Exam-3-A-2008 - Fall 2008 CHEMISTRY 104 Section 001 Exam 3...

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Fall 2008 CHEMISTRY 104 Section 001 Exam 3 Name: ________________________ ID: ________ Seat #: ______ 1. Which of the following is the strongest oxidizing agent? MnO 4 - + 4H + + 3 e - MnO 2 + 2H 2 O E ° = 1.68 V I 2 + 2 e - 2I - ° = 0.54 V Zn 2+ + 2 e - Zn ° = -0.76 V A) MnO 4 - B) I 2 C) Zn 2+ D) Zn E) MnO 2 Use the following to answer question 2. How many unpaired electrons are found in each of the following complex ions? 2. [Co(NH 3 ) 4 ] 2+ 3. A d 6 ion (Fe 2+ ) is complexed with six strong-field ligands (for example, SCN ). What is the number of unpaired electrons in this complex? A) 0 B) 1 C) 2 D) 3 E) 4 Page 1
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4. Why is nitrogen not able to form molecules with five covalent bonds? A) Because nitrogen can only form a trigonal bipyramidal shape when it bonds with other elements. B) Because nitrogen has such a high ionization energy that having five covalent bonds is not possible. C) Because nitrogen only exists as N 2 gas at room temperature. D) Because of nitrogen's small size and lack of available d orbitals for electrons. E) At least two of the above are correct. 5. Consider the hydrogen–oxygen fuel cell where H 2 (g) + O 2 (g) H 2 O(l) Δ G ° = –237.18 kJ/mol H 2 Which of the following statements is true? A) At standard conditions, the maximum work the fuel cell could do on the surroundings is 237.18 kJ/mol. B) In the real world, the actual amount of useful work the cell can do is less than 237.18 kJ. C) More energy is dissipated as waste heat in the fuel cell than in the reversible pathway. D) a, b, and c are all true. E) a, b, and c are all false. 6. The element found in bauxite is: A) B B) Al C) Ga D) Tl E) all of these 7. For the dissociation reaction of the acid HF HF(aq) H + (aq) + F (aq) Δ S is observed to be negative. The best explanation is: A) This is the expected result since each HF molecule produces two ions when it dissociates. B) Hydration of the ions produces the negative value of
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This note was uploaded on 02/25/2011 for the course CHEM 222 taught by Professor Harding during the Fall '08 term at CUNY Hunter.

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Exam-3-A-2008 - Fall 2008 CHEMISTRY 104 Section 001 Exam 3...

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