EXTRACTION OF METALS SUMMARY Most metals exist in compounds in rocks in the Earth’s crust. Many of these ores contain oxides or sulphides of the metals. The compounds need to be reduced to produce the metals as elements. Metals are very useful to us because of their special properties. Reduction means removal of oxygen or gain of electrons. Carbon is a good chemical reducing agent because it readily combines with oxygen‚ but it is only useful for the metals below it in the Reactivity
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Metal fabrication is the building of metal structures by cutting‚ bending‚ and assembling processes: Cutting is done by sawing‚ shearing‚ or chiseling (all with manual and powered variants); torching with hand-held torches (such as oxy-fuel torches or plasma torches); and via numerical control (CNC) cutters (using a laser‚ mill bits‚ torch‚ or water jet). Bending is done by hammering (manual or powered) or via press brakes and similar tools. Modern metal fabricators utilize press brakes to either
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1. What is the total value of RJR Nabisco under (a) the pre-bid operating strategy? (b) the Management Group’s operating strategy? (c) KKR’s operating strategy? Approach We used the APV approach to value the company under each of the three scenarios. To do so‚ we needed to find the free cash flow‚ debt tax shield‚ and the discount rate‚ which is ra. This rate should be applicable across all three scenarios‚ because it is not dependent on the operations of the company. We then needed to value
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SCH 3U0 May 7th 2013 Percent Yield of Calcium Carbonate Introduction: The purpose of this experiment is to examine the percent yield of a precipitate in a double displacement reaction. A solution of calcium citrate and sodium carbonate were mixed together‚ then the products were filtered out as so only the precipitate remained. The filtered paper was then dried and the mass of the precipitate in the experiment divided by the theoretical mass of the precipitate from the calculated gave the
Free Stoichiometry Chemical reaction Sodium
following 2 labs experimented the more enzymes and substrates added to the concentration will effect the reaction rate. Our second lab‚ we tested enzyme and substrate concentrations to determine the increase of temperature and inhibitor. The enzyme source used in both labs was peroxide‚ guaiacol is used as a substrate for peroxide. We used Guaiacol‚ turnip extract‚ peroxide and distilled water for enzyme and substrate concentration. In the second lab we used the same substances in lab one‚ however
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Lure of precious metals: Precious metals were a major pull factor for the west because everybody was looking for the opportunity to become wealthy individuals which was known as the American dream at that time. Gold and silver was the metals that every single person was looking for in the westward expansion‚ immigrants and citizens were willing to kill to get their hands on any gold or silver mine. The killing‚ weirdly enough‚ was mostly was the removal of Indians. The India wars: War was inedible
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In this particular situation we didn’t add enough PGLO into the DNA so ours didn’t glow. In the control lab a different outcomes was observed in each of the four plates. In the LB/amp/arabinose agarose plate containing the +pGLO sample‚ fluorescent green colonies developed. This is because the gene which codes for the fluorescent protein‚ GFP‚ is located near the beta lactamase gene on the pGLO plasmid‚ which protects bacteria from the antibiotic ampicillin. When the cell produced beta lactamase
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1. Problem Identification: Identify the issue(s) that management or the people involved in the case must address. 2. Issue Analysis: Perform the appropriate analysis and evaluation (e.g.‚ Stakeholder‚ VRINE‚ SWOT‚ PESTLE‚ and other analyses). 3. Actionable Recommendations: Build a set of actionable strategies‚ which must be well reasoned‚ argued and supported with significant evidence. The Company Background: Château de Margaux‚ located in the Bordeaux region of France‚ has been profitable
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Resources‚ Conservation and Recycling 21 (1997) 145–173 Metals recycling: economic and environmental implications Robert U. Ayres * INSEAD‚ Boule6ard de Constance‚ F-77305‚ Fontainebleau‚ France Received 17 July 1997; accepted 27 July 1997 Abstract We are in a period of economic transition. The ‘cowboy economy’ of the past is obsolescent‚ if not obsolete. Environmental services are no longer free goods‚ and this fact is driving major changes. Recycling is the wave of the (immediate) future
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Chemical Prperties of Metals Most metals are chemically reactive‚ reacting with oxygen in the air to form oxides over changing timescales (for example iron rusts over years and potassium burns in seconds). The alkali metals react quickest followed by the alkaline earth metals‚ found in the leftmost two groups of the periodic table. Examples: 4Na + O2 → 2Na2O (sodium oxide) 2Ca + O2 → 2CaO (calcium oxide) 4Al + 3O2 → 2Al2O3 (aluminium oxide) The transition metals take much longer to
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