The Boron Company Alyssa Sigua Period 6 February 18‚ 2014 Sources: www.chemicalelements.com www.chemicool.com http://periodiclanl.gov/default.htmn education.jlab.org Boron B Atomic Number: 5 Atomic Mass: 10.811 amu Origin of Name: From Borax and Carbon Name of Person/People who discovered Boron: Sir Humphry Davy and J.L GayLussac Date of Discovery: 1808 Common Uses: 1. Boron oxide (B O ) is used in glassmaking 2 3 and ceramics
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supply rice to the Japs and also let out his house to Jap as godown. Thongam Munal Singh saw him supplying food stuff to the enemy. M. Koireng Singh is the only English and Urdu speaking man at Moirang. He was employed by the Jap as interpreter. Amu mia brother of Quazi Wali Ulla‚ Darbar Member also brother of Naki Ahmad in his statement stated that Koireng Singh took him to Moirang bazaar to Naki Ahmad‚ who again introduced to Col. Malik. Since the Jap evacuated Moirang area these three men
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Helium Leak Detection Principles Helium Leak Detector vs Pressure Decay Leak Detection Faster The Helium Leak Detection Method utilizing a sniffer probe registers leaks with a response time of approximately one second. Dry The Helium Leak test method is totally dry. There is no soap bubble residue or water droplets to clean and dry after testing. The costs associated with cleaning supplies and drying equipment can be eliminated‚ along with the mess and unpleasantness of running a bubble
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Properties and applications of Materials Assignment 2 Task 1 (P1) I. Describe the structure including the atomic structure of the element copper. Copper has a symbol Cu. It is a metal with a very high thermal and electrical conductivity. Pure copper is soft and malleable when it is freshly exposed the surface has a reddish-orange colour. It has an atomic mass of 63.546 g.mol -1 and an atomic number of 29. The electrons per energy level for copper go 2‚8‚18‚1. Copper has an atomic number of 29‚ thus
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the number of protons and the number of neutrons make up the atomic mass of an element‚ but not the electrons? We generally do not use the number of electrons when calculating the atomic mass of an atom because they weigh so little (precisely 1/1836 AMU)‚ and only in precise calculations are the masses of the electrons included in atomic mass. 2. What was the difference between Mendeleev’s table and Mosley’s new arrangement? Mendeleev arranged the 63 elements know at his time in order of increasing
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Chapter 1: Measurements (20) 1) The measurement 0.000 004 3 m‚ expressed correctly using scientific notation‚ is A) 4.3 x 10-7 m. B) 4.3 x 10-6 m. C) 4.3 x 106 m. D) 0.43 x 10-5 m. E) 4.3 m. Answer: B 2) Which of the following measurements has three significant figures? A) 0.005 m B) 510 m C) 0.510 m D) 0.051 m E) 5100 m Answer: C 3) Which of the following numbers contains the
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constant maintains its constancy only at the specific temperature. How much energy is lost or gained when a mole of cobalt-60 undergoes beta decay: 6027Co --> 6028Ni + 0-1e ? The mass of the 6027Co atom is 59.933819 amu‚ and that of a 6028Ni atom is 59.930788 amu. Answer Here? 2.724x1011 J energy is released. 2.724x1011 J energy is absorbed. 2.724x108 J energy is released.
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composed of anions (-) and cations (+) surrounded by a fixed number of water molecules‚ called water of crystallization. The hydrate decomposes upon heating and produces an anhydrous salt. After finding the formula mass of the hydrate by adding the amu ‚ we can calculate the percent of water in the hydrated salt by comparing the mass of the water of crystallization to the mass of the hydrate salt. This is known as the theoretical percentage. The experimental percentage of water in a hydrate is found
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