Homework 1 - solutions

Homework 1 - solutions - MAT 33 Fall 2007 Due Homework#1...

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MAT 33 – Fall 2007 Homework #1 - Solutions Due: 09/03/07 1.) What bonding type(s) would be expected for the following materials? a.) silicon carbide b.) potassium iodide c.) nylon d.) bronze e.) liquid bromine f.) double stranded DNA a) Predominantly covalent (with some ionic character) b) Predominantly ionic (with some covalent character) c) Mixed – covalent backbone; Van der Waals between chains d) Metallic e) Covalent within Br 2 molecules; van der Waals (fluctuating dipoles) between adjacent Br 2 molecules. f) Predominantly covalent backbone in backbone; Hydrogen bonding between DNA strands. 2.) Explain the following observations in terms of the characteristics of the relevant bond type. a.) Radon has a higher melting point than helium. (Radon T m = -71 o C : Helium T m = -272.2 o C) b.) Ice has a lower density than water. c.) Methane (CH 4 ) has a much lower boiling temperature than water (H 2 O). a.) The liquefaction and solidification of the noble gases at low temperature and high pressures are attributed to fluctuating dipole bonds. As the atomic size of the
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  • Fall '07
  • keith
  • Atom, Van der Waals, R R R, Predominantly covalent backbone

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