College Chemistry I PHS 1025 Fall 2012 Practice Exam 4B
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Which drawing below best represents hydrogen bonding methanol, CH 3OH?
1) _______
A) drawing (1)
B) drawing (2)
C) drawing (3)
2) Which is expected to have the highest surface tension at 25°?
A) C6H6
B) C3H5(OH)3
C) C2H5OH
D) drawing (4)
2) _______
D) C5H12
3) Which of the following substances has the highest boiling point?
A) CH3-CH2-CH2-CH2-CH3
B) CH3-CH2-CH3
C) Xe
3) _______
D) (CH3)4C
4) Iron crystallizes in a body-centered cubic cell having an edge length of 287 pm. What is the
density of iron in g/cm3.
A) 1.99
B) 11.9
5) Which of the following exhibits ion-dipole forces?
A) NaCl(s)
B) Na(s)
C) 15.9
D) 7.85
C) Cl2(g)
D) NaCl(aq)
4) _______
5) _______
6) Which of the intermolecular forces is the most important contributor to the high surface tension
shown by water?
A) hydrogen bonding
B) dispersion forces
C) ion-dipole forces
D) dipole-dipole forces
6) _______
7) Which of the following compounds has the highest boiling point?
A) H Cl
B) H2O
C) N H3
7) _______
D) H2S
8) Which substance in each of the following pairs is expected to have the larger dispersion forces?
8)
__
__
__
_
A) I2 in set I and isobutane in set II
B) Br2 in set I and isobutane in set II
C) I2 in set I and n-butane in set II
D) Br2 in set I and n-butane in set II
9) Nickel has a face-centered cubic structure and has a density of 8.90 g/cm3. What is its atomic
radius?
A) 249 pm
B) 353 pm
C) 125 pm
D) 997 pm
10) Which of the following compounds forms a covalent network solid?
A) O2
B) C (diamond)
C) Li
9) _______
10) ______
D) CO2
11) Which transition could occur if a solid is heated at a pressure below the triple point pressure?
A) deposition
B) sublimation
C) melting
D) condensation
11) ______
12) Which of the following compounds has the highest boiling point?
A) H3C-O-CH3
B) CH3CH2OH
12) ______
C) HOCH2CH2OH
D) CH3CH2CH2CH3
13) What is the edge length of a face-centered cubic unit cell made up of atoms having a radius of
175 pm?
A) 1400 pm
B) 700 pm
C) 495 pm
D) 247 pm
13) ______
14) Which of the following should have the largest dipole moment?
A) KCl(g)
B) CO2(g)
C) H2(g)
14) ______
15) Which has the smallest dipole-dipole forces?
A) N2
B) CH3F
16) Which drawing best represents hydrogen bonding?
D) CH3F(g)
15) ______
C) CO
D) HCl
16)
A) drawing (1)
___
___
B) drawing (2)
C) drawing (3)
D) drawing (4)
17) Which best indicates the direction of the dipole moment in acetone, (CH 3)2C=O?
A) drawing (1)
B) drawing (2)
C) drawing (3)
17) ______
D) drawing (4)
18) A supercritical fluid refers to a substance
A) at its triple point.
B) that is in the liquid crystal state.
C) with a viscosity of zero.
D) above both its critical temperature and its critical pressure.
18) ______
19) The normal boiling point for H2Te is higher than the normal boiling point for H2Se . This can
19) ______
be explained by
A) larger dipole-dipole forces, larger dispersion forces, and larger hydrogen-bond forces for
H2Te .
B) larger dipole-dipole forces for H2Te .
C) larger dispersion forces for H2Te .
D) larger hydrogen-bond forces for H2Te .
20) Which has the smallest dipole-dipole forces?
A) CH3Cl
B) HBr
20) ______
C) NO
D) O2
21) The property of a liquid that measure the liquid’s resistance to flow is
A) surface tension.
B) boiling point.
C) heat of vaporization.
D) viscosity.
21) ______
22) Molecules of a liquid can pass into the vapor phase only if the
A) vapor pressure of the liquid is high.
B) molecules have sufficient kinetic energy to overcome the intermolecular forces in the
liquid.
C) temperature of the liquid is near its boiling point.
D) liquid has little surface tension.
22) ______
23) Cesium has a radius of 272 pm and crystallizes in a body-centered cubic structure. What is the
edge length of the unit cell?
