CH145final_practice

CH145final_practice - CH145, Fall 2009 Final Exam Practice...

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CH145, Fall 2009 Final Exam Practice SHOW ALL WORK! 1. The half-life of the radioactive isotope 32 P is 14.3 days. How long will it take for a given sample of the isotope to lose 99.0% of its radioactivity? 8 pts 2. Is the diatomic species NF paramagnetic or diamagnetic? 5 pts 3. Sketch the wave function of a 4s atomic orbital. 5 pts
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CH145, Fall 2009 Page 2 of 5 4. If 1.50 mL of 0.500 M HCl was added to 100. mL of a 7.50 mM phosphate buffer at an initial pH of 6.86, what is the final pH? (pK a,1 = 2.14, pK a,2 = 6.86, pK a,3 = 12.4) 10 pts 5. Two zinc electrodes are inserted into a single solution of 1.00 M nitric acid and a sufficient voltage is applied to result in electrolysis. 8 pts a) Identify all possible anode half reactions and circle the dominantly produced chemical species. b) Identify all possible cathode half reactions and circle the dominantly produced chemical species.
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CH145, Fall 2009 Page 3 of 5 6. Use the following line diagram of a Voltaic cell at 25 o C to answer the following questions. 14 pts Al (s) | Al 3+ (aq) | | H 2 O 2 (aq) , H + (aq) , H 2 O (l) | Pt (s) a)
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CH145final_practice - CH145, Fall 2009 Final Exam Practice...

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