10/19/2011 Akruti Patel Lab Report #4: Determination of a chemical formula: the empirical formula of Magnesium Oxide 1. Purpose: Determine the empirical formula of magnesium oxide from the percent composition (this can found using the Analytical Method and the Synthesis Method). 2. Introduction: In the late eighteenth century‚ combustion has been studied extensively. In fact‚ according to Steven and Susan Zumdahl‚ Antoine Lavoisier‚ a French Chemist‚ performed thousands of combustion experiments
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contribution to water hardness‚ by convention hardness is reported as mg 〖CaCo〗_3/L of solution. Water with a hardness value less than 60 ppm is considered “soft” water‚ while water ≥ 200 ppm 〖CaCo〗_3/L is labeled as “hard”. How: Ethylenediamminetetraacetic Acid (EDTA) is a complex versatile chelating agent. A chelating agent is a substance whose atoms can form several bonds (ligands) to a single metal ion. Chelating agents are multi-dentate ligands. Multidentate ligands are many clawed‚ holding onto the metal
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Abstract The objective of this experiment was to observe multi-step purification of benzoic acid after performing the extraction from a mixture containing benzoic acid‚ cellulose‚ and methyl orange. Recrystallization was done to remove impurities from the sample. The amount of BA recovered during recrystallization is much less than the extracted amount of BA. The difference between the pure and impure samples was observed by comparison of melting points. It was found that impure samples will have
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Failure Analysis of the Ka-Loko Dam Break Disaster Name Institution Course Instructor Date Failure Analysis of the Ka-Loko Dam Break Disaster 1.0 Introduction 1.1 Overview Dams are control or water storage structures. Dams are considered as reservoirs when used for impounding water from streams. Generally‚ dam failures are known to pose catastrophic disasters to economic development‚ the environment and to human lives. In order to reduce the risk of disaster occurrence‚ it is imperative to investigate
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towards the weak. Instead‚ he sees the rational thing for the strong to do is to be indifferent towards them‚ in the same way that the wolf does not bother himself with the opinions or goings-on of lambs. From a certain perspective‚ because of Nietzsche’s admiration of strength‚ he seems to be open towards the weak empowering themselves and becoming strong – which would be a much more favorable fate for the weak than seen in many societies‚ where the weak are seen as the always-weak. Nietzsche seems
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WAS HITLER A WEAK DICTATOR? Introduction The question of whether Hitler was master in the Third Reich or a weak dictator’ is one of the central debates amongst historians of Nazi Germany. It is not necessary to spend too much time here outlining the debate‚ as this information can easily be found elsewhere (see‚ for example‚ the excellent chapter on this subject in Ian Kershaw’s The Nazi Dictatorship). Broadly speaking‚ historians who have participated in this debate can be located on a scale
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Lab Conclusion Guidelines A good conclusion should contain all of the following parts a) You should state what experiment was performed‚ and show any necessary reaction schemes. The reaction schemes should include molecular weights and any other important physical data for the reagents and products. Ex. Cyclohexanol was oxidized to cyclohexanone using sodium dichromate in the presence of sulfuric acid. * Note: you can download a free version of a structure editor from ACD labs‚ the PC version
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Acid in the human stomach When people refer to acid they usually see it as a corrosive liquid that can dissolve metals or change the color of a substance. So they think of acid as a dangerous matter for the body and believe it can easily dissolve your skin. What I have previously listed are indeed properties of certain acids‚ such as Hydrofluoric Acid which can cause irreversible tissue damage if it comes in contact with skin‚ but not all acids are this strong. As a matter of fact what a lot of
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Food Chemistry 138 (2013) 227–233 Contents lists available at SciVerse ScienceDirect Food Chemistry journal homepage: www.elsevier.com/locate/foodchem Analytical Methods Determination of volatile N-nitrosamines in meat products by microwave-assisted extraction coupled with dispersive micro solid-phase extraction and gas chromatography – Chemical ionisation mass spectrometry Man-Chun Huang‚ Hsin-Chang Chen‚ Ssu-Chieh Fu‚ Wang-Hsien Ding ⇑ Department of Chemistry‚ National Central
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effective government. It acted as though a loose confederation‚ or “firm league of friendship.” The Articles of Confederation created a weak central government that linked the thirteen states in common problems such as foreign affairs‚ and a judicial arm. Although‚ there was no executive branch‚ which meant no leader to enforce laws. Also‚ the Congress was weak (it was designed that way)‚ and therefore the government could merely advocate and appeal. The United States faced two main problems: the
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