Chem answer check

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What shape does an ammonia (NH3) molecule have?trigonal pyramidal

In a tetrahedral molecule, how many unshared pairs of valence electrons does the central atom have? none

In a polar bond, electrons are? completely transferred

What determines the polarity of a bond? molecular shape only

What determines the polarity of a molecule?electronegativity difference only

  • Chem answer check -

    What shape does an ammonia (NH3) molecule have?trigonal pyramidal
    correct

    In a tetrahedral molecule, how many unshared pairs of valence electrons does the central atom have? none
    This answer is correct for AB4 type molecules in which the central atom has a valence of 4 and each bond has a element (in this case B) attached.

    In a polar bond, electrons are? completely transferred
    OK

    What determines the polarity of a bond? molecular shape only
    No. The polarity of a bond is determined by the electronegativity difference between the two elements forming the bond

    What determines the polarity of a molecule?electronegativity difference only
    No. The net polarity (net dipole moment) of a molecule is determined by two things:
    a. The polarity of individual bonds, AND
    b. the symmetry of the molecule.
    To have a net dipole moment, a molecule MUST have both (a) individual bond polarity AND (b)the molecule must NOT be symmetrical.

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