iron: * second most abundant metal (5% by mass) in Earth’s crust (fourth most abundant element) * found in rock (a mixture of minerals) as one or more minerals (usually a compound) * if a mineral is of economic importance‚ it is referred to as an ore * iron containing minerals include hematite (Fe2O3)‚ magnetite (FeO·Fe2O3 or Fe3O4)‚ limonite (FeO(OH)·nH2O) and siderite (FeCO3) Alloys: * homogeneous mixtures of metals or metals and non-metals * examples include brass (65%
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Correspondence to Dr Gary A Giovino‚ Department of Community Health and Health Behavior‚ School of Public Health and Health Professions‚ University at Buffalo‚ The State University of New York‚ 311 Kimball Tower‚ 3435 Main Street‚ Buffalo‚ New York 14214-8028‚ USA; ggiovino@buffalo.edu Received 24 May 2013 Accepted 8 August 2013 Published Online First 30 August 2013 e International Agency for Research on Cancer (IARC) currently lists 44 individual chemical agents‚ 12 groups or
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wonderful mineral and the mineral is an insulator for heat and electricity and on account of these reasons‚ mica is used in the electrical industry in a significant proportion. Bauxite: Bauxite is the main sources of aluminum and it is called a wonder metal because of the wide variety of its applications in many industries including aircraft industry. Bauxite deposits are found in many countries in the world. Gypsum: It is a mineral of great economic importance and it is used as a raw material in fertilizer
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rings. The following are 5 reasons why tungsten rings are worth your penny. 1. Tungsten rings are very durable If you are seeking for a durable jewelry that can stand the test of time‚ then tungsten rings are the right choice for you. Tungsten‚ the metal used to make the jewelry is made of is one of the strongest minerals on Earth. In fact‚ it can only be cut or broken by diamonds‚
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that flows through their property before emptying into a local sewer. The Benettis want your company to identify the compound in the liquid. Earlier work indicates that it is a dissolved metal compound. Many metals‚ such as lead‚ have been determined to be hazardous to our health. Many compounds of these metals are often soluble in water and therefore easily absorbed into the body. Electrons in atoms jump from their ground state to excited states by absorbing energy. Eventually‚ these electrons
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because of its uses in medicine‚ industry‚ and agriculture(Shriver). Sodium was discovered in 1807 by a man named Sir Humphrey Davy. He was well known for his discoveries of most alkali metals and Alkaline Earth Metals‚ such as potassium‚ magnesium‚ and many more(Chemicool Periodic Table).Sodium is from the alkali metal family. There are five more chemical elements from the same exact family. The period number of sodium is three. Na is the chemical symbol of sodium on the periodic table. Na is the symbol
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granular or pasty materials must be classified as Division 4.1 when the time of burning of one or more of the test runs‚ per the UN Manual of Tests and Criteria‚ is less than 45 seconds or the rate of burn is more than 2.2 mm/sec. Powders of metals or metal alloys are classified as Division 4.1 when they can be ignited and the reaction spreads over the whole length of the sample in ≤ 10 minutes. Division 4.2 – Spontaneously Combustible include the following categories: • Pyrophoric materials – liquids
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minerals. Gold- soft‚ lustrous yellow‚ malleable metal. It is one of the transition metals. It is highly sought after precious metal in jewelry Copper- is valued for strength‚ malleability‚ ductility‚ and ability to conduct electricity and heat. It is also non-magnetic‚ resists wear‚ and forms a green patina which makes it resistant to corrosion. Chromite-is the most important ore of chromium from which it derives its name. Chromium is an important metal and has a wide range of industrial uses. Chromite
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Osborne Reynolds Demonstration Sayed abbas Mohamed 20104762 03 1. Objective: To reproduce the classical experiments conducted by Professor Osborne Reynolds concerning fluid flow condition. 2. Theory: Reynolds number‚ Re is the internationally recognized criterion denoting fluid flow condition. “ Re = 4Q/ πvd ” Osborn Reynolds determined that values of Re could be assigned to define the transition from laminar to turbulent flow. 3. Apparatus: -Osborne Reynolds apparatus
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europium? 14. Has one valence electron: calcium or potassium? 15. Doesn’t react with sodium: chlorine or xenon? 16. A metal used in jewelry: sodium or rhodium? 17. 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
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