Experiment 1 Separation of Mixtures Summary of Principles: Most of the materials we encounter in everyday life are not pure substances. Many materials such as sand are formed from physical combination of various substances‚ and are called mixtures. Mixtures can be classified into homogeneous and heterogeneous. The purpose of this lab is to learn how to separate individual components from a mixture through decantation‚ filtration‚ distillation‚ and crystallization. Pre-Lab Questions: Attached
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dolerophanite‚ and claudetite. As minor phases‚ tenorite‚ arsenolite‚ delafossite and enargite were detected. In the sample studied‚ particles were mainly spherical and less than 60 μm. The leaching of flue dust sample with water dissolved copper sulfates and zinc sulfates and‚ partially‚ arsenic oxides‚ in an exothermic process. The leaching of the residue after water leaching in several acid media increased the dissolution of copper and arsenic oxides and small amounts of zinc. A preliminary study by hydrocyclone
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w w w e tr .X m eP e ap UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Ordinary Level .c rs om 5070/11 CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB recommended) October/November 2011 1 hour *0909424295* 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
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stirred with a pre-chilled stir bar while 19.77 grams of ammonium sulfate was added slowly for a 40% cut precipitation. The clarified homogenate was stirred for 15 minutes after the ammonium sulfate was dissolved. The clarified homogenate was centrifuged for 15 minutes at 15‚000 gx. The volume of the 40% cut supernatant was measured and the pellet was discarded. The 40% cut was stirred rapidly while 14.61 grams of ammonium sulfate was slowly added for a 65% cut precipitate and was stirred slowly
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pH In chemistry‚ pH is a measure of the acidity or basicity of an aqueous solution. Solutions with a pH less than 7 are said to be acidic and solutions with a pH greater than 7 are basic or alkaline. Pure water has a pH very close to 7. pH is defined as the decimal logarithm of the reciprocal of the hydrogen ion activity‚ aH+‚ in a solution. Universal indicator consists of a mixture of indicators such that there is a continuous color change from about pH 2 to pH 10. Universal indicator paper
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* Lithium sulfate Lithium sulfate would give off a pink flame when lit‚ making it easy to identify and relable against the other substances. * Potassium nitrate Also‚ potassium would give off a light purple color when lit‚ making it simple to identify against the other substances. * Ammonium chloride Ammonium‚ although not tested in this lab‚ would be easy to pick out since it most likely does not give off a pink or purple flame as lithium sulfate and potassium sulfate do‚ respectively
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Anthony Young Partner: Nick Dale TA: Alehkya 6/8/15 Isolation of Trimyristin from Nutmeg and Preparation of Myristic Acid from Trimyristin by Hydrolysis. Introduction In this experiment‚ trimyristin will be isolated from the nutmeg by extraction‚ and then used to prepare myristic acid by hydrolysis. The isolation of a substance from a natural product is a common technique used nowadays. Usually‚ the isolation is a complex procedure and requires a lot of steps and preparation. For this experiment
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the range of the uncertainty. Such modifications include the usage of different solution and salt bridges after conducting each trial. However‚ one strength of the experiment is the precise calculation and measurement of Copper Sulfate‚ Sodium Chloride‚ and Magnesium Sulfate‚ as well as the creation of the 0.5‚ 1.0‚ 1.5 molar solutions. The process of measuring the exact amount of salt and then ensuring of said salt to completely dissolve in water. As well as filling the graduated cylinder with the
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Write your name here Surname Other names Centre Number Candidate Number Edexcel IGCSE Chemistry Unit: 4CH0 Science (Double Award) 4SC0 Paper: 1C Wednesday 25 May 2011 – Morning Time: 2 hours Paper Reference 4CH0/1C 4SC0/1C You must have: Ruler Candidates may use a calculator. Total Marks Instructions black ink or • Usein the boxesball-point pen. page with your name‚ Fill at the top of this • centre number and candidate number. all • Answer
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interactions. In many cases of drugs‚ metabolism occurs in two phases. The phase (I) reactions normally involve the formation of a new functional group. The phase (II) reactions involve the conjugation with a substance that is endogenous such as an acid‚ sulfate. The reactions in phase (II) are synthetic in nature. Metabolites from synthetic reactions are readily excreted by the kidneys and liver organs. The rate of Metabolism increases with the drug concentration increase. There are two types of metabolism
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