12 The Effects of Air Pollutants on Vegetation and the Role of Vegetation in Reducing Atmospheric Pollution Iuliana Florentina Gheorghe1 and Barbu Ion2 1Ecological University of Bucharest‚ Faculty of Ecology and Environmental Protection 2Forest Research and Management Institute Romania 1. Introduction The main air pollutants are represented by gases forms‚ particles in suspension‚ different ionizing radiation and noise. The gases forms are: oxidized and reduced forms of carbon (CO2‚ CO‚ CH4)‚ of
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The depletion of the ozone layer is a major concern today. The ozone layer protects us from the harmful rays of the sun; therefore it is imperative that we preserve it. Since more pollutants are produced today than ever before (because of the major increase in the population)‚ there is a major concern that we create less pollutants to help conserve the ozone layer. In this research paper I will give vital information on how pollution affects the ozone layer and methods instituted to help the ozone
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ozone layer is depleting. Ozone depletion occurs when the natural balance between the production and destruction of stratospheric ozone is tipped in favour of destruction. Although natural phenomena can cause temporary ozone loss‚ chlorine and bromine released from man-made compounds such as chlorofluorocarbons‚ called CFCs are now accepted as the main cause of this depletion. These are used as propellants in spray cans and in the making of plastic foam. They are also found in cleaning solvents
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1. Predict the molecular formula of an alkane with 13 carbon atoms. .................................................................................................................................. [Total 1 mark] 2. Bromobutane‚ CH3CH2CH2CH2Br‚ can be reacted with hot aqueous sodium hydroxide to prepare butan-1-ol. CH3CH2CH2CH2Br + OH– → CH3CH2CH2CH2OH + Br– A student reacted 8.72 g of bromobutane with an excess of OH–. The student produced 4.28 g of butan-1-ol. (i) Calculate the amount
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NH4Cl M= 53.50 g/mol 3.75 x 1024 atoms H x 1 molecule x 1 mol x 53.50 g = 83.3g 4 atoms H 6.02 x 1023 molec 1 mol How many molecules in a) 7.56 g of bromine gas. 7.56 g x 1 mol x 6.02 x 1023 molecules = 2.85 x 1022 molecules 159.80 g 1 mol b) 88.55g of carbon monoxide gas. 88.55 g x 1 mol x 6.02 x1023 molecules = 1.90 x
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Title: Synthesis and Reaction of halogenoalkane‚ 1-bromobutane Aim: To prepare 1-bromobutane and investigate some of its reactions Materials and Apparatus: • Eye protection • Distillation Kit • Thermometer • Measuring cylinder • Teat pipette • Rack with 3 small test tubes • Beaker Chemicals: • Butan-1-ol (harmful and flammable) • Sodium bromide • Concentrated sulphuric acid (very corrosive) • Anhydrous sodium sulphate • Concentrated hydrochloric acid (corrosive) • Ethanol
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22-2-96 CONDUCTING POLYMERS By Colin Pratt INTRODUCTION Until about 30 years ago all carbon based polymers were rigidly regarded as insulators. The idea that plastics could be made to conduct electricity would have been considered to be absurd. Indeed‚ plastics have been extensively used by the electronics industry because of this very property. They were utilized as inactive packaging and insulating material. This very narrow perspective is rapidly changing as a new class of polymer known
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Honors Chemistry Chapter Nine PracticeExam Student: ___________________________________________________________________________ 1. Which of these compounds is most likely to be ionic? A. KF B. CCl4 C. CS2 D. CO2 E. ICl 2. Which of these compounds is most likely to be ionic? A. NCl3 B. BaCl2 C. CO D. SO2 E. SF4 3. Which of these compounds is most likely to be covalent? A. Rb2S B. SrCl2 C. CS2 D. CaO E. MgI2 4. Which of these compounds is most likely to be covalent?
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other or if a pattern is represented in the arrangement of the elements. A number of scientists tried different kinds of patterns. For example‚ the German scientist Johann Wolfgang Döbereiner tried grouping the three halogens elements (chlorine‚ bromine‚ and iodine) in a consecutive order of atomic weights. The idea of putting the elements together finally took shape when the two scientists‚ Dmitry Mendeleev and Julius Lothar Meyer successfully arranged the order of the elements by their atomic weight
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Abstract Gold‚ silver‚ copper‚ lead‚ and mercury are some of the ancient elements. Hennig Brand discovered phosphorus the first element. After the discovery of phosphorus‚ many more elements were discovered. Johann Dobereiner discovered that elements could be grouped in three sets and proposed the Law of Triads. Later‚ A.E.Beguyer de Chancourtois arranged the elements according to their atomic mass and created the first geometrical representation of the periodic table. John Newlands proposed the
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