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Chem_173B_HW4_2008_Key

Chem_173B_HW4_2008_Key - Chem 173B/268B Prof S Scott 1...

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Chem 173B/268B Homework assignment #4 Answer Key Prof. S. Scott 1. (a) Explain why NF 3 (bp -129 °C) is more volatile than NH 3 (bp -33 °C). NF 3 is less polarizable because of the hard fluorides and therefore the van der Waals interactions are weaker than in NH 3 . (b) Explain why NH 3 is a much stronger base than NF 3 . Fluoride is highly electronegative and it decreases the electron density on N, compared to hydride which allows a lot of electron density on N. 2. Cyanogen, (CN) 2 , is called a pseudohalide because its chemistry closely resembles that of the group 17 elements. Using this analogy, predict: (a) what happens when Cl 2 (g) is bubbled through an aqueous cyanide solution Cl 2 (g) + 2 CN - (aq) 2 Cl - (aq) + (CN) 2 (g) (b) what happens when cyanogen gas is bubbled through water. (CN) 2 + H 2 O HOCN/OCN - + H + + CN - 3. Use VSEPR to predict the structures of (a) SbCl 5 no lone pair on Sb(V); trigonal bipyramidal (b) FClO 3 no lone pair on Cl(VII); pseudo-tetrahedral (c) [ClF 6 ] + no lone pair on Cl(VII); octahedral (d) XeO 2 F 2
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