Environmental effects.

1.CFCs and substitutes and the oz iodine hole. The environmental effect of CFCs and their substitutes a.CFCs - highly stable molecules, life history in the standard atmosphere of in the midst of 50 and 100 historic period; determine 2 or 3 chlorine atoms. b.CFCs substitutes ( transitional compounds) i.HCFCs - one or to a greater extent of the chlorine atoms has been replaced by atomic number 1 atoms, lifespan in the atmosphere about(predicate) 20 years, require a tenth or twentieth of the heftyial equipment casualty of the CFCs. ii.HFCs - all(prenominal) the chlorine is replaced by hydrogen - not damaging to ozone - life in the atmosphere about 20 years. c.All of these three families of compounds atomic number 18 also very potent greenho expenditure gases. d.Some hydrocarbons - propane and isobutene - be bang-up increasingly used as a greener alternative to some(prenominal) the CFCs and their transitional replacement. The hole in the ozone degree a.The stratosphere - 10 to 50 km higher up the Earths surface - contains ozone which absorbs some of the more than dangerous forms of solar ray [UV radiation and X-Rays]. b. The thickness of the ozone stage can quiver by several percentages every day. c.The ozone layer is affected by halogenated substances, such(prenominal) as chlorine (Cl), degree Fahrenheit (Fl) and bromine (Br) compounds. d.Production and use of these substances is beingness reduced substantially chthonian the Montreal Protocol. e.Deterioration of the ozone layer is typically a global problem. 2.

Air pollution and what are the main pollutions In burn action the following is involved: §Re starts are consumed. §Useful assistant are provided. §Waste gases are produced. Here are the main cable pollutants that arise from fossil kindle burning, along with some of their divulge effects on benignant health. oSulphur dioxide (SO2) - causes dot rain - parentage; power stations and separate large combustion plants. oNitrogen oxides (NOx) - causes red-hot rain - source; Transport. oParticulates (black... If you postulate to get a integral essay, order it on our website: Orderessay

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