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Sulfur Dioxide

Sulfur Dioxide. Properties. formula SO 2 colourless gassoluble in water melting point -72.7 °C boiling point -10 °C. Structure. bent molecule s ulfur atom has an oxidation stat ion of +4. bent - lomený. Structure. sulfur atom is surrounded by 5 electron pairs

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Sulfur Dioxide

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  1. Sulfur Dioxide

  2. Properties • formula SO2 • colourless gassoluble in water • melting point -72.7 °C • boiling point -10 °C

  3. Structure • bent molecule • sulfur atom has an oxidation station of +4 • bent - lomený

  4. Structure • sulfur atom is surrounded by 5 electron pairs hypervalent molecule • most of valence electrons are engaged in S-O bonding.

  5. Natural Sources • oceans • volcanoes • forest fires

  6. Man – made Sources • fossil fuel combustion • smelting • manufacture of sulphuric acid • conversion of wood pulp to paper • combustion – spalování • wood pulp – dřevní buničina

  7. Man – made Sources • production of elemental sulphur • coal burning • oil burning

  8. Production and Reaction S8 (l) + 8 O2 (g) → 8 SO2 (g) Burning sulphur to give a blue flame • constituent - základní

  9. Production and Reaction Cu (s) + 2 H2SO4 (aq) → CuSO4 (aq) + SO2 (g) + 2 H2O (l)

  10. Production and Reaction SO2 (g) → SO2 (aq) SO2 (aq) + H2O (l) → H2SO3 (aq) • demonstrate - ukázat • container - nádoba

  11. Production and Reaction NaHSO3 (aq) + H2SO4 (aq) → NaHSO4 (aq) + H2O (l) + SO2 (g) • drip - nakapat

  12. Uses As a preservative • for dried apricots and other dried fruits • to maintain their appearance • to prevent their rotting • apricot - meruňka • appearance - vzhled • rotting - hnití

  13. Uses In winemaking • as an antibiotic and antioxidant to protect wine from spoilage by bacteria and oxidation • to keep volatile acidity • in winery sanitation • spoilage – zkažení • winery sanitation – hygiena vinice

  14. Uses Biochemical and biomedical roles • blocks nerve signals from the pulmonary stretch receptors • abolishes the Hering-Breuer inflation reflex • pulmonary – plícní • abolish - zrušit

  15. Health Impacts • can affect the respiratory system, the functions of the lungs coughing, asthma and chronic bronchitis • affect – postihnout • impact – dopad • prone - náchylný

  16. Environmental Impacts Acid rain • damages trees, crops, historic buildings and monuments • makes soils, lakes and streams acidic • is a term used to describe all forms of acid precipitation (rain, snow, hail, fog, etc.) • crop – úroda • hail - krupobití • soil – půda • precipitation - srážka

  17. Environmental Impacts • precipitation is naturally acidic because of carbon dioxide in the atmosphere. The burning of fossil fuels (coal, oil and gas) produces sulphur dioxide and nitrogen oxides which can increase the acidity of rain or other precipitation

  18. Environmental Impacts • the increasing demand for electricity and the rise in the number of motor vehicles in recent decades has meant that emissions of acidifying pollutants have increased dramatically from human sources, particularly since the 1950‘s • demand – požadavek • pollutant – znečisťující látka

  19. What We Should Do ??? • to reduce our dependence on fossil fuels and energy consumption • not driving around, flying and having the heating or air conditioning turned up so high • dependence - závislost • consumption - spotřeba

  20. What We Should Do ??? If we’re cold, just wear more clothes

  21. What We Should Do ??? • don‘t be lazy and use your own energy to do things like cycling, walking and running

  22. What We Should Do ??? • find out more about renewable energy like solar power

  23. What We Should Do ??? • find out more about renewable energy like hydroelectric power

  24. What We Should Do ??? • find out more about renewable energy like wind power

  25. AND REMEMBER !!! How you choose to use energy affects all life on Earth so think before you act.

  26. Sources of Information • http://en.wikipedia.org/wiki/Sulfur_dioxide • http://www.epa.gov/air/urbanair/so2/ • http://so2.umbc.edu/omi/ • http://www.chm.bris.ac.uk/motm/so2/ so2h.htm • http://mattson.creighton.edu/SO2/ SO2_Info.html

  27. Thanks for your attention

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