1091 Final Exam_01/13/21_(B)
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) 4 B) 0 C) 3 D) 1 E) 2
Answer: E
2) The electron domain and molecular geometry of BrO2- is __________.
A) tetrahedral, trigonal planar B) tetrahedral, bent
C) trigonal pyramidal, linear D) trigonal pyramidal, seesaw
E) trigonal planar, trigonal planar Answer: B
3) Of the following molecules, only __________ is polar.
A) BCl3 B) Cl2 C) CCl4 D) NCl3 E) BeCl2
Answer: D
4) The molecular geometry of the left-most carbon atom in the molecule below is __________.
A) trigonal bipyramidal B) tetrahedral
C) T-shaped D) octahedral
E) trigonal planar Answer: B
5) Of the following, only __________ has sp2 hybridization of the central atom.
A) CO32- B) ICl3 C) PF5 D) I3- E) PH3
Answer: A
6) The hybridization of the oxygen atom labeled y in the structure below is __________. The C-O-H bond angle is __________.
7) There are __________ σ bonds and __________ π bonds in H3C-CH2-CHCH-CH2-CCH.
A) 10, 3 B) 16, 3 C) 13, 2 D) 12, 2 E) 14, 2
Answer: B
8) Based on molecular orbital theory, there are __________ unpaired electrons in the OF+ ion.
A) 2 B) 0 C) 1/2 D) 3 E) 1
Answer: A
9) In comparing the same two atoms bonded together, the __________ the bond order, the __________ the bond length, and the __________ the bond energy.
A) greater, shorter, greater B) greater, longer, greater C) smaller, greater, greater D) greater, greater, smaller E) greater, greater, greater Answer: A
10) Based on molecular orbital theory, the bond order of the NN bond in the N22+ ion is __________.
A) 2 B) 1/2 C) 3 D) 0 E) 1
Answer: A
11) Of the following, __________ appear(s) to gain mass in a magnetic field.
B2 N2 O2
A) O2 only B) B2 and O2 C) N2 and O2 D) N2 only E) B2 and N2
Answer: B
12) Crystalline solids __________.
A) exist only at high temperatures
B) have their particles arranged randomly C) exist only at very low temperatures D) have highly ordered structures
E) are usually very soft Answer: D
13) Which one of the following substances will not have hydrogen bonding as one of its intermolecular forces?
A)
B)
C)
D)
E)
Answer: B
14) Together, liquids and solids constitute __________ phases of matter.
A) all of the B) the fluid C) the disordered D) the compressible
E) the condensed Answer: E
15) Which one of the following exhibits dipole-dipole attraction between molecules?
A) CO2 B) Cl2 C) AsH3 D) XeF4 E) BCl3
Answer: C
16) Of the following substances, only __________ has London dispersion forces as its only intermolecular force.
A) CCl4 B) CH3COOH C) PH3 D) H2O E) HF
Answer: A
18) 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) hydrogen bonding B) London dispersion force C) ion-ion
D) ion-dipole E) dipole-dipole Answer: D
19) __________ is the energy required to expand the surface area of a liquid by a unit amount of area.
A) Surface tension B) Viscosity C) Capillary action D) Meniscus
E) Volatility Answer: A
20) 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) solid
B) liquid and gas C) liquid
D) supercritical fluid E) gas
Answer: D
21) Of the following, __________ is an exothermic process.
A) melting B) boiling C) subliming D) freezing
E) All of the above are exothermic.
Answer: D
22) Of the following, __________ is the least volatile.
A) CF4 B) CH4 C) C6H14 D) CBr4 E) CCl4
Answer: D
23) The slope of a plot of the natural log of the vapor pressure of a substance versus 1/T is __________.
A) -1
ΔHvap B) ΔHvap C) 1
ΔHvap D) - ΔHvap
R E) -ΔHvap
Answer: D
24) Of the following, __________ has a slight odor of bitter almonds and is toxic.
A) N2O B) HCN C) CH4 D) CO E) NH3
Answer: B
25) Gaseous mixtures __________.
A) are all homogeneous B) can only contain molecules C) are all heterogeneous
D) can only contain isolated atoms
E) must contain both isolated atoms and molecules Answer: A
26) If one was told that their blood pressure was 130/80, their systolic pressure was __________.
A) 130 mm Hg B) 80 mm Hg C) 130 Pa D) 80 psi E) 80 Pa
Answer: A
27) "Isothermal" means __________.
A) at constant pressure B) that ΔHrxn = 0
C) at variable temperature and pressure conditions D) at ideal temperature and pressure conditions
E) at constant temperature Answer: E
28) Of the following, only __________ is impossible for an ideal gas.
A) V1T1 = V2T2 B) V1
V2 = T1 T2 C) V2 = T2
T1V1 D) V1
T1 = V2 T2 E) V1
V2 = T1 T2 = 0 Answer: A
29) Standard temperature and pressure (STP), in the context of gases, refers to __________.
A) 273.15 K and 1 torr B) 298.15 K and 1 torr C) 273.15 K and 1 atm D) 273.15 K and 1 pascal
E) 298.15 K and 1 atm Answer: C
30) The density of NO2 in a 3.50 L tank at 780.0 torr and 37.0 °C is __________ g/L.
A) 9.30 B) 1.64 C) 1.86 D) 3.27 E) 2.92
Answer: C
31) The average kinetic energy of the particles of a gas is directly proportional to __________.
A) the square root of the rms speed
32) Of the following gases, __________ will have the greatest rate of effusion at a given temperature.
A) HBr B) HCl C) NH3 D) Ar E) CH4
Answer: E
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) CsCl crystallizes in a unit cell that contains a Cs+ ion at the center of a cube and a Cl- ion at each corner.
The unit cell of CsCl is __________.
A) close packed
B) body-centered cubic C) amorphous
D) primitive cubic E) face-centered cubic Answer: B
36) The process of doping can produce a __________ which can greatly __________ intrinsic conductivity.
A) p-type semiconductor, decrease B) non-metal, increase
C) non-metal, decrease D) allotrope, diminish
E) n-type semiconductor, increase Answer: E
37) Inorganic compounds that are semiconductors have an average of __________ valence electrons.
A) 1 B) 5 C) 4 D) 2 E) 3
Answer: C
38) The formation of a condensation polymer generally involves __________.
A) the vaporization of a plasticizer B) the addition of a plasticizer
C) the formation of significant crosslinking D) the mixing of sulfur with an addition polymer
E) the elimination of a small molecule Answer: E
39) As a polymer becomes more crystalline, __________.
A) its density decreases B) its yield stress decreases C) its melting point decreases D) its stiffness decreases
E) None of the above is correct.
Answer: E
40) 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
