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Posted by on Thursday, April 29, 2010 at 3:47pm.

Identify the molecule that has polar bonds but is non-polar (net dipole moment is 0)

a. CHCl3
b. NH3
c. BCl3
d. SCl2
e. H2S

  • Chemistry - , Thursday, April 29, 2010 at 3:55pm

    You want the molecule that is symmetrical in the 3 dimensional shape. Do you know the shapes of these molecules?

  • Chemistry - , Thursday, April 29, 2010 at 4:07pm

    The molecular geometry?

    The last two are bent?, I believe. (d,e) Hydrogen can only make a single bond, right?

    Um. The first has zero lone pairs and four bonds, so it's tetrahedral, maybe. (a)

    I think the third is trigonal planar. (c)

    And the second is.... uh, like one lone pair and three bonds. So, trigonal pyramidal, then.

  • Chemistry - , Thursday, April 29, 2010 at 4:37pm

    OK. You know the shapes rather well. So a is tetrahedral; however, with 3 H and 1 Cl, it cannot be symmetrical so it will have a net dipole moment. NH3 is trigonal pyramidal (tetrahedral electronic geometry) so it will have 3 Hs and a lone pair so it will not be symmetrical and will have a net dipole moment. Following that line of reasoning, which do you think is symmetrical, which means no net dipole moment.

  • Chemistry - , Thursday, April 29, 2010 at 4:41pm

    Since the first two are bent then they will have a dipole moment, also.

    BCl3 has equally spaced bonds between its three, so that one would be symmetrical, meaning no dipole moment.

    =]

  • Chemistry - , Thursday, April 29, 2010 at 4:47pm

    Very good.

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