Exam 4 - CHEMISTRY 116 Exam 4 Dr. T.R Chigwada August 2,...

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CHEMISTRY 116 Exam 4 Dr. T.R Chigwada August 2, 2007 An optical scoring machine will grade this examination. The machine is not programmed to accept the correct one of two or more sensed answers and will not sense answers that are lightly marked. Mark your sheet carefully with a No. 2 soft lead pencil and erase any undesired marks COMPLETELY . Avoid making any extraneous marks on the answer sheet other than the information mentioned below. On the answer sheet: 1. Print your name in the space for NAME (last name first, CIRCLE your last name). 2. In the space marked SUBJECT write Chem 116. 3. In the space marked TEST NO. write Exam 4. 4. In the space DATE write Summer 07 5. In the space marked PERIOD write Chigwada. 6. Check to see that you have 21 examination questions, a periodic table, and a scantron. Hand in only the answer sheet!! Useful Equations and Constants: R = 0.08206 L atm/mol K = 8.314 J/mol K 1 atm = 760 torr = 760 mm Hg K w = 1.0 x 10 -14 Relax and Good Luck !!!!! a ac - b -b x 2 4 2 ± =
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1. The charge on the metal ion in the coordination complex ion, [Co(CO 3 ) 3 ] 3 , is A) 0 B) 2+ C) 3 D) 3+ E) 6 2. Many, but not all coordination complexes are colored due to absorption of light in the visible region of the spectrum. Which one of the following coordination complexes of transition metals is definitely not expected to be a colored complex ? Hint: Consider the electronic configuration of the metal cation. A) [Co(NH 3 ) 6 ] 3+ B) [Cr(NH 3 ) 6 ] 2+ C) [Cu(NH 3 )] 4 2+ D) [V(H 2 O) 6 ] 3+ E) [Zn(NH 3 )] 4 2+ 3. The coordination numbe r of platinum in the complex ion, [Pt(C 2 O 4 ) 2 ] 2 , is A) 1 B) 2 C) 3 D) 4 E) 6 4. The following order is observed in the spectrochemical series for the ligands listed, CN > NO 2 > en > NH 3 > H 2 O > C 2 O 4 2 > OH > F > Cl > Br > I It was observed that for the two 6 coordinate cobalt complexes,
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Exam 4 - CHEMISTRY 116 Exam 4 Dr. T.R Chigwada August 2,...

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