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Chemistry 102A/E

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:.

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Chemistry 102A/E

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  1. Chemistry102A/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

  2. Required Texts: Chemistry, 7th ed., Zumdahl Quiz sections begin: Wed., Aug. 29 Merit sections begin tomorrow

  3. 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

  4. Grades 1000 points total 97-100% (970 - 1000) = A+ 93 - 96% (930 - 969) = A 90 - 92% (900 - 929) = A- 87 - 89% (870 - 899) = B+ 83 - 86% (830 - 869) = B 80 - 82% (800 - 829) = B- etc., etc., etc.

  5. 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

  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 75 points

  7. Course Homepage http:// www. chem.uiuc.edu Course Web Sites Chem 102A/E Lon-Capa = net i.d. Password = AD password homepage

  8. understand nature Chemistry atomic or molecular level observation hypothesis experiment prediction

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

  10. Scientific Notation 0.000000000000000000160 integer x number 10n 1.60 x 10 = 1.60 0 1-9 1.60 x 101 = 16.0 1.60 x 10-1 = 0.160 1.60 x 10 -19 1.60 or 1.600 1.6 or Significant figures

  11. Significant figures uncertainty in last digit 5.08 x 104 5.0800 x 104 3 sig.fig. 5 sig.fig 5.09 5.0801 5.07 5.0799 50,800 50,700 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

  12. Significant figures (47.03) x (0.00540) = 0.253962 = 0.254 4 3 sig.fig sig.fig (5.40 x 10-3) limiting 3 sig.fig  5 rounding 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

  13. 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 4 sig fig 5 sig fig 760.00 0.9716

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

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

  16. 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

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