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Final exam A key

Final exam A key - Chemistry 1C Final Exam First letter of...

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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 ? 3. What is the formal charge on N 3 ? 4. Using hyperconjugation to describe the electron distribution in SF 4 , what is the charge on sulfur? 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.)
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