------------------------------------------------- Liquid–liquid extraction From Wikipedia‚ the free encyclopedia Liquid–liquid extraction also known as solvent extraction and partitioning‚ is a method to separate compounds based on their relative solubilities in two different immiscible liquids‚ usually water and an organic solvent. It is an extraction of a substance from one liquid into another liquid phase. Liquid–liquid extraction is a basic technique in chemical laboratories‚ where it is performed
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Milk is a great blessing of nature. It is a complete food from the few months baby to the elder person. It provides the entire elements needed by a body for its development and growth such as protein‚ water‚ carbohydrates‚ minerals‚ fat and vitamins. It not only provides power but also enhances immunity to fight against many different types of pathogens. It is necessary for the growth of bones and for the blood clotting. It fulfills body’s calcium requirement. 100g of cow’s milk contains 3.9g fat
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IGCSE PRE-AICE CHEMISTRY 0620 OFFICIAL STUDY GUIDE Notes: To avoid any confusion concerning the symbol for litre‚ dm3 will be used in place of l or litre.Valence electrons are known as valency electrons for this test. Nature of Matter The states of matter are solid‚ liquid‚ and gas‚ in respective order of kinetic energy. State of Matter | Definite Volume | Definite Shape | Solid | Yes | Yes | Liquid | Yes | No | Gas | No | No | Diffusion:
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Mark Scheme (Results) Summer 2012 International GCSE Chemistry (4CH0) Paper 1C Science Double Award (4SC0) Paper 1C Edexcel Level 1/Level 2 Certificate Chemistry (KCH0) Paper 1C Science (Double Award) (KSC0) Paper 1C Edexcel and BTEC Qualifications Edexcel and BTEC qualifications come from Pearson‚ the world’s leading learning company. We provide a wide range of qualifications including academic‚ vocational‚ occupational and specific programmes for employers. For further information‚
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between the late 4th century BC and the early 5th century BC (Zhou dynasty). The process was created by melting pig iron. The blast furnace was used for smelting iron ore and coke (a high carbon fuel)‚ charcoal or anthracite (a type of coal). Limestone was used as a flux. Sand was used to create the castings. Innovators used this process to create tools‚ wheels‚ weapons and machinery. The iron plow‚ swords‚ spears and knives were developed around the 6th century BC (Han dynasty). Paper making
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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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CHEM RESEARCH TASK 1. INDICATORS Identify and describe some everyday uses of indicators including the testing of soil acidity/basicity. • Indicators are used regularly in chemical laboratories during chemical reactions. One important use is to determine the end point of a titration when an acid reacts with an alkali. The reactants and products of such a reaction are colourless so an indicator is a useful way to visually determine when the reaction is complete. Chemists also need to monitor
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OBJECTIVES At the end of the discussion‚ the students must be able to: • Discuss safety awareness for clinical laboratory personnel. • List the responsibilities of employer and employee in providing a safe workplace. • Identify hazards related to handling chemicals‚ biologic specimens‚ and radiologic materials. • Choose appropriate personal protective equipment when working in the clinical laboratory. • Identify the classes of fires and the type of fire extinguishers to use for each. • Describe steps
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CHEM131_S15_X1_Pract_Ans Montgomery College Takoma Park Silver Spring Campus CHEM1 31 – Spring 2015 Name: _____Answers_____. Exam I Multiple Choice Questions: (3 points each = 30 points) 1) A graduated cylinder is filled with 25.0 mL of water. A solid sample is dropped into the graduated cylinder and the 3 water rises to the 37.6 mL mark. What is the mass of the solid if its density is 2.81 g/cm ? A) 9.79 g B) 106 g C) 0.223 g D) 70.3 g E) 35.4 g ____________________________________________________________________________
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Mg2+(aq) + Cu(s) c No reaction. Iron cannot displace the more reactive zinc from solution. d Overall equation: Cu(s) + 2Ag+(aq) Cu2+(aq) + 2Ag(s) Review Exercise 9.2 1 a –2 b 0 c +4 d +6 e +6 f –2 2 a NH3‚ ammonium salts b N2 c N2O d NO e HNO2‚ N2O3‚ nitrites f HNO3‚ nitrates 4 a Cr2O72–(aq) + 8H+(aq) + 3SO32–(aq) 2Cr3+(aq) + 4H2O(l) + 3SO42–(aq) b Cu(s) + 2NO3–(aq) + 4H+(aq) Cu2+(aq) + 2NO2(g) + 2H2O(l) c 2MnO4–(aq) + 16H+(aq) + 10Br–(aq) 2Mn2+(aq) + 8H2O(l) + 5Br2(aq) 5 a 2MnO4–(aq)
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