Barely. As in you're seriously pushing it. Thats a a drive of an hour and 1/2 during no traffic hours. Middle of the day it'll take much longer because traffic here can get nasty
I think your best bet is metra, that way you'll only have grab a taxi to get to the metra from the chicago campus, change trains once and not get caught in traffic, and then its a 5 minute walk from the metra to the south end of NU's campus... assuming thats where your class is.... but its a pricy option.
There's also a free bus that runs from evanston campus to the Law school (down town right behind water tower), and odds are there's some sort of U chicago shuttle between the main campus and the business school which is very close to NU's law school (like a 10 minute walk). But you'll have to change the busses, walk between them and hope that neither gets caught in traffic