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105a Practice exam 4 key

105a Practice exam 4 key - Chemistry 105a Practice Exam 4...

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Chemistry 105a PLEASE PRINT YOUR NAME IN BLOCK LETTERS Practice Exam 4 Name: _____________________________________________ Last 4 digits of USC ID No: ____ ____ ____ ____ Dr. Jessica Parr Lab TA’s Name: _____________________________________ Lab: Tu 9 / Tu 1 / Tu 4 / W 1 / W 4 / F 1 Please circle lab section above First letter of last name Question Maximum Points Score Grader 1 14 2 10 3 16 4 20 5 12 6 10 7 18 Total 100 Please Sign Below: I certify that I have observed all the rules of Academic Integrity while taking this examination. Signature: ________________________________________________________ INSTRUCTIONS: 1. You must show your work to receive credit. 2. If necessary, please continue your solutions on the back of the preceding page (facing you). 3. YOU MUST use black or blue ink. (No pencil, no whiteout.) 4. There are 7 problems on 10 pages. Please count them before you begin. A periodic table is on the last page. 5. Good luck! =) 1
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1. (14 pts) a. (10 pts) What do the letters VSEPR stand for? V S E P R b. (4 pts) MgO, CaO, and Al 2 O 3 have the following lattice energies (in no particular order) -3401, -3791, and -15,916 kJ/mol. Match the appropriate formula with each lattice energy. MgO __________ CaO __________ Al 2 O 3 __________ 2
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Question #2 (10 pts) a. Draw a Lewis structure for ClO 3 - that obeys the octet rule (Cl is the central atom) and indicate the formal charge on each atom. b. Draw a Lewis structure that minimizes formal charge and indicate all the possible resonance structures, if available.
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