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bmb428_problemset17 - 5 Problem 13.15(p 512 Which of the...

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BMB428 Dr. Song Tan Physical Chemistry with Biological Applications Fall 2007 1 Problem Set 17: Intermolecular Forces Due Oct 30, 2007 1. Problem 13.5 (p. 511): List the types of intermolecular forces that exist between molecules (or basic units) in each of the following species: (a) benzene (C 6 H 6 ) (b) CH 3 Cl (c) PF 3 (d) NaCl (e) CS 2 2. What are van der Waal forces? 3. Problem 13.10 (p. 511): Differentiate Equation 16.21 with respect to r to obtain an expression for σ and ε . Express the equilibrium distance, r e , in terms of σ , and show that V = - ε . 4. Problem 13.14 (p. 512): If water were a linear molecule, (a) would it still be polar and (b) would the water molecules still be able to form hydrogen bonds with one another?
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Unformatted text preview: 5. Problem 13.15 (p. 512): Which of the following compounds is a stronger base: (CH 3 ) 4 NOH or (CH 3 ) 3 NHOH? Explain. 6. Problem 13.16 (p. 512) Explain why ammonia is soluble in water but nitrogen trichloride is not. 7. Problem 13.20, reworded (p. 512): Assume the energy of hydrogen bonds per base pair to be 10 kJ/mol, calculate the ratio of two separate strands to double-stranded form in solution at 300 K for (a) 1 base pair (b) DNA strand with 100 base pairs. 8. Problem 13.23 (p. 512): A small drop of oil in water usually assumes a spherical shape. Explain....
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