Dipole Dipole and Lewis Dot structes

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SUMMARY

The discussion centers on the molecular structure and dipole interactions of hydrogen peroxide (H2O2). It is established that H2O2 does not exhibit dipole-dipole forces due to the cancellation of its component dipole moments, resulting in no net dipole moment. The Lewis structure of H2O2 reflects this cancellation, as the antiparallel dipole moments of the hydroxyl groups negate each other. The analysis emphasizes the importance of considering formal charge and the typical valence of oxygen atoms in understanding molecular geometry.

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  • Understanding of molecular polarity and dipole moments
  • Familiarity with Lewis dot structures
  • Knowledge of formal charge calculations
  • Basic principles of vector addition in chemistry
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  • Study the molecular geometry of hydrogen peroxide (H2O2) using VSEPR theory
  • Learn about the properties and implications of dipole-dipole interactions in polar molecules
  • Explore the concept of formal charge in greater detail, particularly for oxygen-containing compounds
  • Investigate the differences between polar and nonpolar molecules, using examples like CO2 and H2O2
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undertow
Why doesn't HOOH dipole dipole forces?

I read that if a molecule has an Oxygen atom, it's likely to have dipole forces. This one only has Dispersion forces.

Also, why does the Lewis structure of this molecule NOT look like this:

th_b0d_untitled.JPG
 
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Because the dipoles cancel out. (e.g., CO_2 is nonpolar, but contains polar bonds).

The component dipole moments of H_2O_2 simply cancel out, and it has no net dipole moment.
You see, hydroxyl groups contain a partially positively charged hydrogen and a partially negatively charged oxygen.

Draw the direction of each dipole moment, and you will have two antiparallel H -|--> O equal in magnitude but opposite in direction (as vectors). As in vector addition, these two dipole moments will cancel each other out (you have a zero vector for net dipole).
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undertow said:
Also, why does the Lewis structure of this molecule NOT look like this:
http://img111.imagevenue.com/loc276/th_b0d_untitled.JPG

Consider formal charge, and the usual valence of oxygen atoms. (http://www.westga.edu/~chem/courses/chem1212slattery/contents/chapter8-all/img031.gif )
(Hint: Oxygen | 1 s ^2 2 s^2 2 p^4 )
 
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