1061-3rd Chem Exam-1070110(A)
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1)ClF3 has "T-shaped" geometry. There are __________ non-bonding domains in this molecule.
A) 1 B) 3 C) 4 D) 2 E) 0
Answer: D
2) The hybridization of the oxygen atom labeled y in the structure below is __________. The C-O-H bond angle is __________.
A) sp3d2, 90° B) sp, 90° C) sp2, 109.5° D) sp3, 109.5° E) sp, 180°
Answer: D
3)There are __________ bonds and __________ bonds in H3C-CH2-CH CH-CH2-C CH.
A) 10, 3 B) 12, 2 C) 14, 2 D) 13, 2 E) 16, 3
Answer: E
4) The O-C-O bond angle in the CO32- ion is approximately __________.
A) 109.5° B) 60° C) 120° D) 180° E) 90°
Answer: C
5) The molecular geometry of the left-most carbon atom in the molecule below is __________.
A) octahedral
B) trigonal bipyramidal C) trigonal planar D) tetrahedral
E) T-shaped Answer: D
6) The bond angles marked a, b, and c in the molecule below are about __________, __________, and __________, respectively.
A) 120°, 109.5°, 120°
B) 90°, 180°, 90°
C) 109.5°, 109.5°, 109.5°
D) 109.5°, 109.5°, 90°
E) 109.5°, 109.5°, 120°
Answer: E
7) Of the molecules below, only __________ is polar.
A)CH4 B)SeF4 C)SiCl4 D)CCl4
Answer: B
8) The hybridization of nitrogen in the H C N: molecule is __________.
A) sp2 B) sp C) s2p D) s3p E) sp3
Answer: B
9) In comparing the same two atoms bonded together, the __________ the bond order, the __________ the bond length, and the __________ the bond energy.
A) smaller, greater, greater B) greater, greater, greater C) greater, longer, greater D) smaller, longer, smaller
E) greater, shorter, greater Answer: D, E
10)Based on molecular orbital theory, the bond order of the C C bond in the C2 molecule is __________.
A) 0 B) 1 C) 2 D) 3 E) 4
Answer: C
11) Based on molecular orbital theory, there are __________ unpaired electrons in the OF+ ion.
A) 1/2 B) 1 C) 2 D) 3 E) 0
Answer: C
12) Of the following, __________ has a slight odor of bitter almonds and is toxic.
A) CO B) HCN C)N2O D)NH3 E)CH4
Answer: B
14) The volume of a sample of gas (2.49 g) was 752 mL at 1.98 atm and 62 °C. The gas is __________.
A)NH3 B)NO2 C)SO3 D)SO2 E) Ne
Answer: B
15) 10.0 grams of argon and 20.0 grams of neon are placed in a 1200.0 ml container at 25.0 °C. The partial pressure of neon is __________ atm. (atomic mass of argon is 39.948; atomic mass of neon is 20.180)
A) 8.70 B) 5.60 C) 20.4 D) 0.700 E) 3.40
Answer: C
16) Which of the following equations shows an incorrect relationship between pressures given in terms of different units?
A) 1.0 torr = 2.00 mm Hg B) 1.00 atm = 760 torr C) 1.20 atm = 122 kPa
D) 152 mm Hg = 2.03 × 104 Pa E) 0.760 atm = 578 mm Hg Answer: A
17) The pressure exerted by a column of liquid is equal to the product of the height of the column times the gravitational constant times the density of the liquid, P = ghd. How high a column of methanol (d = 0.79 g/mL) would be supported by a pressure that supports a 713 mm column of mercury (d = 13.6 g/mL)?
A) 713 mm B) 9.7 × 103 mm C) 1.2 × 104 mm D) 17 mm
E) 41 mm Answer: C
18) According to kinetic-molecular theory, in which of the following gases will the root-mean-square speed of the molecules be the highest at 200 °C?
A) HCl B)SF6 C)H2O D)Cl2
E) None. The molecules of all gases have the same root-mean-square speed at any given temperature.
Answer: C
19) At 333 K, which of the pairs of gases below would have the most nearly identical rates of effusion?
A)N2O and NO2 B)CO and CO2 C)CO and N2 D)NO2 and N2O4
E)N2 and O2 Answer: C
20) A real gas will behave most like an ideal gas under conditions of __________.
