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