Environmental effects.

1.CFCs and substitutes and the oz iodine hole. The environmental effects of CFCs and their substitutes a.CFCs - highly stable molecules, life-time in the atmosphere of between 50 and 100 years; determine 2 or 3 chlorine atoms. b.CFCs substitutes ( transitional compounds) i.HCFCs - one or more of the chlorine atoms has been replaced by henry atoms, lifespan in the atmosphere about 20 years, support a tenth or twentieth of the potential distress of the CFCs. ii.HFCs - all(prenominal) the chlorine is replaced by hydrogen - not damaging to ozone - life history in the atmosphere about 20 years. c.All of these three families of compounds argon also very potent greenho expenditure gases. d.Some hydrocarbons - propane and isobutene - atomic number 18 dead on target increasingly use upd as a greener alternative to some(prenominal) the CFCs and their transitional replacement. The hole in the ozone layer a.The stratosphere - 10 to 50 km above the Earths surface - contains ozone w hich absorbs some of the more dangerous forms of solar radiation [UV radiation and X-Rays]. b. The thickness of the ozone layer can palpitate by several percentages every day. c.The ozone layer is affected by halogenated substances, such as chlorine (Cl), fluorine (Fl) and bromine (Br) compounds. d.Production and use of these substances is being reduced substantially under the Montreal Protocol. e.Deterioration of the ozone layer is typically a global problem. 2.

Air pollution and what are the main(prenominal) pollutions In burn process the following is involved: §Re starts are consumed. §Useful service ar e provided. §Waste gases are produced. Here! are the main melody pollutants that arise from fossil fuel burning, along with some of their unwrap effects on human health. oSulphur dioxide (SO2) - causes dot rain - solution; power displace and other large combustion plants. oNitrogen oxides (NOx) - causes acid rain - source; Transport. oParticulates (black... If you want to get a integral essay, order it on our website: BestEssayCheap.com

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