atmosphere by ________. A) nitrogen dioxide B) ozone C) iron D) AIDS E) ultraviolet light Answer: E 7) When a part of the body is injured‚ substances called ________. are released. A) aspirins B) pain relievers C) nitrogen oxides D) chlorofluorocarbons E) prostaglandins Answer: E 8) The production of smog from the chemical NO requires ________. A) nitrogen B) chlorine C) water D) oxygen E) CFCs Answer: D 9) When scientific information
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Nitrogen Family (The traditional name for the elements in Nitrogen’s column‚ the “pnictogens”‚ comes from a Greek word for “choking” or “strangling”) P.7 Nitrogen: Fritz Haber discovered how to convert the Nitrogen in the air into an industrial product. Although nitrogen gas can suffocate those who are unsuspecting‚ tends to be benign‚ almost to the point of uselessness. The one important thing it can do is replenish the soil; it is as important to plants as vitamin c is to us. When pitcher
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exploziei. The most commonly used oxidizers are nitrates‚ the major component of black powder. Nitrates are composed of nitrate ions (NO3-) with metal ions. The most common oxidizer is potassium nitrate‚ which decomposes to potassium oxide‚ nitrogen gas‚ and oxygen gas. Oxidantii utilizati cel mai frecvent sunt nitratii‚ componenta majora a pulberii negre. Nitratii sunt compusi din ioni nitrati (NO3-) cu ioni metalici. Oxidantul cel mai comun este azotatul de potasiu care se
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Q.1 Bond enthalpy of fluorine is lower than that of chlorine‚ why? Q.2 Give the IUPAC name of the following compound: (CH3)3-C-C-COOH ║ O Q.3 On increasing temperature‚ activation energy of a reaction decreases‚ why? Q 4 Which of the following is most effective electrolyte in the coagulative of AgI/Ag+sol? K2SO4‚ MgCl2‚ K4[Fe(CN)6] Q.5 Write the reaction when glucose is heated with excess of HI. Q.6 Which Xe compound has distorted octahedral shape? Q.7 What is the denticity of
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Mobile Phones Introduction: Mobile Phones were first created in 3rd April 1973 by a man named Martin Cooper‚ it is now 2013‚ and approximately 1 billion phones are being made and sold per year. Because of this‚ the demand for minerals to create mobile phones‚ is becoming more than ever. One of the main minerals used in creating mobile phones‚ is tin. Tin is generally used as the basic outside structure of a mobile phone. This essay will conduct of several topics‚ such as location of minerals‚ the
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Surname Centre No. Initial(s) Paper Reference 4 3 3 5 Candidate No. 2 H Signature Paper Reference(s) 4335/2H Examiner’s use only London Examinations IGCSE Team Leader’s use only Chemistry Paper 2H Higher Tier Tuesday 6 November 2007 – Morning Time: 2 hours Question Leave Number Blank 1 2 3 4 5 Materials required for examination Nil Items included with question papers Nil 6 7 8 9 Instructions to Candidates In the boxes above‚ write your centre number‚ candidate number‚ your surname
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Test 2 Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Find the combination that will give a gas as a product A. AgNO3(aq) + NaI(aq) B. HCl(aq) + Na2CO3 (aq) C. MgCl2(aq) + K2CO 3 (aq) D. CaSO4 (aq) + (NH4)3 PO4(aq) 1) A) A B) C C) B D) D 2) 2) The balanced molecular equation for complete neutralization of H2 SO4 by KOH in aqueous solution is __________. A) 2H+ (aq) + 2OH- (aq)
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Note Created By Jignesh.Parmar www.jiguparmar.com THE NEED FOR A CABLE TRAY SYSTEM: • • • As technology advances‚ so too does the need for effective support systems. Today‚ plants and buildings are moving more and more towards automation. Requiring complex system of wiring and cable laying. Old methods of cable management become obsolete under these demanding conditions. 1. Regular inspections must be carried out‚ & faults located 2. Many entry/exit points are required 3. New cables
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Unit 1- Lesson 2 Chemistry Key Questions 4. Name Formula Cobalt (II) Nitrate Co(NO3)2 Calcium Phosphate Ca 3 (PO 4) 2 Disphosphorus trioxide P203 Ammonium Sulfate (NH 4) 2 (SO 4) Gold (III) hydroxide AuH3O3 Platinum (II) Oxide PtO Gallium carbonate
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JOURNAL OF AIRCRAFT Vol. 44‚ No. 3‚ May–June 2007 Corrosion Pillowing in Aircraft Fuselage Lap Joints Nicholas C. Bellinger‚∗ Jerzy P. Komorowski‚† and Ronald W. Gould‡ National Research Council Canada‚ Institute for Aerospace Research‚ Ottawa‚ Ontario K1A 0R6‚ Canada DOI: 10.2514/1.18589 This paper presents the results of studies that have been carried out at the National Research Council Canada on the effect that corrosion pillowing has on the structural integrity of fuselage lap joints. Modeling
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