A) low temperature and low pressure B) high temperature and high pressure C) low temperature and high pressure D) STP
E) high temperature and low pressure Answer: E
21) Which one of the following gases would deviate the least from ideal gas behavior?
A) Kr B) Ne C)CO2 D)F2 E)CH3Cl
Answer: B
22) Of the following substances, only __________ has London dispersion forces as its only intermolecular force.
A)CH3OH B) HCl C)CH4 D)NH3 E)H2S
Answer: C
23) Of the following substances, __________ has the highest boiling point.
A)CO2 B)NH3 C) Kr D)CH4 E)H2O
Answer: E
24) When NaCl dissolves in water, aqueous Na+ and Cl- ions result. The force of attraction that exists between Na+
and H2O is called a(n) __________ interaction.
A) ion-dipole B) dipole-dipole
C) London dispersion force D) ion-ion
E) hydrogen bonding Answer: A
25) As a solid element melts, the atoms become __________ and they have __________ attraction for one another.
A) larger, greater B) more separated, less C) closer together, less D) more separated, more
E) closer together, more Answer: B
26) Heat of sublimation can be approximated by adding together __________ and __________.
A) heat of fusion, heat of vaporization
B) heat of freezing (solidification), heat of condensation C) heat of freezing (solidification), heat of vaporization D) heat of fusion, heat of condensation
E) heat of deposition, heat of vaporization Answer: A
27) Based on the following information, which compound has the strongest intermolecular forces?
Substance Hvap (kJ/mol)
Argon (Ar) 6.3
Benzene (C6H6) 31.0
Ethanol (C2H5OH) 39.3
Water (H2O) 40.8
Methane (CH4) 9.2
A) Methane B) Ethanol C) Benzene D) Water E) Argon
Answer: D
28) Which one of the following exhibits dipole-dipole attraction between molecules?
A)BCl3 B)Cl2 C)AsH3 D)XeF4 E)CO2
Answer: C
29) Which of the following is most likely to exhibit liquid-crystalline behavior?
A)
B)
C)CH3CH2-C(CH3)2-CH2CH3
D) CH3CH2CH2CH2CH2- Na+
E)CH3CH2CH2CH2CH2CH2CH2CH3 Answer: B
30) Which one of the following substances will have hydrogen bonding as one of its intermolecular forces?
A)
B)
C)
D)
E)
Answer: B
31) __________ is the energy required to expand the surface area of a liquid by a unit amount of area.
A) Viscosity B) Capillary action C) Volatility D) Meniscus
E) Surface tension Answer: E
32)The critical temperature and pressure of CS2 are 279 °C and 78 atm, respectively. At temperatures above 279°C and pressures above 78 atm, CS2 can only occur as a __________.
A) liquid B) solid
C) liquid and gas D) supercritical fluid
E) gas Answer: D
33) Which of the following is not a type of solid?
A) supercritical B) metallic
C) covalent-network D) molecular
E) ionic Answer: A
34) The scattering of light waves upon passing through a narrow slit is called __________.
A) diffusion B) incidence C) adhesion D) grating E) diffraction
Answer: E
35) Heterogeneous alloys
A) have properties that depend on the manner in which the melt is solidified.
B) have properties that depend on composition.
C) have properties that depend on the manner in which the solid is formed.
D) All of the above are true.
Answer: C
36) Of the following, only __________ is not a polymer.
A) protein B) cellulose C) stainless steel D) nylon
E) starch Answer: C
37) Which of the following is not classified as a nanomaterial?
A) carbon nanotubes B) isoprene
C) buckminsterfullerene D) graphene
E) All of the above are classified as nanomaterials Answer: B
38) If the electronic structure of a solid substance consists of a valence band that is completely filled with electrons and there is a large energy gap to the next set of orbitals, then this substance will be a(n) __________.
A) semiconductor B) nonmetal C) insulator D) alloy
E) conductor Answer: C
39) NaCl crystallizes in a face-centered cubic cell. What is the total number of ions (Na+ ions and Cl- ions) that lie within a unit cell of NaCl?
A) 5 B) 4 C) 6 D) 2 E) 8
Answer: E
40) Inorganic compounds that are semiconductors have an average of __________ valence electrons.
A) 4 B) 1 C) 5 D) 2 E) 3
Answer: A
