Homework 1 - solutions

Homework 1 - solutions - MAT33Fall2008Homework#1Solutions...

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MAT 33 – Fall 2008 Homework #1 - Solutions Due: 09/01/08 1.) What bonding type would be expected for the following materials? a.) germanium b.) polypropylene c.) calcium fluorite d.) brass e.) iron oxide f.) liquid oxygen g.) double stranded DNA a) Covalent b) Mixed – covalent backbone, Van der Waals between chains c) Predominantly ionic (with some covalent character) d) Metallic e) Predominantly ionic (with some covalent character) f) Covalent within O 2 molecules; van der Waals (fluctuating dipoles) between adjacent O 2 molecules. g) Predominantly covalent bonding 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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Homework 1 - solutions - MAT33Fall2008Homework#1Solutions...

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