1. Drill: Calculate the solubility of PbSO 4 K sp = 2.0 x 10 -14

2. Oxidation Reduction Reactions (REDOX)

3. REDOX Reactions Chemical reactions in which electrons are transferred

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

5. Oxidation Number The charge of a single atom

6. Oxidation The act of losing electrons Oxidation number increases

7. Reduction The act of gaining electrons Oxidation number decreases

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

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

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

11. Determine elements being: oxidized & reduced MnO 4 -1 + NH 3 MnO 2 + NO 2 -1

12. Drill: determine ox # of each element: MnO 4 -1 + Fe Mn 2 O 3 + FeO

13. Balance the following in Acid: MnO 4 -1 + Fe Mn 2 O 3 + FeO

14. Balancing REDOX Reactions

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

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

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

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

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

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

21. Balance Redox Rxn: Cr 2 O 7 -2 + NH 3 Cr +3 + NO 3 -1 in base

22. Balance REDOX Rxn: MnO 4 -1 + N 2 O 3 Mn +2 + N 2 O 5 in acid

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

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

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

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

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

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

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

30. Balance Redox Rxn: IO 3 -1 + I -1 I 3 -1 in acid

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

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

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

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

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

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

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