You
should not be looking at these answers unless you have already worked the
entire practice exam using only a pencil, calculator, and periodic table,
allowing 50 min of time (2 hours for the final).
Completely
blank problems on your practice exam indicate uncertainties you have with some
of the course material, and you should see me during office time to receive
help.
Looking
at the answers before you work the practice test is a poor indicator of your
knowledge and likely performance on the actual exam.