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difference between shape and geometery

Discussion in 'MCAT Discussions' started by lookleft, Apr 15, 2004.

  1. lookleft

    lookleft Member
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    Does anyone know the difference between geometery and shape.

    Thanks
     
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  3. Dr_Jay_wannabe

    Dr_Jay_wannabe Junior Member
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    I believe that GEOMETRY refers to the lewis structure without considering lone pair electrons. SHAPE refers to the three-dimensional structure with lone pair electrons included (all the orbitals). For example, the GEOMETRY of water is bent (because the electrons don't count for the GEOMETRY) and the SHAPE is tetrahedral (electron lone pairs are included).

    Hope that helps.

    Dr_Jay_Wannabe
     
  4. mynamehere

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    bumping to clarify my confusion . ..

    SHAPE = geometry without the effects of electrons?

    in one of the kaplan questions, it asks what the SHAPE of SO2 is (providing information that it exhibits dipole-dipole interaction). the answer was BENT.. isn't this the geometry, not the shape?
     
  5. Raisins4Sunday

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    Yes, that's absolutely right.

    Even though the geometry of the SP3 orbitals are all tetrahedral, the shape of the molecule refers to the orientation of the atoms:
    CH4 - Tetrahedral
    NH3 - Trigonal pyramidal
    H2O - Bent

    The shape of the molecule will be its geometry when it has no lone pairs.
     

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