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Important Upcoming Deadlines and Seminar Details for Chemistry Course

This announcement highlights critical deadlines for CAPA assignments, upcoming special seminars on Thursday and Friday, and reminders for grade summaries and quiz pickups. CAPA 18 is due tonight, while CAPA 19 is due Friday. Students should pick up Quiz 8 from the instructor and review grade summaries in class. The outline also includes practice problems for Chapter 19 covering topics such as Coulomb calculations and redox applications, with suggestions for further study and practice to enhance understanding.

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Important Upcoming Deadlines and Seminar Details for Chemistry Course

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  1. Outline: 4/11/07 • CAPA 18 due tonight… • CAPA 19 due Friday… • Special seminar Thursday pm • Special seminar Friday 4pm • Pick up Quiz 8 – from me • Pick up grade summary – in front Today: Finish Chapter 19 • Coulomb Calculations • Redox Applications

  2. Outline: 4/11/07 • CAPA 18 due tonight… • CAPA 19 due Friday… • Special seminar Thursday pm • Special seminar Friday 4pm • Pick up Quiz 8 – from me • Pick up grade summary – in front Today: Finish Chapter 19 SC 1019 6-8pm Panel @ 8pm • Coulomb Calculations • Redox Applications

  3. Outline: 4/11/07 • CAPA 18 due tonight… • CAPA 19 due Friday… • Special seminar Thursday pm • Special seminar Friday 4pm • Pick up Quiz 8 – from me • Pick up grade summary – in front Today: Finish Chapter 19 • Coulomb Calculations • Redox Applications

  4. Quiz #7 • Average = 8.2 Good!

  5. Chapter 19 practice problems: 19.1, 19.3, 19.5, 19.9, 19.11, 19.13, 19.15, 19.17, 19.19, 19.21, 19.23, 19.25, 19.27, 19.33, 19.35, 19.37, 19.39, 19.41, 19.45, 19.49, 19.53, 19.55, 19.63, 19.65, 19.67, 19.69, 19.73, 19.77, 19.81, 19.83, 19.85

  6. Grade Summary Go over grade summary sheet • 8 quizzes / 70 pts (drop one) • 4 pts/seminar report extra credit • CAPA through 17; w/out a few handins • Exam 1, Exam 2 added at 20 or 15% • Final exam 60% or 75% or 90%... • Please see me if there is an data entry error

  7. Calculational Example: • A lead-acid battery: • PbO2+HSO4-+2H++Pb 2PbSO4 +2H2O • Assume 250 g of PbO2 and that this battery supplies 6 Amps until it dies; how long will it last? Finish Chapter 19: • Current = charge/time • 1 Ampere = 1 Coulomb / second

  8. PbO2  PbSO4 (+4  +2) : 2e •  1.045 mol PbO2 × 2 mol e / mol PbO2= • 2.090 mol e • 250 g PbO2 × 1 mol/ 239.2 g = • 1.045 mol PbO2 • 2.090 mol e × 96485 C/mol = • 201654 C • (time) × (6 C/sec) = 201654 C •  time = 3361 sec = 9.34 hours

  9. Problem #3 - Worksheet #12: • Current calculation…. • Which equations? • What is the limiting reagent? • How many moles? • How much time at 0.2 mA?

  10. HgO Hg (+2  0) : 2e • Zn ZnO (0  +2) : 2e • Worksheet #12 • Moles of everything: • 1 g HgO × 1mol/216.6g = 0.00462 mol • 1 g Zn × 1mol/65.4g = 0.01530 mol • What is the limiting reagent? • HgO • Moles of electrons: • 0.00462l mols HgO × 2 mols e-/mol HgO

  11. Moles e- to Coulombs conversion: • 0.00924 mol e- × 96485 C/mol e- • = 891.5 C = 891.5 Amp . sec • How long? • 891.5 Amp . sec = (x sec)(0.2×10-3 Amp) • x = 4.46×106 sec = 1238 hours • Practice! Practice!Practice!Practice!

  12. Redox applications: • Batteries • Fuel Cells • Electroplating • Ore Extraction/Mining • Rust Protection • Metallurgy/Alloys • Electrolysis • Read pp. 847 - 857 in textbook

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