Topic 6 Microscopic World II Unit 23 Shapes of molecules Unit 24 Bond polarity and intermolecular forces Key C o ncepts Microscopic World II Shapes of molecules • Covalent molecules with non-octet structures • Shapes of molecules • The VSEPR theory • Molecular crystals of buckminsterfullerene (C60) • Carbon nanotubes Bond polarity and intermolecular forces • Electronegativity and bond polarity • Van der Waals’ forces • Factors affecting the strength
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commercial aviation and the increasing use of plastic. More than 4000 years ago‚ according to Herodotus and Diodorus Siculus‚ asphalt was used in the construction of the walls and towers of Babylon; there were oil pits near Ardericca (near Babylon)‚ and a pitch spring on Zacynthus.[32] Great quantities of it were found on the banks of the river Issus‚ one of the tributaries of the Euphrates. Ancient Persian tablets indicate the medicinal and lighting uses of petroleum in the upper levels of their
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Ordinary Level CHEMISTRY Paper 1 Multiple Choice May/June 2005 1 hour Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) 5070/01 w w w e tr .X m eP e ap .c rs om READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Write your name‚ Centre number and candidate number on the answer
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The Use of Second Life in Business Abstract Second Life and other virtual worlds like it are quickly becoming one more in an arsenal of mainstream applications that business are using to gain an edge on their competitors. However‚ since virtual worlds are still in the infancy stage‚ the ways that companies can best use them to further their goals is still under development. This paper takes a look at how businesses are using virtual worlds in the areas of brand and service expansion‚ virtual human
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"My Journey from Sunset to Sunrise" When the sun sets‚ thousands of hues of purple‚ orange‚ pink‚ and yellow fill the heavens. They blend with the clouds and cast off a dreamy air. It is a time when the colors of the day meet the colors of the night. Deep purples of the coming nightfall mix ever so gently with the orange tingles of the day. This passing from day to night forms a period of pure magic‚ when one may no longer distinguish between where the day ends and the night sky begins. The
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THE COMPANY DALISAY SWEETS No. 18 Jesus St. Roosevelt SFDM Quezon City‚ Metro Manila‚ Philippines Business Numbers: (+632) 4129057 (+632) 3731617 Fax Number: (+632) 3740442 Description: Having its roots traced back to 1952; Dalisay Sweets is one of the leading food manufacturing companies in the industry today. Headquartered in Quezon City‚ Manila‚ Philippines; Dalisay Sweets manufactures and exports tropical fruit and vegetable
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Organometallic preparation and addition to carbonyls‚ Wittig reagent preparation and Wittig rxn‚ Wolff‚ H-based nucleophile carbonyl reduction‚ imine formation‚ reductive amination (rxn only)‚ ketal/acetal formation‚ dithiane chemistry (rxn only)‚ alpha-bromination of ketones‚ -COOH properties (the trends on HW4)‚ Fischer‚ acidic/basic hydrolysis of esters/amides/nitriles‚ CH2N2‚ acid chloride formation (rxn only)‚ acid chloride rxns with esters and amides. 2 Rxn of carboxyllic acid derivatives
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Top 10 life style diseases Alzheimer’s Disease: a form of brain disease. No one knows the exact cause‚ but a real breakdown of the cells of the brain does occur. There is no treatment‚ but good nutrition may slow the progress of this lifestyle disease‚ which lasts about seven years in most people who have it. Arteriosclerosis: A generic term for several diseases in which the arterial wall becomes thicken and loses elasticity. Atherosclerosis is the most common and serious vascular disease.
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Title: Daily Exercise. Topic: Exercise Habit. Thesis statement: Daily exercise causes life to improve. (Persuade) Type of essay: Cause and Effect. Technique: Dramatic Entrance. Effects: 1. Cardiovascular and pulmonary function. 2. Helps reduce the stress. 3. Improve of emotional fitness. Target: Young adults. Method: two By 2006‚ a study by the Centers for Disease Control and Prevention (CDC) found that 28.5 percent of Americans between the ages of 20 and 39 were obese
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Compare and Contrast: Lion and Tiger Lions and tigers are the top two ferocious animals in the big cat family. The lion is known as the “king of beast “and the tiger is known as the “emperor of beast”. Both lions and tigers have many things in common and at the same time they have a number of differences. Lions and tigers belong to the mammalian group and Felidae family. Lions lives in prides and tigers lives alone. They have no predators of their own and reside at the top of their food chain
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