151F09_W15_LV_full_post - General Chemistry CHEM 151 Week...

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UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 15
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UA GenChem Our Chemical Reactions so far: Let’s investigate another type of reaction where this is not the case… Precipitation Pb(NO 3 ) 2 (aq) + Na 2 S (aq) PbS (s) + 2 NaNO 3 (aq) Acid/Base Na OH (aq) + H Cl (aq) NaCl (aq) + H 2 O (l) Both: Take place in (aq) solution Have ions whose charges remain constant
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UA GenChem REDOX (Red uction-Ox idation) Cu wire Ag + ions Cu 2+ ions + Ag metal Cu (s) + 2 AgNO 3 (aq) Cu(NO 3 ) 2 (aq) + 2 Ag (s) Chemical reactions with full electron transfers:
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UA GenChem Redox Reactions Redox Reactions 2 Fe (s) + 3 O 2 (g) 2 Fe 2 O 3 (s) REDOX Compare to: FeCl 2 (aq) + Na 2 S (aq) FeS (s) + 2 NaCl (aq) Other examples of REDOX: CH 4 (g) + 2 O 2 (g) CO 2 (g) + 2 H 2 O (l) 3 H 2 (g) + N 2 (g) 2 NH 3 (g) Fe 2 O 3 (s) + 2 Al (s) 2 Fe (s) + Al 2 O 3 (s) What do they have in common? What is different?
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UA GenChem Redox reactions are characterized by: ELECTRON TRANSFER between substances * the actual charge or the charge distribution changes Transfer leads to 1. Increase in oxidation number of an element (lose electrons) = OXIDATION 2. Decrease in oxidation number of an element (gain electrons) = REDUCTION Redox Reactions Redox Reactions
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GenChem Oxidation Numbers Oxidation Numbers AlCl AlCl 3 Al= Al= +3, +3, Cl = Cl = -1 -1 NH NH 3 H= H= +1, +1, N = N = -3 -3 Oxidation
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This note was uploaded on 02/06/2012 for the course CHEM 151 taught by Professor Staff during the Fall '08 term at University of Arizona- Tucson.

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151F09_W15_LV_full_post - General Chemistry CHEM 151 Week...

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