Chemical Weathering Processes (Leaving Cert Geography): Flashcards
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14 cards from this deck
What does chemical weathering transform?
What does chemical weathering transform?
Both physical appearance & chemical composition
Definition of aggregates in rocks
Definition of aggregates in rocks
2+ minerals held together by bonding agents
Essential ingredient for chemical weathering
Essential ingredient for chemical weathering
Water
3 main types of chemical weathering
3 main types of chemical weathering
Carbonation, hydration & hydrolysis, oxidation
What does carbonation involve?
What does carbonation involve?
Carbonic acid formation
Equation for carbonic acid formation
Equation for carbonic acid formation
H2O + CO2 = H2CO3
Rocks most affected by carbonation
Rocks most affected by carbonation
Limestone & chalk (calcium carbonate rocks)
Landforms created by carbonation
Landforms created by carbonation
Limestone pavement & karst landscapes
Definition of hydration
Definition of hydration
Rock minerals absorb water & expand
What hydrolysis produces
What hydrolysis produces
Clay (kaolin)
Feldspar transformation in hydrolysis
Feldspar transformation in hydrolysis
Transforms into kaolin (china clay)
Effect of 10°C increase on hydrolysis rate
Effect of 10°C increase on hydrolysis rate
Rate doubles
Definition of oxidation
Definition of oxidation
Oxygen reacts with metal minerals (esp. iron)
Colour produced by oxidation
Colour produced by oxidation
Reddish-brown (from iron oxides)