328 ❯ STEP 5. Build Your Test-Taking Confidence- C—All three compounds are capable of hydro-
gen bonding; therefore, this cannot be the cause
of difference. In general, all other things being
equal, it takes less energy to move a lighter mol-
ecule from the liquid state to the gaseous state.
CH 3 CH 3O H O
C C
O H O- D—Strong hydrogen bonds hold two molecules
of acetic acid together. Ideal gases have no inter-
molecular forces. Therefore, the ideal gas law
used in experiment is invalid.
60. C—Increasing ionization energy applies to an
element higher in a column on the periodic
table, or in a position further to the left in a
period on the periodic table. Note, this type
of explanation is unacceptable on the Free
Response portion of the AP Exam, where your
explanation would require information on radii
and effective nuclear charges.
20-Moore_PE01_p307-340.indd 328 31/05/18 1:58 pm