Chemical weathering is caused by rainwater reacting with rock minerals to form new minerals and soluble salts. These chemical reactions, including oxidation, hydrolysis, and solution (carbonation), occur most rapidly in warm, damp climates and are the first stage in soil production. The document then provides details on specific chemical weathering processes like oxidation, hydrolysis, solution, and carbonation.

1. PRESENTATION:
CHEMICAL
WEATHERING.
SUBMITTED BY.
SALAH UDDIN.
SUMMITTED TO:
DR.ZAHIR MUHAMMAD.
EXAM No.139

2. Chemicalweathering.
Chemical weathering is caused by rain
water reacting with the mineral grains in
rocks to form new minerals (clays) and
soluble salts. These reactions occur
particularly when the water is slightly
acidic.
These reactions include
oxidation, hydrolysis, and
solution (carbonation). These
processes either form or destroy minerals

3. Where does it occue
• These chemical processes need water,
and occur more rapidly at higher
temperature.
• Warm, damp climates are best. Chemical
weathering (especially hydrolysis and
oxidation)
is the first stage in the production of soils.

4. How does it occure ?
.
.
.
• There are different types of chemical
weathering, the most important are:

5. Oxidation..
Oxidation is the reaction of rock
minerals
with oxygen, thus changing the
mineral
composition of the rock.
When minerals in rock oxidize,
they
become less resistant to
weathering.
Iron, a commonly
known mineral, becomes red or
rust

6. hydrolysis..
• The breakdown of rock by acidic
water to produce clay and soluble
salts
• Hydrolysis takes place when acid
rain
reacts with rockforming minerals
such
as feldspar to
produce clay and salts that are
removed in solution.
• e.g: clay formation.

7. solution.
Removal of rock in
solution by
acidic rainwater. In
particular, limestone i
s weathered by
rainwater containing
dissolved CO2,
(this process is
sometimes
called carbonation).
• e.g: sinkholes.

8. carbonation.
The process by which
rock minerals reacting
with carbonic acid. Carbonic acid is
formed when
water combines with carbon dioxide.
Carbonic acid dissolves or breaks down
minerals in the rock.
CO2 + H2O → H2CO3
• (carbon dioxide + water → carbonic
acid)
• e.g : dissolve limestone produce cavern.

9. THANKS.