1 is an Easter-egger
2 could be a few things... Do you know which hatchery your feed store got them through? Splash Marans is certainly possible, though I think they usually have slate legs.
3 is an Easter-egger
4 is an Easter-egger
5 is a Light Brahma
7 is a Lavender Orpington
8 is a Blue Laced Red Wyandotte. She has the incorrect comb for her breed, but it happens sometimes with Wyandottes.
I didn't see a 6 in your pictures--let me know if I missed one!