Transcript Chemistry 102B - University of Illinois at Urbana–Champaign

Chemistry 102A/E
Dr. Christine Yerkes
207 Chem Annex
333-6353
[email protected]
Mon. and Wed. 1:00 - 2:00
Tues. and Thurs.2:00 - 3:00
or by appointment
Required Texts:
Chemistry, 7th ed., Zumdahl
Quiz sections begin: Wed., Aug. 29
Merit sections begin tomorrow
Grading Policy:
On-line Homework:
Exam Correction
Quiz score:
Participation
Hour Exams (3 x 150)
Final Exam
75 pts.
10 pts.
150 pts.
15 pts.
450 pts.
300 pts.
1000 pts.
No make-up quizzes or exams
Grades
1000 points total
97-100% (970 - 1000) = A+
93 - 96% (930 - 969) = A
90 - 92% (900 - 929) = A87 - 89% (870 - 899) = B+
83 - 86% (830 - 869) = B
80 - 82% (800 - 829) = Betc., etc., etc.
Quiz scores:
weekly quizzes - material from Lecture and
Quiz section
each quiz worth 15 points - keep 10 highest
After H.E. I and II – correct errors 10 points
TA evaluation - 15 points
175 points
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 75 points
Course Homepage
http:// www.chem.uiuc.edu
Course Web Sites
Chem 102A/E
Lon-Capa = net i.d.
Password = AD password
homepage
Chemistry understand nature
atomic or molecular level
observation
hypothesis
experiment
prediction
observation
measurement of physical phenomena
number
units
charge of an electron
- 0.00000000000000000160 coulombs
Scientific Notation
Scientific Notation
0.000000000000000000160
integer
number x 10n
1-9
1.60 x 100 = 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
Significant figures
uncertainty in last digit
5.08 x 104
3 sig.fig.
5.07 5.09
50,700 50,800
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
(5.40 x 10-3)
3 sig.fig
rounding
limiting
 5 round up
round at end of
< 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
5
sig
fig
760.00
760.00
0.9716
SI units
mass
length
time
temperature
amount
kilogram
meter
second
kelvin
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
1L
1 gal
1.057 qt
1 gal = 4 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