Predicting Polarity: Molecule Dipole Moment Questions

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SUMMARY

The discussion focuses on identifying polar and nonpolar molecules based on their dipole moments. A molecule is classified as polar if the center of charge does not align with the center of the molecule, while nonpolar molecules, such as CH4 and CF4, exhibit symmetry that allows charge cancellation. The example of the polar molecule OH is highlighted, where oxygen's higher electronegativity causes an uneven distribution of electron density. Drawing molecular configurations is emphasized as a practical tool for understanding these concepts.

PREREQUISITES
  • Understanding of molecular geometry and symmetry
  • Knowledge of electronegativity and its effects on molecular polarity
  • Familiarity with dipole moments and their significance
  • Ability to draw and interpret molecular structures
NEXT STEPS
  • Study the concept of electronegativity in detail, focusing on periodic trends
  • Learn how to calculate dipole moments for various molecules
  • Explore molecular geometry using VSEPR theory
  • Practice drawing Lewis structures to visualize molecular polarity
USEFUL FOR

Chemistry students, educators, and anyone interested in molecular structure and polarity analysis will benefit from this discussion.

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how do i tell when a molecue is poler... i know its when it was dipole moment that do not cancel each other... but how do i know when a molecule had dipole moments... this one is really stunmping me...nad about all thses questions... no I am not reading them off a list... this is a few moths of questiones on summer work i dident understand stored up
 
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The molecule is polar if the center of charge does not coincide with the center of the molecule. Usually nonpolar molecules are symmetric in shape, for example CH4 and CF4 are non polar because all four hydrogens and flouride's charge cancel each other out. An example of a polar molecule for example is OH, since oxygen is much more electronegative than hydrogen, it pulls the electrons closer to it and the center of charge is shifted a bit more to the oxygen.

Drawing the molecular configuration helps a lot in these problems.

The very primitive 80% rule, if its symmetric, its nonpolar.
 
thank you- great help

yes...i get it!
 

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