Drill: Calculate the solubility of PbSO4 Ksp = 2.0 x 10-14

Oxidation Reduction Reactions (REDOX)

Chemical reactions in which electrons are transferred REDOX Reactions Chemical reactions in which electrons are transferred

Oxidation The act of losing electrons Oxidation number increases

Reduction The act of gaining electrons Oxidation number decreases

REDOX Fact You cannot have oxidation without reduction or reduction without oxidation

Oxidizing Agent A substance that oxidizes another The oxidizing agent will be reduced

Reducing Agent A substance that reduces another The reducing agent will be oxidized

Determine elements being: oxidized & reduced __ MnO4-1 + __ NH3 __ MnO2 + __ NO2-1

Drill: determine ox # of each element: __MnO4-1 + __Fe __Mn2O3 + __Fe+2

Balancing REDOX Reactions

Balancing Redox Rxns Determine all ox # Determine elements being oxidized & reduced Divide rxn into half-rxns Balance half-rxns

Balancing Half-Rxns Balance redox elements Balance ox # with e- Balance e- between the two half-rxns

Balancing Half-Rxns Balance total charge with H+ or OH- Balance H’s with water Check balance with oxygen

Balancing Redox Rxns 5) Add the two half-reactions Cancel like substances from each side of the full reaction Check work

Balance Redox Rxns: MnO2 + Cl-1 Mn+2 + Cl2 in acid

AP CHM HW Read: Chapter 4.3 Problem: 40 Page: 108

CHM II HW Read: Chapter 4.5 Problem: 45 Page: 170

Balance Redox Rxns: Cr2O7-2 + NH3 Cr+3 + NO3-1 in base

Drill: Balance: MnO4-1 + N2O3 Mn+3 + N2O5 in base

Drill: Balance Rxns: HNO3 + Cu N2O + Cu+2

Balance Redox Rxns: SO2 + Pb(OH)2 SO3 + Pb in base

Balance Redox Rxns: MnO2 + P4 Mn2O7 + PH3 in acid

AP CHM HW Read: Chapter 4.3 Problems: 41 Page: 108

CHM II HW Read: Chapter 21 Problems: 3 Page: 893

Balance Redox Rxns: FeCl2 + KNO3 FeCl3 + KNO in base

Balance Redox Rxns: SnF2 + KIO4 KI + SnF4 in acid

Balance Redox Rxns: IO3-1 + I-1 I3-1 in acid

Balance Redox Rxns: PbBr4 + K2O PbBr2 + O2 in acid

Balance Redox Rxns: Ca + VO4-3 CaO + V+2 in acid

Balance Redox Rxns: Fe(OH)3 + Cr(OH)4-1 Fe(OH)2 + CrO4-2

Balance Redox Rxns: Ni(OH)2 + N2H4 Ni + N2 in base

Balance Redox Rxns: K3PO4 + Cr+2 P2O3 + K2CrO3 in acid

Balance Redox Rxns: H2SO4 + Cr+2 SO + H2Cr2O7 in acid

Balance Redox Rxns: PH3 + KMnO4 P2O5 + Mn2O3 in KOH