A) 314 pm
B) 544 pm
C) 628 pm
D) 385 pm
23) ______
24) The normal boiling point for HBr is higher than the normal boiling point for HCl. This can be
explained by
A) larger dipole-dipole forces, larger dispersion forces, and larger hydrogen-bond forces for
HBr.
B) larger dispersion forces for HBr.
C) larger dipole-dipole forces for HBr.
D) larger hydrogen-bond forces for HBr.
24) ______
25) Which of the following compounds exhibits only dispersion and dipole-dipole intermolecular
interactions?
A) CH3NH2
B) H2
C) CO2
D) HI
25) ______
26) Which of the following compounds has the highest boiling point?
A) NH3
B) H2S
C) HCl
26) ______
D) H2O
27) Which transition could occur if a solid is heated at a pressure above the triple point pressure?
A) condensation
B) melting
C) sublimation
D) deposition
27) ______
28) Which of the following compounds exhibits only dispersion and dipole-dipole intermolecular
interactions?
A) CO2
B) H2O
C) N2
D) HBr
28) ______
29) The magnitude of the heats of vaporization, fusion and sublimation of a substance reflect the
A) density of the substance.
B) magnitudes of the boiling and melting points of the substance.
C) strength of the intermolecular forces of the substance.
D) strength of the covalent bonds between atoms in each molecule of the substance.
29) ______
30) Rhodium has a face-centered cubic structure and has a density of 12.4 g/cm3. What is its atomic
radius?
A) 1070 pm
B) 134 pm
C) 268 pm
D) 380 pm
30) ______
31) The normal boiling point occurs when the
A) vapor pressure of a pure liquid equals an external pressure of one atmosphere.
31) ______
B) intermolecular forces within the liquid phase are broken.
C) vapor pressure of the liquid equals the external pressure.
D) temperature of the pure liquid equals the external temperature.
32) Manganese crystallizes in a body-centered cubic structure. What is the coordination number of
each atom?
A) 6
B) 12
C) 4
D) 8
32) ______
33) Which of the following molecules does not have a dipole moment?
A) HI
B) CH3CH2OH
C) C2H2
33) ______
D) H2O
34) Which of the following compounds exhibits hydrogen bonding?
A) CH3Cl
B) HI
C) NH3
D) CH3OCH3
34) ______
35) When cubic unit cells stack together, how many unit cells share a common corner?
A) 6
B) 4
C) 8
D) 2
35) ______
36) In liquid methanol, CH3OH, which intermolecular forces are present?
36) ______
A)
B)
C)
D)
Only hydrogen bonding forces are present.
Only dipole-dipole and ion-dipole forces are present.
Only dispersion and dipole-dipole forces are present.
Dispersion, hydrogen bonding and dipole-dipole forces are present.
37) Which has a dipole moment?
A) CO2
B) SO42–
37) ______
C) CO32–
38) How many atoms are in one face-centered cubic unit cell of a metal?
A) 1
B) 2
C) 3
D) SO2
38) ______
D) 4
39) How many unit cells share an atom that is on the face of a face-centered cubic unit cell?
A) 4
B) 1
C) 2
D) 8
39) ______
40) Arrange the following in order of increasing boiling point.
CH3CH2OH
CH3CH2CH3
H3C-O-CH3
40) ______
I
A) I < IV < III < II
II
B) II < III < IV < I
CH3CH2NH2
III
IV
C) IV < III < II < I
D) II < III < I < IV
41) Which best indicates the direction of the dipole moment in formaldehyde, H 2C=O?
41)
___
___
A) drawing (1)
B) drawing (2)
C) drawing (3)
D) drawing (4)
42) Which type of bonding does Sr form upon solidification?
A) molecular
B) covalent network
C) metallic
D) ionic
42) ______
43) Which of the following statements is not consistent with the properties of a molecular solid?
A) a solid that is a nonconductor of electricity
B) a low melting solid
C) a solid formed by the combination of two nonmetallic elements
D) a compound that conducts electricity when molten
43) ______
44) Which of the following forms an ionic solid?
A) S O3
B) C7H15NH2
44) ______
C) Rb I
D) Ag
45) Which is classified as an amorphous solid?
A) palladium(II) chloride
C) plastic
45) ______
B) platinum
D) phosphorus tetrachloride
46) Which of the following forms a molecular solid?
A) C10H22
B) gold
C) C(graphite)
46) ______
D) CaO
47) A certain metal crystallizes in a face-centered cubic structure. What is the edge length of the unit
cell if the atomic radius of the metal is 144 pm?
