Go to your local tire, and wheel shop. Most of the afterarket wheel companies make adapters, that will adapt different wheels, than a car, or truck require. I don't know about your situation, for sure.
5lug by 4.5 inch spacing 5lug by 4.5 inch spacing
NO.
yes
7/16-20
Well it really depends which scion you're talking about. Most Acura Rims are 5lug 115mm bolt pattern but everything except the Scion TC are 5lug with 4" (or 100mm) bolt pattern so they definitely not fit. For starters I'd find out what your lug pattern is, you find find it by going to places like http://www.originalwheels.com/acura-wheels/index.php to find the sizes of the acura rims you're looking to swap with the scion rims.
NO, Chevy car and truck rims will not interchange.
No.
No.
No
No. The Chevy pattern is larger.No. The Chevy pattern is larger.
NO.
YES, there the same wheel.