although many of these are too far to tell for sure-
Top - from left to right-
1. Definitley looks like Cercis canadensis
2. Probably Fagus grandifolia(not flora)
3. This is a toss up between Quercus alba and Quercus macrocarpa.
Buds would tell for certain.
4. IF this is the entire leaf, then most likely Robinia psuedoacacia.
It could also be a portion of a leaf from Gymnocladus dioicus, but the
leaflets look more like Robinia

bottom- left to right-
5. Defnitely Liriodendron tulipifera
6. A quercus that nobody in the world could guess without a twig
sample, maybe Q. rubra, but is absolutley not the aforementioned Q.
robur.
7. (in the middle) Looks like Celtis occidentalis. It maybe one of
the smaller leaved Ulmus, but the pic is to blurry to see the leaf
bases.
8. Probably just plain old Acer rubrum, but its hard to tell if the
petiole is red.


Hope this helps. Leaves alone are rarely enough to identify a species
even to the trained professional. Twig samples are often more helpful
in identification.

Toad