PERFLUORINATED COMPOUNDS: PERSISTENT‚ PESKY POLLUTANTS PRESENCE IN ARCTIC ENVIRONMENT AND WILDLIFE‚ LEADING TO PRESENCE IN HUMAN BLOOD SERUM J. Horton CHEM 422- Environmental Chemistry 4th of May‚ 2012 1 I N TR O D U CTI O N Perflurorinated compounds (PFCs) are heterogeneous organic compounds that have a partially or fully fluorinated alkyl chain‚ which can range from four to fourteen carbons and can have other functional organic groups attached. PFCs are mostly the products of industrial
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GENERAL INSTRUCTIONS: A: The numerical are based on application of theory content. Attempt them in your physics notebook as practice assignment. B: Do all questions in sequence. UNIT –I: ELECTROSTATICS 1. Three identical charges each +q are placed at the corners of an equilateral triangle of side d cm. Calculate the force on a +ve charge +2q at the centroid of the triangle. 2. Force acting on a charged particle kept between the pair of plates‚ having equal and opposite charge‚ is F. If
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absolute zero - a theoretical condition concerning a system at zero Kelvin where asystem does not emit or absorb energy (all atoms are at rest) accuracy - how close a value is to the actual or true value; also see precision acid - a compound that‚ when dissolved in water‚ gives a pH of less than 7.0 or a compound that donates a hydrogen ion acid anhydride - a compound with two acyl groups bound to a single oxygen atom acid dissociation constant - an equilibrium constant for the dissociation of
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Mole Calculations Moles and Number 1 mole of any substance contains the same number of atoms/molecules/ions as there are atoms in a 12g sample of carbon -12 12g of carbon-12 contains a constant number of atoms. This number is known as the Avogadro constant (L) and is equal to 6.02 x 1023. 1 mole of carbon-12 contains 6.02 x 1023 atoms. Therefore‚ 1 mole of any substance contains 6.02 x 1023 atoms/molecules/ions. For example‚ 1 mole of aluminium contains 6.02 x 1023 Al atoms 1
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THE ITALIAN UNIVERSITIES’ INTERNATIONAL MEDICAL ADMISSIONS TEST (IMAT) TEST SPECIFICATION In partnership with Ministero dell’Istruzione‚ dell’Università e della Ricerca (MIUR) February 2013 Test Specification Test Format The IMAT will have the same structure as the existing Italian test. Candidates are allowed a total of 90 minutes to complete the test. Section 1 General Knowledge and Logical Reasoning (Critical Thinking and Problem Solving) 30 multiple-choice questions. Sections
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Probability From Wikipedia‚ the free encyclopedia Jump to: navigation‚ search Probability Outline Catalog of articles Probabilists Glossary Notation Journals Category v t e Certainty series Agnosticism Approximation Belief Certainty Doubt Determinism Epistemology Fallibilism Fatalism Hypothesis Justification Nihilism Probability Scientific theory Skepticism Solipsism Theory Truth Uncertainty v t e Probability (or likelihood[1])
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Cup o’ Noodles: Through the Eyes of a Chemist Background: Before completing this experiment‚ one must know about chemical formulas‚ ionic bonding‚ solutions and moles to understand the results of this experiment. A chemical formula is the symbol for compounds and elements. It tells chemists how many atoms are in a chemical compound‚ formula unit or molecular compound. In a chemical formula a subscript indicates how many atoms there are of an element before it. The coefficient in a chemical formula
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PRACTICE EXAMINATION QUESTIONS FOR 1.1 ATOMIC STRUCTURE (includes some questions from 1.4 Periodicity) 1. (a) Complete the following table. |Relative mass|Relative charge| Neutron||| Electron||| (2) (b) An atom has twice as many protons as‚ and four more neutrons than‚ an atom of 9Be. Deduce the symbol‚ including the mass number‚ of this atom. ..................................................................................................................................... (2) (Total
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CONCENTRATION AND DILUTION Physiology 1‚ Las Positas College Name: In science‚ concentration is a measure of the number of particles (solutes) in a given volume. If one room has 100 people in it‚ and a room of equal size has 50 people‚ one can say that the concentration of people in one room is twice that of the other. Quite simple‚ isn’t it? On a molecular level‚ consider whether you put one lump or two of sugar‚ or no sugar at all‚ in your coffee. If you use two lumps‚ you prefer twice
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Abstract Bipolar Disorder is a mental illness in which a person’s mood alternates between extreme mania and depression. Bipolar disorder is also called manic-depressive illness. In a related disorder called cyclothymic disorder (sometimes called Bipolar III)‚ a person’s mood alternates between mild depression and mild mania. Some people with cyclothymic disorder later develop full-blown bipolar disorder. Rates of bipolar disorder are similar throughout the world. At least fifteen percent of people
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