1. Chemistry 104B Dr. Christine Yerkes 207 Chem Annex 333-6353
Mon. and Wed. 11: :00
Tues. and Thurs.1:00 - 2:00
or by appointment

2. Required Text:
Chemistry, 8th ed., Zumdahl
Recommended I >clicker
Quiz sections began: Tuesday, Jan. 17

3. Grading Policy: On-line Homework: 76 pts. Quiz score: 150 pts.
Discussion Quizzes 24 pts.
Hour Exams (3 x 150) 450 pts.
Final Exam pts.
1000 pts.
No make-up quizzes or exams

4. Grades 1000 points total 97-100% (970 - 1000) = A+
% ( ) = B+
% ( ) = B
% ( ) = B-
etc., etc., etc.

5. 150 points Quiz scores: weekly quizzes - material from Lecture and
Quiz section
Quizzes on LON-CAPA
open Wednesday at 5:00
open for 1 week
Three tries – 1st worth 15
2nd worth 13.5
3rd worth 12
keep 10 highest
150 points

6. On-line Homework: 13(?) Homework assignments on LON-CAPA
due dates in the on-line Syllabus and calendar
credit for all problems completed by deadline
normalized to 76 points

7. 150 points Quiz scores: weekly quizzes - material from Lecture and
Quiz section
each quiz worth 15 points -
keep 10 highest
On-line LON-CAPA
attempt %
attempt %
attempt %
150 points

8. Discussion Sections
Worksheets in groups
Discussion Quiz old hour exam problem
5 minutes
3 pts for correct
2 pts for partial
1 pt for attendance
Keep 12 highest 24 pts max
12 bonus points

9. Course Homepage Course Web Sites Chem 104A Lon-Capa = net i.d.
www.
chem.uiuc.edu
Course Web Sites
Chem 104A
Lon-Capa = net i.d.
Password = AD password
homepage

10. Go =
wmax  3
CuCl2 (aq)
+ Al (s) 2
AlCl3 (aq) 2
+ Cu (s) 3 
3 Cu Cl- + 2 Al
2 Al Cl- + 3 Cu
65.0 kJ
0 kJ
-481 kJ
0 kJ
Go =
(3 x 0)
+ (2 x -481)
- (2 x 0)
- (3 x 65)
Go = kJ
w =
- Pext V
w =
- n F 
Electrochemical work

11. 3 CuCl2 (aq)
+ 2 Al (s) 
2 AlCl3 (aq)
+ 3 Cu (s)
Al (s) =
Al0
AlCl3
aluminum chloride
Al0 has _____ electrons 13
Al3+has ______ electrons 10
oxidation state =
oxidation state = 3+
Al0 loses___ e- 3
increase oxidation number
losing e-
= oxidation  3+
LEO
GER
Lose
Electrons
Oxidation
Gain
Electrons
Reduction
Cu2+
Cu (s) 2+ 

12. Rules for oxidation numbers
1. Oxidation number for elements is zero.
N2,
O2,
Na(s),
Co(s),
He (g)
Oxidation number of monatomic ions
is the same as their charge
Group IA = +1
Al3+, Zn2+, Cd2+, Ag+
Group IIA = +2
Oxidation number of oxygen in most compounds
is –2. Exceptions:
H2O2,
O22-
(peroxides) –1
4. Oxidation number of hydrogen is +1
Exceptions:
bonded to metals LiH -1
5. Fluorine is always –1.
Other halogens are –1.
Exceptions:
bonded to O or F, they are positive

13. Assign oxidation numbers to all of the elements:
Li2O
Li =
O =
PF3
P =
F =
HNO3
H =
N =
O =
MnO4-
Mn =
O =
Cr2O72-
Cr =
O =

14. What is the oxidation state of the highlighted element?
P2O5
NaH
SnBr4
BaO2

15. Redox reactions
Zn (s)
+ 2H+ (aq) 
H2 (g)
+ Zn 2+ Zn 
oxidation state H 
oxidation state

16. 2H2(g)
+ O2 (g) 
2H2O(l) H
loses or gains electrons
is oxidized or reduced
oxidizing or reducing agent O
loses or gains electrons
is oxidized or reduced
oxidizing or reducing agent

17. What is the oxidation state of S in each of these
compounds:
H2S
S =
H = S8
S =
SCl2
S =
Cl =
Na2SO3
S =
O =
Na =
SO42-
S =
O =
Which of these compounds can not act as a
reducing agent?
Which of these compounds can not act as a
oxidizing agent?

18. 2H2O
+ Al(s)
+ MnO4- 
Al(OH)4-
+ MnO2
H2O
What is being oxidized? Al
What is oxidation?
MnO4-
LEO
Al(OH)4-
MnO2
How many e-?
What is being reduced?
GER
What is the reducing agent?

19. Cd(s)
+ NiO2
+ 2H2O 
Cd(OH)2
+ Ni(OH)2
What is being oxidized?
What is being reduced?
What is the oxidizing agent?
What is the reducing agent?
How many electrons are transferred?