SL & HL Questions on Environmental impactglobal warming 1. The table below lists
ID: 1033449 • Letter: S
Question
SL & HL Questions on Environmental impactglobal warming 1. The table below lists the current tropospheric concentration and global warming potential for some common greenhouse gases. Greenhouse gas Carbon dioxide Methane Nitrous oxide CFC-12 Sulfur hexafluoride SF6 Formula CO2 CH4 N2O CCI2F2 Concentration 388500 1870 323 534 0.007 GWP 25 298 10900 22800 Current tropospheric concentration in parts per billion. 2 Global warming potential (GWP) indicates the warming effect of a greenhouse gas relative to carbon dioxide over a period of 100 years. Source: Blasing, T.J. ad K. Smith 2011. "Recent Greenhouse Gas Concentrations." In Trends: A Compendium of Data on Global Change. Carbon Dioxide Information Analysis Centre, Oak Ridge National Laboratory, US Department of Energy, Oak Ridge, TN, USA. (a) State one other gas found in the atmosphere that also contributes to global warming. (b) In 1750 the tropospheric concentrations of carbon dioxide and methane were 280000 and 700 ppb respectively. Explain why both have increased significantly since then. (c)Explain why the tropospheric concentrations of CFC-12 and sulfur hexafluoride were both zero ppb in 1750 (d) Suggest why there are restrictions on the manufacture and use of sulphur hexafluoride even though its overall contribution to global warming is estimated to be less than 0.2%.Explanation / Answer
a. Water vapor
b.
After 1750, Industrialization started and the population of the industries, vehicles , electronic equipments are increased. Then the emission of green house gases are also increases. Defforestation in the name of modernization and development is also another factor which leads to the high production of carbon dioxide and affected the chemical equilibrium between the carbon dioxide and oxygen in nature.
c.
CFC or chlorofluorocarbon emission mainly started in 1930, because the major source of CFC s are cooling instruments like air-conditioning, refrigeration, blowing agents in foams, insulations and packing materials, propellants in aerosol cans, and as solvents. Like SF6 or sulfur hexa fluride used extensively in equipment for the transmission and distribution of electricity. So their concentrations were very law 1750.
d.
The manufacturing process is an exothermic reaction process with the liberation of energy by reacting Sulfur and Florine.
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