has Simple Leaves; one single leaf attaches to the petiole

Oak {Quercus sp.};  bears acorns- the “nut with a hat” /  Maple {Acer sp.}, Sycamore {Platanus sp.}, OR Similar-Shaped Leaves / Spade-Shaped Leaves / Arrowhead-Shaped Leaves / Lance-Shaped Leaves

has Compound Leaves– several “leaflets” divide from one petiole

View both a Simple & Compound Leaf here.

Sources:

Wikipedia on Maple:  http://en.wikipedia.org/wiki/Maple

Photos for {Acer sp.) from Sugar Maple profile on USDA.gov:  http://plants.usda.gov/core/profile?symbol=ACSA3

Other Photos & Database Entry: Distance Everheart 7-25-13, 10-24-14