5 Steps to a 5 AP Chemistry

AP Chemistry Practice Exam 2  331

39.The 4s orbital fills before the 3d.

40.Which of the following does not have one or
more πbonds?

(A) HNO 2

(B) N 2

(C) N 2 H 4

(D) HNO 3

(E) N 2 H 2

For questions 41 and 42, pick the best choice from
the following:

(A) ionic bonds

(B) hybrid orbitals

(C) resonance structures

(D) hydrogen bonding

(E) van der Waals attractions

41.The unusually high melting point of hydrogen
fluoride is due to this.

42.Their presence explains why the bonds in BF 3 are
all the same.

43.Which of the following has more than one
unshared pair of valence electrons on the central
atom?

(A) NH 2

(B) N 2 O 5

(C) NH 3

(D) NO 2

(E) NO 3

44.Which types of hybridization of carbon are in the
compound propane, CH 3 CH 2 CH 3?

I. sp^3

II. sp^2

III. sp

(A) I only

(B) II and III

(C) I, II, and III

(D) II only

(E) I and II

45.The approximate boiling points for hydrogen

compounds of some of the elements in the

nitrogen family are: (SbH 3 15 °C), (AsH 3

–62°C), (PH 3 –87°C), and (NH 3 , –33°C). The

best explanation for the fact that NH 3 does not

follow the trend of the other hydrogen com-

pounds is

(A) NH 3 is the only one that is nearly ideal in the

gas phase.

(B) NH 3 is the only one that is a base.

(C) NH 3 is the only one that is water-soluble.

(D) NH 3 is the only one to exhibit hydrogen

bonding.

(E) NH 3 is the only one that is nonpolar.

Choose the appropriate answer from the following

list for questions 46 and 47.

(A) London dispersion forces

(B) covalent bonding

(C) hydrogen bonding

(D) metallic bonding

(E) ionic bonding

46.This is why copper is ductile.

47.This is why acetic acid molecules exist as dimers

in the gaseous phase.

48.Which of the following best explains why

1-butanol, CH 3 CH 2 CH 2 CH 2 OH, has a higher

boiling point (117°C) than its isomer, methyl

propyl ether, CH 3 OCH 2 CH 2 CH 3 (39°C)?

(A) the lack of hydrogen bonding in 1-butanol

(B) the presence of hydrogen bonding in

1-butanol

(C) the higher molecular mass of 1-butanol

(D) the lower specific heat of 1-butanol

(E) the higher density of 1-butanol

49.What additional information is needed to con-

vert the molality of a 1.00 m Na 2 SO 4 solution to

the molarity?

(A) the volume of the solution

(B) the density of the solution

(C) the boiling point of the solution

(D) the osmotic pressure of the solution

(E) the mass of the solution

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