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Chem_173B_HW1_2008 - attributed to covalency in its bonding...

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Chem 173B/268B Homework assignment #1 Prof. S. Scott Due in class on Monday, February 4, 2006 1. Predict the reactions of each of the following compounds with water: (a) CaH 2 (b) MgC 2 (c) H 2 S (d) CH 4 (e) BaO 2 (f) KO 2 (g) LiBr (h) Al 2 O 3 (i) NaN 3 (j) NH 3 2. AlF 3 is insoluble in liquid HF, but dissolves if NaF is present. When BF 3 is added to the solution, AlF 3 precipitates. Explain these observations in terms of the nature of the reactions occurring at each step. 3. Of all the alkali metal halides, LiF is the least soluble fluoride, KCl is the least soluble chloride and CsI is the least soluble iodide. Explain. 4. LiI is reasonably soluble in organic solvents. This is sometimes mistakenly
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Unformatted text preview: attributed to covalency in its bonding. Provide a purely thermodynamic explanation. 5. Estimate the zero-point energies of HCl and DCl, given that the fundamental stretching frequency of HCl(g) is 2900 cm-1 . Which bond is stronger? Explain. 6. Calculate the difference in pH of saturated aqueous solutions of Mg(OH) 2 and Ca(OH) 2 , given their values of K sp (298 K) are 5.6 x 10-12 and 6.5 x 10-6 , respectively (standard state: 1 M). 7. For each cluster, assess the cluster geometry as closo, nido or arachno, and predict the arrangement of the skeletal atoms: (a) [B 7 H 7 ] 2-(b) C 3 B 3 H 7...
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