Glendening scored short-handed on a 2-on-1 break with Ty Dellandrea to extend the lead to 4-0 at 7:04 of the third period.
Johnson scored on a rebound at the top of the crease at 10:33 for the 4-1 final, his first goal since Feb. 27 (15 games).
"Obviously it's been a tough stretch, but [I] would rather score when it actually matters, so I don't really care, to be honest with you," Johnson said. "It's been pretty difficult, obviously. It's tough all the way around. You're not getting the results. The road trip we were on (1-4-0 from March 16-25), it just kind of seems like everything is just building up and you have a lot on your shoulders right now, but we've got to relax a little bit. Instead of getting upset and mad, you kind of have to just find it within each other to play for each other and be happy and make things a little bit more fun."
NOTES: Blackhawks defenseman Alex Vlasic had two shots in 19:53 in his season debut after being recalled from Rockford of the American Hockey League on Monday. … Chicago defenseman Wyatt Kaiser had an assist, his first NHL point in his fourth NHL game. … Blackhawks captain Jonathan Toews took part in the morning skate. He has not played since Jan. 28 and announced Feb. 21 he was stepping away to deal with effects of long COVID-19 and Chronic Immune Response Syndrome, which kept him out the entire 2020-21 season.