Eng 45 - Chapter 1 - Structure(24)

Eng 45 - Chapter 1 - Structure(24) - Materials Scien ce...

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Materials Science Fall, 2007 Page 23 dipole bond involves no charge transfer. It has its source in the distribution of charge in the neutral atom or molecule. Many molecules contain permanent dipoles that are due to the inhomogeneity of the internal charge distribution. A familiar example is the water molecule, H 2 O. As shown in Fig. 2.6, the configuration of the water molecule is such that the two hydrogen atoms are asymmetric about the oxygen, and lie to one side of it. Since the hydrogen nucleus is positively charged and the electron cloud is displaced toward the oxygen nucleus, the molecule has an inhomogeneous charge distribution, positive on the hydrogen side, negative on the oxygen side, that constitutes a permanent electric dipole. In the solid state the dipoles align and bond together, as illustrated in Fig. 2.2. Organic molecules often contain ions that create permanent internal dipoles, and bond into solids by aligning these dipoles with one another. = O
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This note was uploaded on 01/26/2010 for the course ENGLISH 45 taught by Professor Morris during the Spring '10 term at University of California, Berkeley.

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Eng 45 - Chapter 1 - Structure(24) - Materials Scien ce...

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