lect3 - GG325 - GEOCHEMISTRY week 1: lecture 3 Lecture 3...

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1 GG325 L3, F2009 Lecture 3 More General Chemistry Review Pease read chapter 1 and 2 of McSween et al. for this week & Classes of chemical reactions & Mathematically describing chemical reactions GG325 L3, F2009 Chemical reactions Let’s review 6 geochemically pertinent chemical reaction types. The tems in parentheses ( l , g , s and aq ) refer to "liquid", " gas, aka vapor ", "solid" and "dissolved aqueous± phases, respectively. a. Phase change H 2 O( s ) : H 2 O( l ) : H 2 O( g ) These two reactions drive the hydrologic cycle. CaCO 3 ( s ) (aragonite) : CaCO 3 ( s ) (calcite) (important for formation/preservation of carbonate sediments globally) GG325 -- GEOCHEMISTRY week 1: lecture 3
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2 GG325 L3, F2009 Chemical reactions b. Bond Reorganization The Redfield equation of Photosynthesis/Respiration (most plant matter is made and destroyed by organisms using something very close to this): 106CO 2 +16NO 3 - + HPO 4 2- + 122H 2 O +18H + ƒ„ C 106 H 263 O 110 N 16 P + 138O 2 or (CH 2 O) 106 (NH 3 ) 16 (H 3 PO 4 ) + 138O 2 the "Urey" rxn is important for understanding rock weathering and global controls on atmospheric CO 2 : CaSiO 3 (s) + CO 2 (g) : CaCO 3 (s) + SiO 2 (s) GG325 L3, F2009 Chemical reactions c. Dissolution/precipitation & Dissolution/gas release CaSO 4 (s) : Ca 2+ (aq) + SO 4 2- (aq) NaCl(s) : Na + (aq) + Cl - (aq) CO 2 (g) : CO 2 (aq) GG325 -- GEOCHEMISTRY week 1: lecture 3
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3 GG325 L3, F2009 Chemical reactions d. Oxidation/Reduction - "Redox": electron transfer MnO 2 ( s ) + 4H + + 2Fe 2+ ( aq ) : Mn 2+ ( aq ) + 2H 2 O + 2Fe 3+ ( aq ) An important reaction all over the hydrosphere/geosphere Photosynthesis/Respiration is in this category too e. ion substitution - many different sub classes of this process will be important this semester. Na + ( aq ) + [clay mineral]-K + : K + ( aq ) + [clay mineral]-Na + cation exchange between a clay mineral and ions in water GG325 L3, F2009 EDTA Chemical reactions f. Complexation/Chelation Fe 2+ (aq) + 6H 2 O : Fe(H 2 O) 6 2+ (aq) hydration of Fe 2+ in water aqueous metal complex with dissolved organic carbon a common multidentate ligand GG325 -- GEOCHEMISTRY week 1: lecture 3
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4 GG325 L3, F2009 Mathematically describing chemical reactions how do we quantify reactions using chemical equations?
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lect3 - GG325 - GEOCHEMISTRY week 1: lecture 3 Lecture 3...

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