class23_w08

class23_w08 - Increased [CO 2 ] in ocean leads to higher [H...

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Unformatted text preview: Increased [CO 2 ] in ocean leads to higher [H + ]; dissolution of CaCO 3 Approximate overall pH decrease to data ~ 0.1 unit Projected 0.3 unit decrease by 2100 in shallow waters Some marine organisms with CaCO shells Decreased pH increases CaCO solubility aragonite shell magnesium calcite shell Aragonite and calcite: different crystal forms of CaCO 3 Some calcite minerals substitute Mg 2+ for some Ca 2+ Aragonite and magnesium calcite are more soluble than calcite, and are more susceptible to CO 2-generated acidification Aragonite oversaturation and undersaturation normal shell Pteropod (aragonite) shell in undersaturated waters-Oxidation states of carbon counting owned electrons provides a means of determining whether a reaction oxidizes or reduces the compound-The C in methane is least oxidized; that in carbon dioxide is most oxidized-Biomass synthesis (carbon cycle) can also be considered a redox reaction Redox reactions in organic molecules Biological oxygen demand: BOD...
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class23_w08 - Increased [CO 2 ] in ocean leads to higher [H...

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