Iron nomenclature differences between Iron(III) and Ferric As I was doing my Ap Chem homework, sometimes the question would use Iron(III) and sometimes it would use Ferric.  What's the difference in usage?  Also, what's the difference between Iron(II) and Ferrous?
There is no difference, in both the examples you cite.  The forms Iron(II) and Iron(III) are preferred today, versus the older forms ferric and ferrous, respectively, because they more explicitly give the oxidation states of Fe, +2 and +3 in this example.