Preparation and properties of boric acid Result The mass of borax‚ g | 10.0734 | The mass of watch glass‚ g | 36.2842 | The mass of watch glass with product‚ g | 39.9803 | The mass of product‚ borix acid‚ g | 3.6961 | Test | Result | Boric acid is dissolved in water and methyl red indicator is added. | Pink solution is observed | Mannitol is dissolved in water and methyl red indicator is added. | Pink solution is observed | Both solution is added together | The colour of solution
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Save the ailing Earth from vehicular pollution Environmental pollution is one of the most serious problems facing humanity and other life forms on our planet today. Since the rise of the advancement of awkward prepositional phrasing technology‚ pollution had already started its harm as well; awkward phrasing from the dropping of the first atomic bomb‚ which results to land‚ water‚ and air pollution‚ to the industrialized world that pollutes the entire earth. People had been attempting to stop
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1. The diagram below shows the electronic structure of boron. (a) The electrons are represented by arrows. What property of the electrons do these ‘up’ and ‘down’ arrows represent? ..................................................................................................................................... (1) (b) Suggest why electrons which occupy the 2p sub-levels have a higher energy than electrons in the 2s sub-level. .....................................................
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420 PROCEEDINGS OF THE IEEE‚ VOL. 70‚ NO. 5‚ MAY 1982 Silicon as a Mechanical Material KURT E. PETERSEN‚ MEMBER‚ IEEE Abstract-Single-crystal silicon is being increasingly employed in a variety of new commercial products not because of its well-established electronic properties‚ but rather because of its excellent mechanical properties. In addition‚ recent trends in the engineering literature indicate a growing interest in the use of silicon as a mechanical material with the ultimate goal
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Koodankulam Nuclear Power Project Introduction: At present‚ India is the sixth largest energy consumer in the world and is projected to emerge as the fourth largest consumer after the United States‚ China and Japan in the coming decades. India’s commercial energy basket is currently dominated by coal (53 percent); oil (31 percent) and gas (8 percent). Meeting increasing energy demands will remain one of the major issues for India in the 21st century owing to high dependency on energy imports.
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and stalked you or watched everything you do? Freak out and run away‚ right? Same thing for the fish. So a pufferfish wouldn’t scare them because they’ve all probably seen a pufferfish at least once in their life. Also‚ since the material‚ wurtzite boron nitride‚ is the hardest known material on Earth‚ Puffy wouldn’t break easily‚ so the exoskeleton of Puffy would keep the parts inside of him
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charge carriers. – An applied voltage across pure Si wafer does not yield electron flow through the wafer. – A pure Si wafer is said to act as an insulator. • In order to make useful semiconductor devices‚ materials such as phosphorus (P) and boron (B) are added to Si to change Si’s conductivity. 4 valence electrons N-Type Silicon • Pentavalent impurities such as phosphorus‚ arsenic‚ antimony‚ and bismuth have 5 valence electrons. • When phosphorus impurity is added to Si‚ every
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Neodymium Iron Boron (NdFeB) are called Rare Earth because Neodymium and Samarium are found in the rare earth elements on the periodic table. Both Samarium Cobalt and Neodymium magnet alloys are powdered metals which are compacted in the presence of a strong magnetic field and are then sintered. • Neodymium Magnets (Rare Earth) (NdFeB) Neodymium a rare earth magnetis made up of Neodymium Iron and Boron and is moderate in price. With poor corrosion resistance neodymium iron boron magnet is usually
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Nuclear power plants provide the most economically efficient‚ safe‚ and sustainable source of power generation available to our generation; however it comes with it’s own set of issues that must be dealt with to mitigate any potential harm to the environment or population. One of the larger issues is that once the reactor has attained initial criticality‚ it is never truly “off”. The reactor will still produce heat due to decay of non-stable isotopes within it caused by fission. Because decay
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Isolated by Madame Curie: radium or rhenium? 18. Its crystals sublime as violet gas: iodine or bromine? 19. Holds its electrons less tightly: copper or gold? 20. One of the two densest metals: osmium or magnesium? 21. Used to disinfect water: boron or chlorine? 22. Compounds of this are used in toothpaste: lithium or fluorine? 23. Named after the inventor of dynamite: lawrencium or nobelium? 24. Has higher ionization energy: antimony or bismuth? 25. Is smaller in radius: scandium
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