1. Homework Questions 1-3 on page 640

2. Homework 1. Identify each of the following changes as either oxidation or reduction. Recall that e - is the symbol for an electron. a.I 2 + 2e - → 2I -

3. Homework 1. Identify each of the following changes as either oxidation or reduction. Recall that e - is the symbol for an electron. a.I 2 + 2e - → 2I - reduction

4. Homework 1. Identify each of the following changes as either oxidation or reduction. Recall that e - is the symbol for an electron. b.K → K + + e -

5. Homework 1. Identify each of the following changes as either oxidation or reduction. Recall that e - is the symbol for an electron. b.K → K + + e - oxidation

6. Homework 1. Identify each of the following changes as either oxidation or reduction. Recall that e - is the symbol for an electron. c.Fe 2+ → Fe 3+ + e -

7. Homework 1. Identify each of the following changes as either oxidation or reduction. Recall that e - is the symbol for an electron. c.Fe 2+ → Fe 3+ + e - oxidation

8. Homework 1. Identify each of the following changes as either oxidation or reduction. Recall that e - is the symbol for an electron. d.Ag + + e - → Ag

9. Homework 1. Identify each of the following changes as either oxidation or reduction. Recall that e - is the symbol for an electron. d.Ag + + e - → Ag reduction

10. Homework 2. Identify what is oxidized and what is reduced in the following processes. a.2Br - + Cl 2 → Br 2 + 2Cl -

11. Homework 2. Identify what is oxidized and what is reduced in the following processes. a.2Br - + Cl 2 → Br 2 + 2Cl - ox red

12. Homework 2. Identify what is oxidized and what is reduced in the following processes. b. 2Ce + 3Cu 2+ → 3Cu + 2Ce 3+

13. Homework 2. Identify what is oxidized and what is reduced in the following processes. b. 2Ce + 3Cu 2+ → 3Cu + 2Ce 3+ red ox

14. Homework 2. Identify what is oxidized and what is reduced in the following processes. c.2Zn + O 2 → 2ZnO

15. Homework 2. Identify what is oxidized and what is reduced in the following processes. c.2Zn + O 2 → 2ZnO ox red

16. Homework 3. Identify the oxidizing agent and the reducing agent in each of the following reactions. a.Mg + I 2 → Mg I 2

17. Homework 3. Identify the oxidizing agent and the reducing agent in each of the following reactions. a.Mg + I 2 → Mg I 2 red ox

18. Homework 3. Identify the oxidizing agent and the reducing agent in each of the following reactions. b.2Na + 2H + → 2Na + + H 2

19. Homework 3. Identify the oxidizing agent and the reducing agent in each of the following reactions. b.2Na + 2H + → 2Na + + H 2 red ox

20. Homework 3. Identify the oxidizing agent and the reducing agent in each of the following reactions. c.H 2 S + Cl 2 → S + 2HCl

21. Homework 3. Identify the oxidizing agent and the reducing agent in each of the following reactions. c.H 2 S + Cl 2 → S + 2HCl red ox

22. Determining Oxidation Numbers There are nine rules. You do not have to memorize them. But you do have to use them.

23. Determining Oxidation Numbers KClO 3

24. Determining Oxidation Numbers KClO 3 O is always -2 (rule 5) K is +1 (rule 7) The sum is zero (rule 8)

25. Determining Oxidation Numbers KClO 3 N K + N Cl + 3(N O ) = 0 O is always -2 (rule 5) K is +1 (rule 7) The sum is zero (rule 8)

26. Determining Oxidation Numbers KClO 3 +1 + N Cl + 3(-2) = 0 O is always -2 (rule 5) K is +1 (rule 7) The sum is zero (rule 8)

27. Determining Oxidation Numbers KClO 3 N Cl = +5 O is always -2 (rule 5) K is +1 (rule 7) The sum is zero (rule 8)

28. Determining Oxidation Numbers SO 3 2- O is always -2 (rule 5) The sum is -2 (rule 9)

29. Determining Oxidation Numbers SO 3 2- N S + 3(N O ) = -2 O is always -2 (rule 5) The sum is -2 (rule 9)

30. Determining Oxidation Numbers SO 3 2- N S - 6 = -2 O is always -2 (rule 5) The sum is -2 (rule 9)

31. Determining Oxidation Numbers SO 3 2- N S = +4 O is always -2 (rule 5) The sum is -2 (rule 9)

32. Try a few on your own: Due at the end of the period: Problems 4-9 on pages 642-643 Homework: Problems 10-11 on page 643