It's hard to tell before they are all feathered out but I would guess the top one is an EE, the second one (on the left) looks like my RIRs did at that age but could be a sex-link (Rhode Island cross), third one (second pic on right) looks like a Barred Rock or a cuckoo maran, and I'm not sure at all about the 2 chicks in the last photo. I thought maybe welsumer on the left but the coloring is not quite right.
They are all adorable!!! I bet the kids love them! I did this when I taught and it was awesome!