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How can you tell if a molecule is polar or nonpolar

  1. Oct 20, 2014 #1

    for octane (C8H18), how can you tell whether or not it is polar or non-polar without drawing a lewis structure diagram? also, if you absolutely need to draw one, what is the easiest way to go about drawing a more advanced molecule like octane? I can draw simple molecules and find their shapes, i.e. planar triangles, etc, but I get lost when faced with bigger ones.

    thank you
  2. jcsd
  3. Oct 20, 2014 #2


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    Staff: Mentor

    Alkanes are non-polar almost by definition.
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