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

2. Oxidation Reduction Reactions (REDOX)

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

4. Oxidation
The act of losing electrons
Oxidation number increases

5. Reduction
The act of gaining electrons
Oxidation number decreases

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

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

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

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

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

11. Balancing REDOX Reactions

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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