Chemical bond From Wikipedia‚ the free encyclopedia Jump to: navigation‚ search A chemical bond is an attraction between atoms that allows the formation of chemical substances that contain two or more atoms. The bond is caused by the electrostatic force of attraction between opposite charges‚ either between electrons and nuclei‚ or as the result of a dipole attraction. The strength of chemical bonds varies considerably; there are "strong bonds" such as covalent or ionic bonds and "weak bonds"
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between ions is strong/ ionic bond/PbBr2 has strong electrostatic attraction. ∴ it has higher a m.p. (Do NOT accept lead(II) bromide is an ionic compound/ ionic structure) 1 1 (ii) Lead is a metal/ The bonding between lead atoms in solid is metallic bond. There exists mobile/ delocalized (freely-moving) electrons in lead ∴ it conducts electricity. In solid lead(II) bromide‚ the ions are not mobile ∴ it does not conduct electricity 1 1 (iii) Yes‚ when molten/ in liquid state‚ the Pb2+ and
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Corrosion Cell Electrolyte Fe++ H0 H0 Conventional Current Flow H0 H0 H0 2eAnode Electron Current Flow Metallic Path Cathode _____________________________CORRTECH The Corrosion Damage Begins Rust expands volume 5-10x’s Internal stress + 5‚000 psi Electron Migration (e-) _____________________________CORRTECH Corrosion Cell Elements • • • • Anode Cathode Metallic path Electrolyte Eliminate
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Interests in Property The goal of this paper is to establish whether Pamela has priority over the two mortgagees on the proceeds of the sale of the property in Dunroamin. It is also to establish if Pamela and Jack have a right over the items removed from the property they had purchased from Ahmed that were present during the purchase of the house. Finally‚ the paper is to determine whether Pamela can claim a right over the metal object that she picked at the garage. This paper will make use of case
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Identification of Metallic Ions Peter Jeschofnig‚ Ph.D. Version 42-0160-00-01 Kellie Long Purpose: To observe the different flames of alkali and alkaline metals. Procedure: Place a little bit of each element into the well plate. Then you soak a tip of a cotton swab in each solution. Then you place the cotton swab over the Bunsen burner until the flame changes color. observations The color of the flame is expected to be as follows: Metallic ion Flame color
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breathing. Even the police at the end of the story aren’t living- Leonard is confronted by a police car‚ which arrests him without a living person inside. Bradbury’s word choice creates a cold‚ unfriendly atmosphere‚ describing the car’s voice as “metallic” (2)‚ “iron” (4)‚ and even as “the phonograph voice” (3). The people in this society are so inanimate that they don’t even need the police to monitor them; in fact‚ only one police car remains in the population of three million. Because Bradbury
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His M16 with a fully loaded magazine is within your reach; grab the weapon’s cold‚ metallic‚ handle getting ready to spring up‚ aim down the sight and kill the first enemy you spot. You get up and start shooting like a rookie in training‚ spraying bullets everywhere. While you are shooting this gun you notice the spent bullet casings ejecting out of the chamber and landing on the ground next to you. The soft metallic clinging sound and the smell of gunpowder overpowers your nose‚ distracting you from
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www.steelwirechina.com BRITISH STANDARD BS EN 10244-1:2009 Steel wire and wire products — Nonferrous metallic coatings on steel wire Part 1: General principles ICS 25.220.40; 77.140.65 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW www.steelwirechina.com BS EN 10244-1:2009 National foreword This British Standard is the UK implementation of EN 10244-1:2009. It supersedes BS EN 10244-1:2001 which is withdrawn. The UK participation in its preparation
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textiles‚ which are all intriguing to me. As a fashion designer‚ I was very interested in the textures and patterns incorporated into these recycled fabric. Some of the recycled materials turned into art that stood out to me were Textile and Table Mat (Metallic Patched). Textile is designed by Reiko Sudo and was made in 2008. It is a fabric made out of dobby-woven
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Oxygen Oxygen and its compounds play a key role in many of the important processes of life and industry. Oxygen in the biosphere is essential in the processes of respiration and metabolism‚ the means by which animals derive the energy needed to sustain life. Furthermore‚ oxygen is the most abundant element at the surface of the Earth. In combined form it is found in ores‚ earths‚ rocks‚ and gemstones‚ as well as in all living organisms. Oxygen is a gaseous chemical element in Group VA of the periodic
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