Marty Turco, who will start the season as Chicago's new No. 1 goalie, stopped 20 shots. One of the NHL's most-active puckhandling goalies, Turco helped set up Toews' goal with a long pass, but also enabled Hensick's with a giveaway.
The Blackhawks lineup included nearly all of their regulars. Chicago had 25 players on its roster Sunday; NHL teams must trim down to 23 this week.
Blackhawks defenseman Brian Campbell, who suffered a right knee sprain against Pittsburgh on Friday, didn't skate on Sunday and will miss four to five weeks. Niklas Hjalmarsson, Campbell's defense partner for most of last season, was paired with 19-year-old rookie Nick Leddy.
Cross Checks Blog
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After a scoreless first period, the Blackhawks opened a 4-1 lead in the second, scoring their first three goals on consecutive shots.
Kopecky's power-play goal score, a deflection of Duncan Keith's shot from the point opened the scoring at 8:43 of the second. Brouwer made it 2-0 just over 3 minutes later when he connected from the front of the net after Jake Dowell forced a Blues turnover.
Hossa deflected in a shot by rookie Jeremy Morin for a power-play goal with 6:55 left in the period. Crombeen cut it to 3-1 with 3:02 to go in the second by lofting in a rebound.
Toews replied 38 seconds later, completing a rush that was set up by Turco's long pass from near his own crease to center ice.
Turco's giveaway set up Hensick's goal at 1:51 of the third that cut it to 4-2. Behind the net, the goalie dished the puck right on to the stick of Brad Winchester, who fed Hensick in front of the goal.
Berglund complete the scoring with 2:09 left.
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Arena: United Center Location: Chicago, Illinois
Referees: Brian Pochmara, Steve Kozari Linesmen: Bryan Pancich, Scott Cherrey
Attendance: 19,692 (99.9% full)
No scoring this period
Tomas Kopecky 2 (power play) Assist: Duncan Keith, Jonathan Toews
Troy Brouwer 1 Assist: Viktor Stalberg, Jake Dowell
Marian Hossa 4 (power play) Assist: Jeremy Morin, Brent Seabrook
B.J. Crombeen 2 Assist: Jay McClement, Dean Arsene
Jonathan Toews 2 (power play) Assist: Tomas Kopecky, Patrick Kane
T.J. Hensick 1 Assist: Brad Winchester
Patrik Berglund 2 Assist: Nathan Oystrick, Alex Steen