Final exam A key

Final exam A key - Chemistry 1C, Final Exam June 11, 2008...

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Chemistry 1C, Final Exam First letter of your last name: _________ June 11, 2008 FORM A Name ( last, first ): _____________________________________________ Perm #: ____________________________ INSTRUCTIONS: All cell phones and portable electronic devices must be turned off for the duration of the exam. SCANTRON FORM: Use a PENCIL 1) write you name on the form (front and back) 2) Bubble in FORM A 3) Bubble in your Perm number (7 digits only) An information page is provided separately. No other notes or books are allowed. There are 8 pages and 42 questions. Each multiple choice question is worth 1 point. Turn in the exam and Scantron form. A valid Lewis structure of N 5 + is shown below. N N N 2 N 3 N 1 + 1. What is the formal charge on N 1 ? a) -2 b) -1 c) 0 d) +1 e) +2 2. What is the formal charge on N 2 ? a) -2 b) -1 c) 0 d) +1 e) +2 3. What is the formal charge on N 3 ? a) -2 b) -1 c) 0 d) +1 e) +2 4. Using hyperconjugation to describe the electron distribution in SF 4 , what is the charge on sulfur? a) 0 b) +1 c) +2 d) +3 e) +4 5. Using Valance Bond Theory, determine the hybridization used by the sulfur atom in SF 4 . a) sp b) sp 2 c) sp 3 d) sp 3 d e) sp 3 d 2 1
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6. Using VSEPR which molecular geometry would SF 4 adopt? a) square planar b) see-saw c) trigonal prism d) tetrahedral e) T-shaped 7. Which of the following is the correct description of the first excited state of diatomic nitrogen? (The first excited state of a molecule corresponds to an electron arrangement where one electron from the HOMO has been transfer to the LUMO.) a) The excited state of N 2 is diamagnetic and displays a bond order of 2 b) The excited state of N 2 is diamagnetic and displays a bond order of 3 c) The excited state of N 2 is paramagnetic and displays a bond order of 2 d) The excited state of N 2 is paramagnetic and displays a bond order of 2.5 e) The excited state of N 2 is paramagnetic and displays a bond order of 3 8. What is the predicted bond order of Li 2 - ? a) 0 b) 0.5 c) 1 d) 1.5 e) 2 9. Calculate the molality of a 1.20 M solution of acetonitrile (CH 3 CN) in dichloromethane (CH 2 Cl 2 ). Assume the density of the solution is 1.325 g/cm 3 . a) 1.26 mol·kg -1 b) 0.906 mol·kg -1 c) 0.884 mol·kg -1 d) 0.941 mol·kg -1 e) 1.05 mol·kg -1 10. Calculate the mole fraction of acetonitrile for the solution in question 9.
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This note was uploaded on 08/06/2008 for the course CHEM 1C taught by Professor Hooker during the Summer '06 term at UCSB.

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Final exam A key - Chemistry 1C, Final Exam June 11, 2008...

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