Homework Solutions

October 9

Chapter 14

11.    45a.    linear is sp

    45b.    trigonal pyramidal means tetrahedral including lone pair; sp³

    45c.    sp³
    45d.    sp³
    45e.    sp²
    45f.    sp³
    45g.    sp
    45h.    both oxygens are sp²
    45i.    Br is probably sp³

    48a.    NO₂^- is sp²

            NO₃^- is sp²

    48b.    central atom is sp for all three

14a.    sulfur dioxide is bent, with one lone pair, bond angle is a bit less than 120 deg.; hybridization is sp2.

    b.    sulfur trioxide is trigonal planar, with double bonds between the sulfur and all three oxygens.  Bond angles are all 120 deg.

    c.    thiosulfate is tetrahedral, with double bonds between the two sulfurs and between the central sulfur and one of the oxygens.  There are three resonance structures, so we know this is a very stable compound.  Bond angle is 109.5 deg

    d.    This ion is tetrahedral around the sulfurs and bent around the oxygens.  The OSO bond angles are 109.5 while the SOO and OOS bond angles are a bit less.  Two of the oxygens bonded only to sulfur are so bound by double bonds, for a total of four double bonds.  There are four resonance structures.

    e.    The sulfite ion is a trigonal pyramid.  There are three resonance structures each involving two single SO bonds and one double SO bond.  There is a lone pair on the sulfur.  OSO bond angles are somewhat less than 109.5 deg.