CHEMISTRY (30S) Final Practice Examination Answer Key IInstructions The final examination will be weighted as follows Modules 1–3 Modules 4–6 The format of the examination will be as follows: Part A: Fill-in-the-Blanks Part B: Multiple Choice Part C: Short Answer Total Marks Include units with all answers as required. Useful Information You will need the following in order to complete this examination: n n n n 15–20% 80–85%
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Preparation u Alcohols when heated in presence of H2SO4‚ H3PO4‚ P2O5‚ Al2O3 or BF3 undergo loss of water molecule with the formation of alkene. Conc. H2SO4 180oC H3PO4/P2O5 200oC Al2O3/BF3 350oC CH3-CH=CH2 + H2O CH3-CH2-CH2-OH CH3-CH=CH2 + H2O CH3-CH=CH2 + H2O u u Mechanism: In the first step OH group of the alcohol is protonated in a fast reversible reaction. Unlike OH group‚ protonated OH group is a good leaving group. Step 1: CH3 CH3-C-CH3 + H+ HO CH3 CH3-C-CH3 H2O+
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Buddy Holly’s Influence on Music The 1950s was a very influential time for the United States as well as the world. Music was changing‚ teenagers were gaining more freedom‚ and music was evolving into something no one had heard before. In a time where rebellious teens were looking for a new sound‚ and a new look‚ Buddy Holly came forth as the ideal artist to comply. Holly’s well receipted look and sound started with an early love for music. Born Charles Hardin Holley‚ into a Texan family in
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) 0620/01 October/November 2008 45 Minutes *6400528663* READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Write your name‚ Centre number and candidate number on the
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National Institute Of Fashion Technology HYDERABAD Masters of Fashion Management 2013-2015 Fashion Buying & Merchandising .Precious Jewellery Necklaces. By: Submitted to: Dhwani Shah Dr. G.H.S. Prasad Sara Mahdi Introduction Necklaces have existed since our ancestors began to walk upright on the earth. Our desire to adorn ourselves has been evident
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Catalysis: Midterm Review LECTURE 1: Sept 6th 2012 What is catalysis‚ Importance of catalysis‚ Industrial relevance‚ presentation of the course What is Catalysis: Catalyst: * catalyst is substance that increases the rate at which a chemical reaction approaches equilibrium‚ but is not consumed in the process * not reagent or product; noted above equation arrow * participates in kinetic equations‚ but not in eq constant Catalytic Cycle: * succession of chemical changes
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education *4308315385* CHEMISTRY Paper 2 Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number‚ candidate number and name in the spaces at the top of this page. Write in dark blue or black pen. You may need to use a pencil for any diagrams‚ graphs or rough working. Do not use staples‚ paper clips‚ highlighters‚ glue or correction
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THIS IS A LEGACY SPECIFICATION H Thursday 26 January 2012 – Morning GCSE GATEWAY SCIENCE ADDITIONAL SCIENCE B B623/02 Unit 1 Modules B3 C3 P3 (Higher Tier) * B 6 2 0 7 6 0 1 1 2 * Candidates answer on the Question Paper. A calculator may be used for this paper. Duration: 1 hour OCR supplied materials: None Other materials required: • Pencil • Ruler (cm/mm) * B 6 2 3 0 2 * INSTRUCTIONS TO CANDIDATES • • • • • • Write your name‚ centre number
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