Chem_173B_HW2_2008

Chem_173B_HW2_2008 - What is the desired reaction that...

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Chem 173B/268B Homework assignment #2 Prof. S. Scott Due in class on Monday, February 11, 2008 1. For each cluster, assess the cluster geometry as closo, nido or arachno, and predict the arrangement of the skeletal atoms: (a) [B 5 H 9 ] (b) [B 10 H 14 ] 2- (c) [C 2 B 9 H 12 ] - 2. The most common lead-containing ore is galena (PbS), whereas Ge and Sn are both found in nature as oxides. Explain. 3. Predict in which direction equilibrium lies, and briefly justify your answer: (a) CuF(s) + HI(aq) CuI(s) + HF(aq) (b) CaBr 2 (s) + H 2 O CaO(s) + 2 HBr(aq) 4. The treatment for acute lead poisoning is chelation therapy , in which a solution containing EDTA is administered intravenously to the patient. (a)
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Unformatted text preview: What is the desired reaction that occurs in chelation therapy? (b) What is a likely side-reaction? (c) Why is it ineffective to ingest EDTA orally (hint: consider that the stomach is highly acidic, pH ~ 1). (d) A more effective therapeutic agent for acute mercury poisoning is 2,3-dimercapto-1-propanol (BAL). Explain why it works better than EDTA for mercury poisoning. 5. Predict the product of the reaction between C 60 and Vaskas complex, IrCl(CO)(PMe 3 ) 2 . 6. Explain why SiO 2 is insoluble in HCl, but dissolves in HF. 7. Draw plausible structures for (a) [MeAl( 3-O)] 4 (b) Ti( 5-Cp) 2 ( 1-Cp) 2 (c) [Mo( 2-S 2 ) 2 ( 2 , 2-S 2 )] 2 2-...
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