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Class admin

Class admin. Turn in revision exercise #2 Pick up and fill out TA evaluation forms Pink = Adrienne White = Khadine. Oxygen uptake by Co(salen). Notes on part 2 of lab: Bring stopwatch Depending on yields, may carry out project as a group. Last week: prepared Co(salen).

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Class admin

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  1. Class admin • Turn in revision exercise #2 • Pick up and fill out TA evaluation forms • Pink = Adrienne • White = Khadine

  2. Oxygen uptake by Co(salen) • Notes on part 2 of lab: • Bring stopwatch • Depending on yields, may carry out project as a group

  3. Last week: prepared Co(salen) • Co(salen) can bind oxygen, just like the biological heme molecule easy hard versus

  4. Oxygen binding depends on Co environment Mercury view • In crystals: • Solvated: • Co(salen) exists with Co in a 4, 5, or 6 coordinate site • Solvated Co(salen) will bind O2 when it is 5 or 6 coordinate

  5. Experimental apparatus Which way will the water move? How many SF’s to report?

  6. Graphing data • What is our: dependent variable independent variable • Which one belongs on which axis? • How do we best extrapolate to infinite time?

  7. Revision exercise #2 • Goal: submit an improved version of your lab 6 (MIMT) report • Take your report to the University Writing Center for feedback in paper and electronic form [computers available there] • You can skip the “Questions” section in your re-write – please focus on the report text (Title, Introduction, Data Analysis, Discussion) • Turn in your original and revised lab reports to me, with UWC comments if they are available • Due date: Class period on April 30th (two weeks from today) Note: no other lab report is due that week • Hours for University Writing Center: • Mon-Wed: 10 AM – 10 PM • Thur: 10 AM – 7 PM • Sun: 2 PM – 7 PM • Web site: http://writingprogram.hfa.umass.edu/writingcenter/writingcenter.asp • Located in the Learning Commons of the WE DuBois Library

  8. Writing exercise • Experimental assignment • Communication error • My intent: spend extra time revising the writing (conciseness, organization, flow, transitions, paragraph divisions, grammar, readability, style) • Student interpretation: GRAMMAR • Grading – positive points • Will reward effort • Will reward accomplishment

  9. Evaluation of writing in course • How useful were the lectures on writing Extremely Very Reasonably Somewhat Not at all • How useful were the TA comments on writing on the lab reports Extremely Very Reasonably Somewhat Not at all • How useful were the instructor comments on lab report 5 Extremely Very Reasonably Somewhat Not at all • How useful were the UWC comments on writing the lab reports Extremely Very Reasonably Somewhat Not at all • Comments for improvement on the writing aspects of Chem242

  10. NA exercise • 25 pts / problem -10 if SF errors -5 unit errors • 25 pts for group work (consistency in answers) • Positive points only. (Divide points by 10, score will be added to lab 8 grade)

  11. Experimental • Recrystallization • Solvent temperature – entropic arguments • Evaporation – effect on purity? • Solvent choice (high relative solubility for impurities) • Recrystallization should be done relatively slowly • Anaerobic environment • vacuum • pump / fill cycles

  12. Coordination of metals in inorganic compounds Coordination Number “dentate”

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