Drill: Calculate the solubility of PbSO 4 K sp = 2.0 x

Oxidation Reduction Reactions (REDOX)

REDOX Reactions Chemical reactions in which electrons are transferred

Chemical Charge A positive, neutral, or negative number assigned to a particle & determined by the difference between the # of protons & electrons

Oxidation Number The charge of a single atom

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 MnO NH 3 MnO 2 + NO 2 -1

Drill: determine ox # of each element: MnO Fe Mn 2 O 3 + FeO

Balance the following in Acid: MnO Fe Mn 2 O 3 + FeO

Balancing REDOX Reactions

Balancing Redox Rxns 1)Determine all ox # 2)Determine elements being oxidized & reduced 3)Divide rxn into half-rxns 4)Balance half-rxns

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

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

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

Drill: Determine Ox #: MnO 2 + Cl -1 Mn +2 + Cl 2 in acid

Balance Redox Rxn: MnO 2 + Cl -1 Mn +2 + Cl 2 in acid

Balance Redox Rxn: Cr 2 O NH 3 Cr +3 + NO 3 -1 in base

Balance REDOX Rxn: MnO N 2 O 3 Mn +2 + N 2 O 5 in acid

Drill: Determine Ox # for All MnO 4 -1 N 2 O 3 Mn +2 N 2 O 5

Balance Redox Rxn: FeCl 2 + KNO 3 FeCl 3 + KNO 2 in base

Balance Redox Rxn: SO 2 + Pb(OH) 2 SO 3 + Pb in base

Drill Balance the following half-reaction: H 2 OO 2 In acid

Balance Rxn: HNO 3 + Cu N 2 O + Cu +2

Balance Redox Rxn: Fe(NO 3 ) 3 + Cr(OH) 4 -1 Fe(NO 3 ) 2 + CrO 4 -2

Balance Redox Rxn: SnF 2 + KIO 4 KI + SnF 4 in acid

Balance Redox Rxn: IO I -1 I 3 -1 in acid

Balance Redox Rxn: MnO 2 + P 4 Mn 2 O 7 + PH 3 in acid

Balance Redox Rxn: PbBr 2 + O 2 + K + PbBr 4 + K 2 O in acid

Balance Redox Rxn: Ca + VO 4 -3 CaO + V +2 in acid

Balance Redox Rxn: Ni(OH) 2 + N 2 H 4 Ni + N 2 in base

Balance Redox Rxn: P 2 O 3 + K 2 CrO 3 K 3 PO 4 + Cr +2 in acid

Balance Redox Rxn: SO + H 2 Cr 2 O 7 H 2 SO 4 + Cr +2

Balance Redox Rxn: PH 3 + KMnO 4 P 2 O 5 + Mn 2 O 3 in KOH