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my teacher told me that polar bonds have a difference in elecronegativities of .4-2.1

is that the only way to find if a bond is polar?

also how would you find out if the MOLECULE is polar or not?
- i think i remember my teacher saying something about dipole moments...

  • chemistry -

    To be polar, a molecule must have both of the following:
    a. bonds that are polar AND
    b. the molecule must NOT be symmetrical.

    Electronegativity is the way to go to determine if a bond is polar.

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