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Atkins' Physical Chemistry | 11th Edition | ISBN: 9780198769866 | Authors: Atkins, Peter; De Paula, Julio; Keeler, James ISBN: 9780198769866 2042

Solution for problem D11D.1 Chapter 11D

Atkins' Physical Chemistry | 11th Edition

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Atkins' Physical Chemistry | 11th Edition | ISBN: 9780198769866 | Authors: Atkins, Peter; De Paula, Julio; Keeler, James

Atkins' Physical Chemistry | 11th Edition

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Problem D11D.1

Describe the physical origin of the gross selection rule for infrared pectroscopy.

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Notes Week 24-28 Friday, October 21, 2016 7:26 PM 11.3 Continued: • Dispersion Force (London force): intermolecularforce present in all moleculesand atoms ○ Result of fluctuations in the electrondistribution within moleculesor atoms. ○ Electrons in an atom or molecule may at any instant be unequally distributed ○ The magnitude of the dispersion force depends on how easily the electrons in the atom or moleculecan move or polarize in response to an instantaneousdipole.  Larger electron cloud results in larger dispersion force  If all other factors are constant, dispersion force increaseswith molar mass  Shape of molecule can also have impact on dispersion force □ Longer molecules have greater dispersion because there's more area for contact betweenmolecules □ Small or round moleculeshave lower dispersion because there's smaller area for contact  Boiling point is a reflection of how great dispersion forces are □ Greater the dispersion, higher the boiling point □ Lower the dispersion, lower the boiling point • Dipole-Dipole Force: existsin all moleculesthat are polar ○ Polar molecules have electron compacted regions and electronlacking regions, resulting in permanently charged regions ○ Polar molecules have higher melting and boiling points than nonpolar moleculesof similar molar mass.

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Chapter 11D, Problem D11D.1 is Solved
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Textbook: Atkins' Physical Chemistry
Edition: 11
Author: Atkins, Peter; De Paula, Julio; Keeler, James
ISBN: 9780198769866

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