A) 407 pm
B) 288 pm
C) 333 pm
D) 204 pm
47) ______
48) Which of the following forms a molecular solid?
A) C6H4Cl2
B) copper
48) ______
C) SiO2
D) NH4NO3
49) In liquid propanol, CH3CH2CH2OH, which intermolecular forces are present?
A)
B)
C)
D)
Only hydrogen bonding forces are present.
Only dispersion and dipole-dipole forces are present.
Only dipole-dipole and ion-dipole forces are present.
Dispersion, hydrogen bonding and dipole-dipole forces are present.
49) ______
50) Which type of bonding does Mg form upon solidification?
A) molecular
B) ionic
C) metallic
D) covalent network
51) Which of the following compounds exhibits hydrogen bonding?
A) HI
B) H3C-O-CH3
C) NH3
50) ______
51) ______
D) CH3Cl
52) The critical temperature of a substance is the
A) temperature above which the compound decomposes.
B) temperature at which all three phases can exist in equilibrium.
C) temperature at which sublimation occurs.
D) highest temperature at which the liquid phase can exist in equilibrium with the gas phase.
52) ______
53) Which compound below could have a zero dipole moment?
A) CuCl2F2 (tetrahedral)
B) CCl2F2 (tetrahedral)
53) ______
C) PtCl2F2 (square planar)
D) SCl2F2 (see-saw)
54) Solids having no ordered long-range structure are classified as
A) metallic
B) molecular
C) crystalline
54) ______
D) amorphous
55) Which type of spherical packing has the most unused space?
A) cubic closest-packed and hexagonal closest-packed
B) simple cubic
C) body-centered cubic
D) cubic closest-packed
55) ______
56) An element forms a body-centered cubic crystalline substance. The edge length of the unit cell is
287 pm and the density of the crystal is 7.92 g/cm3. Calculate the atomic weight of the substance.
56) ______
A) 56.4 amu
B) 63.5 amu
C) 48.0 amu
D) 45.0 amu
57) Which of the following is most likely to have the highest viscosity at 25°C?
A) C4H10
B) C8H18
C) HOCH2CH2OH
58) Which of the following forms an ionic solid?
A) RbI
B) C7H15NH2
57) ______
D) C2H5NH2
58) ______
C) Ag
D) SO3
59) Which of the following molecules does not have a dipole moment?
A) CH3NH2
B) NH3
C) HCl
D) CH2=CH2
60) How many atoms are in one body-centered cubic unit cell of a metal?
A) 1
B) 2
C) 3
D) 4
59) ______
60) ______
61) Cesium has a radius of 272 pm and crystallizes in a face-centered cubic unit cell. What is the
edge length of the unit cell?
A) 544 pm
B) 385 pm
C) 769 pm
D) 314 pm
61) ______
62) The vapor pressure of a pure liquid increases as the
A) average kinetic energy of the molecules in the liquid phase decreases.
B) temperature of the liquid phase decreases.
C) intermolecular attractive forces increase.
62) ______
D) temperature of the liquid phase increases.
63) Which is expected to have the largest dispersion forces?
A) N2
B) CO2
C) C8H18
63) ______
D) C2H6
64) What is the edge length of a face-centered cubic unit cell made up of atoms having a radius of
128 pm?
A) 362 pm
B) 1020 pm
C) 512 pm
D) 181 pm
64) ______
65) A crystalline solid of unknown origin forms an aqueous solution that conducts an electrical
current. The solid has a high melting point and shatters when struck with a hammer. The solid is
likely to be
A) a covalent network solid.
B) an ionic solid.
C) a molecular solid.
D) a metallic solid.
65) ______
66) Lithium crystallizes in a body-centered cubic structure. What is the coordination number of each
atom?
A) 12
B) 4
C) 8
D) 6
66) ______
67) Silver crystallizes in a face-centered cubic structure. What is the edge length of the unit cell if the
atomic radius of silver is 144 pm?
A) 288 pm
B) 333 pm
C) 204 pm
D) 407 pm
67) ______
68) Which of the following compounds forms a covalent network solid?
A) SnCl4
B) SiO2
C) C8H18
68) ______
D) NO2
69) Which is expected to have the largest dispersion forces?
A) F2
B) C3H8
C) C12H26
D) Be Cl2
70) Which of the following should have the largest dipole moment?
A) BCl3(g)
B) F2(g)
C) CH3I(g)
69) ______
70) ______
D) KBr(g)
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2)
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