Chemistry 102A/E Dr. Christine Yerkes 207 Chem Annex 333-6353 cyerkes@uiuc.edu 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: 75 pts. Exam Correction 10 pts. Quiz score: 150 pts. Participation 15 pts. Hour Exams (3 x 150) 450 pts. Final Exam 300 pts. 1000 pts. No make-up quizzes or exams

Grades 1000 points total 97-100% (970 - 1000) = A+ 87 - 89% (870 - 899) = B+ 83 - 86% (830 - 869) = B 80 - 82% (800 - 829) = B- etc., etc., etc.

175 points 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 Course Web Sites Chem 102A/E Lon-Capa = net i.d. 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 experiment hypothesis prediction

observation measurement of physical phenomena number units charge of an electron - 0. 1 6 coulombs Scientific Notation

Scientific Notation 0.000000000000000000160 integer number x 10n 1.60 x 10 = 1.60 1-9 1.60 x 101 = 16.0 1.60 x 10-1 = 0.160 1.60 x 10 -19 1.60 or 1.6 or 1.600 Significant figures

Significant figures uncertainty in last digit 5.08 x 104 5.0800 x 104 3 sig.fig. 5 sig.fig 5.07 5.09 5.0799 5.0801 50,700 50,800 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 Zeros to right of digits and decimals are significant

Significant figures (47.03) x (0.00540) = 0.253962 = 0.254 sig.fig 3 sig.fig (5.40 x 10-3) 3 limiting sig.fig rounding  5 round up round at end of calculations < 5 round down 45.6 0.369 + 83.51 limiting 1 decimal place 3 decimal places 2 decimal places 129.47900 129.5

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 738.4 738.41 0.971592105 4 sig fig = 760.00 760.00 5 sig fig 4 sig fig 0.9716

SI units mass kilogram kg length meter m time second s temperature kelvin K amount mole mol TK = TC + 273.15 mole = 6.02 x 1023

SI units mass kilogram kg length meter m time second s temperature kelvin K amount mole mol volume = length3 1 liter (L) = (1 dm)3 = (10 cm)3 = 1000 cm3 1 cm3 = 1 mL

Start with data given, including units. Dimensional Analysis Start with data given, including units. 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 L 1000 mL 1 g = g 3784.295 1 gal 1.057 qt 1 L 1 mL 3780 g 3.78 x 103 g 1 gal = 4 qt 1.057 qt = 1 L 1 g = 1 mL 1000 mL = 1 L