Chain control for passenger vehicles is almost non existent on I70. In fact it's almost non existent for the state. It's on the books, and I've ran into it once in 21 years of living out here.
One thing about your Friday return, keep in mind traffic out of the mountains should be a breeze. Traffic in Denver, could be a bitch. Especially if you are leaving during rush hours times. Hopefully your flight out is mid morning. Driving through the metro after 9 is a whole lot better than better than driving through at 7 or 8.