classes%5Cwinter09%5C171ID38%5CFinalExamCHEM171w08

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1 CHEM 171, FINAL EXAM, MAR 17 07, W’08, YAGHI, 200 points NAME: TA: Signature: NOTE: The exam is 12 questions on 8 pages onto which you should provide your answers. A periodic table of the elements is attached on page 9. 1. (20 points) Circle the molecules that are Lewis bases and justify your choice in one short sentence. a. SO 2 b. B(OH) 3 c. ClO 2 d. SO 3 2‐ e. C 5 H 5 N 2. (10 points) a. List the number and kind of faces for a truncated icosahedron.
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2 (10 points) b. Write the chemical formula for a structure that is based on the truncated icosahedron. 3. (35 points) Draw a plausible Lewis‐type structure for each of the following discrete molecules and ions: a. S 3 N 3 b. Te 3 2‐ c. S 20
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3 d. N 2 O 3 e. F 2 IO 2 f. ClO 4 (chlorate) g. SiO 4 4‐
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4 4. (20 points) Draw the structures of two C allotropes
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5 5. (10 points) Draw a possible structure for Al 4 (OR) 12 6. (20 points) What do you expected the geometry to be around Pt and S in PtS? Is this a molecular or extended structure?
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6 7. (10 points) Suggest a structure for Cd(CN) 2 8. (20 points) TiC is a cubic close packed structure based on packing of C anions. How many
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