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Unformatted text preview: CHEMISTRY 151.001 Fall 2007 Problem Set 7 1. Indicate the type(s) of intermolecular attractive forces you would expect to hold each of the following molecules together (with other like molecules) in the liquid phase [(van der Waals attractive forces (VDW), dipole/dipole (DD), H-bonding (H)]. Rank the following molecules in terms of their relative boiling points (1=highest). Explain your reasoning. Attractive Intermolecular Forces N H N NH 2 Relative boiling point ______ ______ ______ 2. Below is a general depiction of DNA highlighting the H-bonds between the complementary base pairs (C-G and A-T). The structures of each of the bases are shown below. Draw in the H-bonds responsible for holding the strands of DNA together in the double helix (imagine the molecules are fixed as they are drawn below do not spin or flip the molecules). Which base pair is more stable? N N N O N N sugar N N N O H H H H H sugar guanine cytosine N N O O H 3 C sugar thymine H N N N N N H H sugar adenine CHM 151 (HLS); Problem Set 7...
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