twig. (“It’s Elemental”) In an article I read by the Center of Disease Control‚ the domestic production of thallium ended in 1981‚ but in the past it had been produced from the residuals from the smelting of zinc‚ copper‚ and lead ores through electrolysis‚ precipitation‚ and reduction. Nowadays it is procured from reserves or is imported from countries such as Belgium‚ the Netherlands‚ Germany‚ and the United Kingdom. (“Toxicological Profile for Thallium”) Up until 2005 there had been no discovery
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Davy in London. Gay-Lussac & Thénard reacted boric acid with magnesium or sodium to yield boron‚ a gray solid. (1) They believed it shared characteristics with sulfur and phosphorus and named it bore. (2) Davy first tried to produce boron by electrolysis of boric acid‚ but was not satisfied with the results. He enjoyed greater success reacting boric acid with potassium in a hydrogen atmosphere. The result was a powdery substance. Davy commented the substance was‚ “of the darkest shades of olive
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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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.C. is committed to supporting business and investing and has developed numerous valuable resources for business owners and investors at various stages in their endeavours. Learn about these resources and how you can make the most out of your opportunities. Business Management Thinking of starting a business but not sure where to stThe Ksp expression is A. Ksp = Sr2+ [ ]3 PO4 3− [ ]2 B. Ksp = 3Sr2+ [ ] 2PO4 3− [ ] C. Ksp = 3Sr2+ [ ]3 2PO4 3− [ ]2 D. Ksp = 3Sr2+ [ ]3 2PO4
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Matter‚ Solutions‚ and Phase Changes Unit 1. What is matter? Anything that takes up space (volume) and has mass 2. Explain how to classify matter. (Homogeneous‚ Heterogeneous‚ Mixture‚ Pure Substance)? HOMOGENEOUS Matter that is made up of the same or alike particles Can’t see what makes it up Looks uniform HETEROGENEOUS Matter that is made up of different types of particles Can see what makes it up Mixture A material made up of two or more substances that can be easily separated
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Eating disorders: Bulimia nervosa and anorexia nervosa Eating disorders are the new diseases that emerge in the last 20 years. People who have eating disorders often have an abnormal eating habit that affects their physical and mental health. Eating disorders attacks female more frequently. And most of the sufferers are between 12 to 25 years old. In general‚ people who are clever‚ charming‚ conscientious‚ and hardworking are more likely to develop eating disorders. Many factors can lead to eating
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NaCl is 58.443 g/mol. Sodium chloride has a melting point of 801oC and its boiling point is 1‚465oC. Its vapor pressure is at 865oC is 1mm Hg. Sodium chloride’s solubility is 35.9g/100g water at 25oC. Salt does not undergo combustion. However‚ the electrolysis of molten sodium chloride will form chlorine gas and metallic sodium. Also‚ the aqueous solution of sodium chloride will react with aqueous silver nitrate to produce silver chloride. When salt reacts with an acid‚ there would be a double displacement;
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Famous Scientists’ List Name | Birth/Death | Achievements | Albert Einstein | 1879 - 1955 | He is arguably at the pinnacle‚ if the popularity of all the scientists is taken into account. He demonstrated solutions to a trio of mind-boggling topics in Physics in 1905 and shot into the limelight. | Sir Isaac Newton | 1642 - 1727 | "Philosophiae naturalis principia mathematica" called "Principia" is acknowledged as the greatest scientific book ever published. Sir Isaac Newton wrote this in 1687
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great radiation shield‚ due to the similar size of hydrogen and the protons and neutrons from radiation. Hydrogen can be extracted from the water ice found in the north and south poles on Mars. The element would be extracted through the process of electrolysis‚ where an electric current causes the compound to go through chemical decomposition. The living corridors on Mars could have walls containing hydrogen on the interior. The walls could also contain water in the interior due to the human need for
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A transformer is a static machine used for transforming power from one circuit to another without changing frequency. This is very basic definition of transformer. History of Transformer The History of transformer commenced in the year of 1880. In the year of 1950 400KV electrical power transformer first introduced in high voltage electrical power system. In the early 1970s unit rating as large as 1100MVA were produced and 800KV and even higher KV class transformers were manufactured in year
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