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42 Review for Final

# 42 Review for Final - Final Exam Monday:00 AM to 1:30 PM...

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1 1 Final Exam Monday, May 18, 11:00 AM to 1:30 PM Rooms TBA, see Bb Cover page w/ info will be posted on Bb Be sure to bring Stony Brook ID card 2 or more #2 pencils Calculator with extra batteries Do not bring cell phones, beepers, iPods, other electronic devices, textbook, and notes. Read and follow directions on the cover page. Be sure to print and bubble in your ID number correctly 2 The truth about test-prep tutoring! Some test-prep services make bold claims. Here is some data. CHE 132 students surveyed, Spring 2009 Regarding experiences in CHE 129 & 131, Fall 2008 GPA = average grade in CHE 129 or 131 of the students in each category 37 2.57 C+ Other 29 2.63 C+ J 35 2.82 B- S 202 2.82 B- Chem LC 272 2.85 B- None Number GPA Service

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2 3 Dr Dave’s End-o-the-Semester Help Sessions May 12 – 14: Tuesday, Wednesday, Thursday Space Reserved in Chemistry Learning Center for CHE 132 Study Groups Chemistry Room 321 Dr Dave will be there 4:00 – 6:00 PM These sessions are student driven. Bring problems you want help solving! Concepts that need clarification! Questions you want answered! And they are free! 4 #18 Calculate the value of K sp for CdS from the following data. (1) CdS(s) + 2e Cd(s) + S 2– (aq) E o = – 1.21 V (2) Cd 2+ (aq) + 2e Cd(s) E o = – 0.40 V Think: K sp reaction?, K G o E o , Use E o =(RT/nF)lnK Turn (2) into an oxidation half cell (3) Cd(s) Cd 2+ (aq) + 2e - E o = + 0.40 V Combine (1) and (3), write the K sp & cell reaction and the standard cell potential. CdS(s) Cd 2+ (aq) + S 2- (aq) E o = -0.81 V -0.81 V = (8.314Jmol -1 K -1 x298K)/(2x96,485C/mol)lnK sp lnK sp = -63.09 K sp =4.0x10 -28