Okay, here we go(these chicks are still pretty young, but you do have a couple of obvious cockerels)
First pic is a male barred Plymouth Rock.
Second pic has the feathering of a female but the comb of a male, it is also a barred Plymouth Rock(just wait and see with this one)
Third pic is a female white Leghorn or white Plymouth Rock
Fourth pic is male white Leghorn or white Plymouth Rock
Fifth pic is a male white Leghorn or white Plymouth Rock
Sixth pic is a female, not sure of breed
Seventh pic looks to be a male Silkie mix, or some other breed with pure black/blue skin
Hopefully this was helpful.