1 The \u03c0 bonds in graphite are localized be cause there exist many resonance

1 the π bonds in graphite are localized be cause

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1. The π bonds in graphite are localized be- cause there exist many resonance structures while the σ bonds in diamond are highly de- localized in space. 2. The energy gap is much larger for the diamond structure than for graphite. 3. The bonding in graphite results in a pla- nar structure while in diamond there is a three-dimensional system of σ bonds. 4. The π bonds in graphite are delocalized over the planar structure because there exist many resonance structures while the σ bonds in diamond formed between the sp 3 hybrids are highly localized in space. 5. Graphite absorbs visible light (it is black) while diamond absorbs only ultraviolet light (it is transparent). 006 10.0 points Which would you expect to be least viscous? 1. C 4 H 8 at 50 C 2. C 8 H 18 at 50 C 3. C 4 H 8 at 30 C 4. C 8 H 18 at 30 C 007 10.0 points Consider four molecules I) CHCl 3 II) CH 4 III) CH 3 Cl IV) CCl 4 Which of these exhibit permanent dipole- dipole interactions? 1. I, III, and IV only 2. I only 3. None of these 4. III only 5. I and III only 008 10.0 points How many tetrahedral holes are there in a face-centered cubic unit cell? 1. 12 2. 4 3. 6 4. 1 5. 8 009 10.0 points The heat of vaporization of water is 40.7 kJ/mol. The normal (1 atm) boiling point is 100 C. Using only this information, what is the vapor pressure of water at 35 C? 1. 431. torr 2. 28.0 torr 3. 4.61 torr 4. 0.0368 torr 5. 781. torr 6. 82.6 torr 7. 47.8 torr 010 10.0 points Rank the compounds CH 3 OH CH 3 CH 2 OH CH 3 CH 2 CH 2 OH in terms of increasing evaporation rate. 1. CH 3 OH < CH 3 CH 2 CH 2 OH < CH 3 CH 2 OH 2.
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kamalska (mk23835) – HW01 – Quigley – (104001) 3 CH 3 OH < CH 3 CH 2 OH < CH 3 CH 2 CH 2 OH 3. CH 3 CH 2 OH < CH 3 CH 2 CH 2 OH < CH 3 OH 4. CH 3 CH 2 CH 2 OH < CH 3 OH < CH 3 CH 2 OH 5. CH 3 CH 2 CH 2 OH < CH 3 CH 2 OH < CH 3 OH 011 10.0 points The DOMINANT intermolecular force that causes gaseous HCl molecules to attract one another is 1. None of these is dominant. 2. van der Waals. 3. ionic. 4. covalent. 5. dipole-dipole. 012 10.0 points A unit cell of one of the new high- temperature superconductors is shown here. Y (at outside corners of the cell) Ba (at inside corners of smaller cubes) O (at face centers of smaller cubes) Cu (at centers of smaller cubes). All atoms are on the surface of the unit cell except for the copper atoms and two of the oxygen atoms. What is its empirical formula?
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  • Fall '08
  • QUIGLEY
  • Crystal, Intermolecular force, O H C H H C H O C H H C H H C H H C H H C H H C H H C H H C H H C H H C H H C H H C H H C H H C H H C H H C H H O C H H O

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