Chevrolet 2010 Impala Owner's Manual page 348

If needed, use the flat end of the wheel wrench and pry
along the edge of the cover until it comes off. The edge of
the wheel cover could be sharp, so do not try to remove it
with your bare hands. Do not drop the cover or lay it face
down, as it could become scratched or damaged. Store
the wheel cover in the trunk until the flat tire is repaired or
replaced.
Once you have removed the wheel cover, use the
following procedure to remove the flat tire and install the
spare tire.
1. Do a safety check before proceeding. See Changing
a Flat Tire on page 6-75
6-78
2. Turn the wheel wrench counterclockwise once on
each wheel nut to loosen them. Do not remove
them yet.