Transcript acid rain.

Form Group 3G
4th December 2006
What do you know about acid rain?
Starter Activity
Acid Rain attacks rocks such as chalk, ____marble____
and limestone. This is called _____weathering_____.
Acid Rain is formed by___gases___ such as
_sulphur_ _dioxide_ and oxides of ___nitrogen__
joining with water in the atmosphere. The gases that
form acid rain come from___industry___ and
___car__ __fumes___. Acid Rain
damages___trees___ and__plants____. It also
pollutes water killing___fish___.
What is acid rain?
• Normal rainwater has a pH of about
5.6, which means it is naturally slightly
acidic.
• This natural acidity is due to carbon
dioxide which dissolves in rainwater
and forms carbonic acid, a weak acid.
Rainwater with a lower pH than
normal is called acid rain.
How acid rain forms?
S+02
S02
2S02+02
2S03
S03+H20
H2S04
Volcanoes
Burning coal
How acid rain forms?
N+ ½ O2
NO
2NO + O2
2NO2
NO2 + H20
HNO3
Effects of Acid Rain
• Acid rain can increase the
acidity of lakes, dams and
streams and cause the death
of aquatic life.
•
Acid rain can increase the
acidity of soil, water and
shallow groundwater.
• Acid rain can dammage
forests.
• Acid rain erodes buildings and
monuments.
• Acid particles in the air are
suspected of contributing to
respiratory problems in people.
Effects of Acid Rain
Burning Fossil Fuels
Greenhouse Effect
Water vapour, carbon
dioxide, methane and
nitrous oxides.
Example