Chapter 1 Carbon Compounds and Chemical Bonds. (Covered material: 1.1 - 1.8; 1.12 - 1.17) 1. Structural Theory – most fundamental theory of Organic Chemistry (developed independently by A. Kekule‚ A. Couper and A. Butlerov between 1858 and 1861). Organic Compounds – compounds of carbon and hydrogen. Other elements frequently found in organic compounds are: oxygen‚ nitrogen and halogens (F‚ Cl‚ Br‚ I); less frequently found are: sulfur and phosphorus. Review Periodic Table for determining valence
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close atoms can get Hydrogen bonding: * Dipole-Dipole attraction * Occurs between H atoms (positive charge) and highly electronegative atoms (negative charge) such as O‚ N‚ F * δ = lowercase delta (+/-) * hydrogen reacts with a lone pair * Transient bond (temporary) * H has a high boiling point * Ice has crystalline structure * Water molecule is bent: 107.5° angle * Adhesion: between molecules and surface * Cohesion: between molecule and molecule * Intermolecular:
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Evaluating Ranked Queries in Limited Time and Memory for Information Retrieval for Distributed Digital Libraries June Boltzis LILAC Centre‚ School of Library Studies Clyde College‚ Elgin‚ Australia Abstract Ranking techniques are used to evaluate natural-language queries on text databases. Text databases are an important component of digital libraries. Effective ranking can be costly in memory and time: the database may contain millions of documents and queries can contain large numbers of terms
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These sneaker bots allow people to cop anything from one to hundreds of pairs. Bots are a great way to get sneakers‚ however they require countless hours to perfect and cost hundreds of dollars. Beginners always fail with sneaker bots because they don’t understand the complexity of them. Bots require proxies which hide the ip
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chromosomes pair-up. Chromatids visible. a a A A GF 2007 A Diploid cell with Unlinked genes – Meiosis AB alleles on I different paternal chromosomes ab alleles on different maternal chromosomes B B b b Homologous chromosomes pair-up. Chromatids visible. Spindle forms a a A A GF 2007 A Diploid cell with Unlinked genes – Meiosis I AB alleles on different paternal chromosomes ab alleles on different maternal chromosomes B B b b Homologous chromosomes pair-up. Chromatids
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by the previous word or non-word. The null hypothesis stated that all pairs would have the same mean reaction time‚ regardless of whether the first string was a word or non-word. The alternative hypothesis stated that the mean reaction time for word-non-word pairs would be slower than non-word-word pairs‚ which would be equal to the mean reaction time for non-word-non-word pairs.
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Shell Electron Pair Repulsion) theory proposes that the geometric arrangement of terminal atoms‚ or groups of atoms about a central atom in a covalent compound‚ or charged ion‚ is determined solely by the repulsions between electron pairs present in the valence shell of the central atom. The number of electron pairs around the central atom can be determined by writing the Lewis structure for the molecule. The geometry of the molecule depends on the number of bonding groups (pairs of electrons) and
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BSG Quiz 2 Answers The highlighted red answers are the ones that are correct. The simplest way of navigating through this document is to press find and put down a very unique quote from the question on BSG. For example to find the answer for the question below would be the find the quote “companies can expect to sell”. Make sure it is 100% the same question and answers and you will do very well on this quiz. Some questions have similar wording and the question may be further down the document. Another
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just an abortive attempt” (Shabnum 1). This inability to free themselves from the shackles of their average day to day monotony makes for a repetitive and predictable play. This repetitiveness only furthers the idea that the pair will be waiting for Godot eternally. The pair seems to be drawn to Godot for one reason or another and cannot bring themselves to leave before they meet Godot. “As Vladimir and Estragon are already condemned to endless suffering in the form of ceaseless waiting‚ the spectator
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molecules. If you are interested in electronegativity in an organic chemistry context‚ you will find a link at the bottom of this page. What is electronegativity Definition Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. The Pauling scale is the most commonly used. Fluorine (the most electronegative element) is assigned a value of 4.0‚ and values range down to caesium and francium which are the least electronegative at 0.7. What happens if two atoms
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