Unit 4 - Week 3 - General Chemistry CHEM 151 Week 15 UA...

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UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 15
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UA GenChem Week 15 Reading Assignment Chapter 3 – Section 3.5 (solution stoichiometry) Chapter 4 – Section 4.5 (redox reactions), Section 4.6  (elements in redox)
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UA GenChem Chemical Reactions Chemical reactions always start when a  center of positive charge in one  reactant ( molecule or ion ) is attracted  to a center of negative charge in  another. C 2 O 4 2- Ca 2+ Ca 2+ (aq) +  C 2 O 4 2- (aq)    CaC 2 O (s) Precipitation  Reaction Acid-Base Reaction      H 2 O (l) +  HCl (aq)    H 3 O + (aq) +  Cl - (aq )
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UA GenChem REDOX  Reactions   Let’s look at chemical reactions with full electron transfers: Cu wire Ag +  ions Cu 2+  ions  + Ag metal Cu   +   2   AgNO 3                Cu(NO 3 ) 2      +   2   Ag
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UA GenChem Oxidation-Reduction Reactions Oxidation-Reduction Reactions 2  Fe(s)  + 3  O 2 (g)   2  Fe 2 O 3 (s)      REDOX  Compare to:                                 FeCl 2  +  Na 2 S      FeS(s)  + 2 NaCl     What is different? 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?
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UA GenChem Redox reactions are characterized by ELECTRON TRANSFER
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This note was uploaded on 06/12/2008 for the course CHEM 151 taught by Professor Staff during the Spring '08 term at University of Arizona- Tucson.

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Unit 4 - Week 3 - General Chemistry CHEM 151 Week 15 UA...

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