Chemistry 102D
Dr. Amy Nicely
205 Chem Annex
anicely@illinois.edu
Office Hours:
Mondays 3-4pm
Thursdays 1-2pm
or by appointment
Required Materials:
Chemistry, 8th ed., Zumdahl
i>clicker
Scientific calculator
Grading Policy:
On-line Homework
Class Participation
Quizzes (10 x 10)
Hour Exams (3 x 100)
Final Exam
70 pts.
30 pts.
100 pts.
300 pts.
300 pts.
800 pts.
No make-up quizzes or exams
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 70 points
Course Homepage
http:// www.chem.uiuc.edu
Course Web Sites
Chem 102D
Lon-Capa = net i.d.
AD password
Class Participation:
Purchase and register an i>clicker
Bring i>clicker to lecture every day
Receive 1 point for every problem
attempted and 0.2 bonus points for every
correct answer
normalized to 30 points
Quiz scores:
weekly quizzes - material from Lecture and
Quiz section
each quiz worth 10 points - keep 10 highest
100 points
Exams:
Hour exams take place on Thursday evenings
from 7:00-8:10pm
Exam dates are September 23, October 28
and December 2
Conflict exams are offered at 5:35pm on the
same dates; you must sign up in advance
100 points each
Exams:
Final exam is Friday, December 17 from
1:30 - 4:30pm
The exam is cumulative
300 points
Grades
800 points total
93 - 100%
90 – 92.9%
87 – 89.9%
83 – 86.9%
80 – 82.9%
etc., etc., etc.
(744 - 800) = A
(720 - 743) = A(696 - 719) = B+
(664 - 695) = B
(640 - 663) = B-
observation
measurement of physical phenomena
number
units
charge of an electron
- 0.00000000000000000160 coulombs
Scientific Notation
0.000000000000000000160
integer
number x 10n
1-9
0
1.60 x 10 = 1.60
1.60 x 101 = 16.0
1.60 x 10-1 = 0.160
-19
1.60 x 10
1.60 or 1.6 or 1.600
Significant figures
uncertainty in last digit
5.08 x 104
3 sig.fig.
5.07 5.09
50,700 50,900
5.0800 x 104
5 sig.fig
5.0799 5.0801
50,799
50,801
1. All non zero digits are significant
2. Zeros between digits are significant
3. Zeros to left of digits are not significant
4. Zeros to right of digits and decimals are
significant
Significant figures
(47.03) x (0.00540) = 0.253962 = 0.254
4 sig.fig
3 sig.fig
-3
(5.40 x 10 )
3 sig.fig
rounding
limiting
round at end of
≥ 5 round up
< 5 round down calculations
45.6 1 decimal place
0.369 3 decimal places
+ 83.51 2 decimal places
129.47900
129.5
limiting
Significant figures
732.11 + 6.3 =
760.00
do addition (subtraction) first
732.11+ 6.3 = 738.41 (738.4)
2 decimal 1 decimal
1 decimal
do multiplication (division) last
738.4 4 sig fig 738.41 = 0.971592105
4 sig fig
760.00 5 sig fig 760.00
0.9716
SI units
mass
kilogram
length
meter
time
second
temperature kelvin
amount
mole
TK = TC + 273.15
mole = 6.02 x 1023
kg
m
s
K
mol
SI units
mass
length
time
temperature
amount
kilogram
meter
second
kelvin
mole
kg
m
s
K
mol
volume = length3
1 liter (L) = (1 dm)3 = (10 cm)3 = 1000 cm3
1 cm3 = 1 mL
Dimensional Analysis
1. Start with data given, including units.
2. Determine the units in the answer
3. Find conversion factors
What is the mass, in grams, of 1.00 gallon
of water? The density of water is 1 g/mL.
3
∞
1.00 gal
4 qts
1 gal
1 gal = 4 qt
∞
1L
1.057 qt
1.057 qt = 1 L
∞
1000 mL
1L
1 g = 1 mL
∞
1 g = 3784.295 g
1 mL 3780 g
3.78 x 103 g
1000 mL = 1 L