Weathering - Weathering Chemical Weathering chemical...

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Weathering Chemical Weathering chemical weathering is the decomposition of soil and rock (change in composition) by biochemical processes weathering pits form where water collects and accentuates rates of chemical weathering Processes 1. oxidation o process by which an element loses an electron to dissolved oxygen o iron is the most commonly oxidized mineral element Fe +2 (ferrous iron) ——> Fe +3 (ferric iron) or 2FeO + O 2 ——> Fe 2 O 3 o other readily oxidized mineral elevments include magnesium, sulfur, aluminum and chromium o among the immediate chemical weathering processes o gives altered earth material a characterisitic yellowish brown to red color o water table is boundary between oxidizing and reducing environments 2. hydroloysis o decomposition of minerals in water as hydrogen ions replace cations in minerals o pure water is a poor H+ donor, however CO2 dissolves in water to produce carbonic acid: o CO 2 + H 2 O ——> H 2 CO 3 (carbonic acid) ——> H + + HCO 3 - (bicarbonate) o soil air is greatly enriched in CO
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This note was uploaded on 12/15/2011 for the course GLY GLY100 taught by Professor Jaymuza during the Fall '10 term at Broward College.

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Weathering - Weathering Chemical Weathering chemical...

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