207 - 207.48 The metal matrix is composed of central...

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207.48. The metal matrix is composed of central nucleus in a "sea" of free electrons from the outer "shell". This "sea" of electrons moves away from the end if electrons are pushed in. this pressure on the electrons passes down the metal to the other end where the excess "drop off" completing the circuit. It is this "mobile sea" of electrons that makes the metallic lattice a good conductor of both heat AND electricity. 229.22. The stronger bond is the one with more bond energy. That would be H2. It took more energy to make the bond, so more energy is required to break it. Pretty simple 236.26. sp2 would be trigonal planar, sp3 would be tetrahedral, and sp would be linear. Ask us anything! 236.27. Sigma bond is nothing but the overlap of half filled atomic orbitals along the nuclear axis. In the case of two half filled 1s orbitals. .. the electrons approch each other as well as repells. .. because of nucleus(attraction) and the other electron(repulsion). . so they stay in the middle of these two opposing forces and forms a bond. .so called sigma bond. 236.28. 2 pi and 3 sigma 236.29. BF3 is trigonal planar because it has 3 bonds and no lone pairs of electrons.NH3 has three bonds and one lone pair of electrons and is trigonal pyramidal. 244.36. CCl4 is not polar because the 4 Cl atoms are symmetrically spaced around the C, balancing out their electron pull. 236.38. Covalent compounds exist as molecules made of two or more atoms joined together. The atoms share electrons between them in a stable chemical (covalent) bond. 247.40. C6H8O6 has 6 carbon atoms, 8 hydrogen atoms, and 6 oxygen atoms, hence the chemical formula C6H8O6. The rest follow the same pattern.
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This note was uploaded on 10/03/2011 for the course R 5A taught by Professor Fan during the Spring '08 term at Berkeley.

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207 - 207.48 The metal matrix is composed of central...

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