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Sulfur Dioxide
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Properties
formula SO2 colourless gassoluble in
water melting point -72.7 °C boiling point -10 °C
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Structure
bent molecule sulfur atom has an
oxidation station of +4
bent - lomený
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Structure
sulfur atom is surrounded by 5 electron pairs
hypervalent molecule most of valence electrons
are engaged in S-O bonding.
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Natural Sources
oceans
volcanoes
forest fires
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Man – made Sources
fossil fuel combustion
smelting manufacture of sulphuric
acid conversion of wood pulp to
paper combustion – spalování
wood pulp – dřevní buničina
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Man – made Sources
production of elemental sulphur
coal burning oil burning
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Production and Reaction
S8 (l) + 8 O2 (g) → 8 SO2 (g)
Burning sulphur to give a blue flame
constituent - základní
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Production and Reaction
Cu (s) + 2 H2SO4 (aq) → CuSO4 (aq)
+ SO2 (g) + 2 H2O (l)
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Production and Reaction
SO2 (g) → SO2 (aq)
SO2 (aq) + H2O (l) → H2SO3 (aq)
demonstrate - ukázat
container - nádoba
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Production and Reaction
NaHSO3 (aq) + H2SO4 (aq)
→ NaHSO4 (aq) + H2O (l) + SO2 (g)
drip - nakapat
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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
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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
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Uses
Biochemical and biomedical roles
blocks nerve signals from the pulmonary stretch receptors
abolishes the Hering-Breuer inflation reflex
pulmonary – plícní
abolish - zrušit
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Health Impacts
can affect the respiratory system, the functions of the lungs
coughing, asthma and chronic
bronchitis
affect – postihnout
impact – dopad
prone - náchylný
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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
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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
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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
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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
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What We Should Do ???
If we’re cold, just wear more clothes
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What We Should Do ???
don‘t be lazy and use your own energy to do things like cycling, walking and running
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What We Should Do ???
find out more about renewable energy like solar power
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What We Should Do ???
find out more about renewable energy like hydroelectric power
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What We Should Do ???
find out more about renewable energy like wind power
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AND REMEMBER !!!
How you choose to use energy affects all life on Earth so think before you
act.
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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
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Thanks for your attention