Chem 065 - Introductory General Chemistry » Winter 2024 » Practice IMF and Phase Change
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Question #1
Evaporation is:
A.
increased by increasing temperature.
B.
an endothermic process.
C.
the opposite process to condensation.
D.
all of these
E.
a cooling process for humans when they sweat.
Question #2
Which of the following statements is false?
A.
As a liquid is converted into a gas, the liquid absorbs heat.
B.
Evaporation is an endothermic process.
C.
all of these
D.
none of these
E.
A puddle of water cools down as it evaporates.
Question #3
The opposite process of freezing is:
A.
condensation.
B.
none of these
C.
sublimation.
D.
boiling.
E.
evaporation.
Question #4
The amount of heat required to melt one mole of a solid is called the:
A.
heat of vaporization.
B.
cooling curve.
C.
heat of fusion.
D.
heating curve.
E.
none of these
Question #5
Which state of matter has a high density and an indefinite shape?
A.
liquids
B.
both solids and liquids
C.
none of these
D.
solids
E.
gases
Question #6
When you make ice cubes:
A.
none of these
B.
the heat of vaporization must be removed.
C.
the process is referred to scientifically as sublimation.
D.
it is an endothermic process.
E.
it is an exothermic process.
Question #7
Which statement is TRUE in describing what occurs when a solid melts to a liquid?
A.
The process is exothermic and the heat of fusion is negative.
B.
not enough information
C.
The process is endothermic and the heat of fusion is negative.
D.
The process is exothermic and the heat of fusion is positive.
E.
The process is endothermic and the heat of fusion is positive.
Question #8
Gaseous water vapor can frost the windows of a car on a cold morning. This process of a gas changing directly into a solid is known as:
A.
melting.
B.
condensation.
C.
deposition.
D.
sublimation.
E.
none of these
Question #9
Which state of matter has a high density and a definite volume?
A.
solids
B.
none of these
C.
both solids and liquids
D.
gases
E.
liquids
Question #10
Paradichlorobenzene, a material used in "moth balls," is known to go directly from a solid form to a gaseous form. This process is known as:
A.
condensation
B.
sublimation
C.
melting
D.
evaporation
E.
boiling
Question #11
Which intermolecular force is present in all molecules and atoms?
A.
dispersion forces
B.
none of these
C.
dipole-dipole forces
D.
X-forces
E.
hydrogen bonding
Question #12
Which intermolecular force is due to the formation of an instantaneous dipole?
A.
none of these
B.
dipole-dipole forces
C.
hydrogen bonding
D.
X-forces
E.
dispersion forces
Question #13
Which substance below has dipole-dipole forces?
A.
F2
B.
CH4
C.
CO2
D.
none of these
E.
H2S
Question #14
Which intermolecular force increases with increasing molar mass?
A.
hydrogen bonding
B.
dispersion forces
C.
none of these
D.
dipole-dipole forces
E.
X-forces
Question #15
Which noble gas has the highest boiling point?
A.
He
B.
Ar
C.
Xe
D.
Ne
E.
Kr
Question #16
Which state of matter has a low density and an indefinite volume?
A.
liquids
B.
gases
C.
solids
D.
both solids and liquids
E.
none of these
Question #17
Assuming that the molecules carbon monoxide (CO) and nitrogen (N2) have similar electron clouds, which statement below is TRUE?
A.
Both CO and N2 must have the same boiling point.
B.
N2 has the higher boiling point because it experiences dipole-dipole forces.
C.
none of these
D.
CO has the higher boiling point because it experiences dipole-dipole forces.
E.
The N2 has the higher boiling point because it has greater dispersion forces.
Question #18
Which intermolecular force is common to all polar molecules but NOT nonpolar molecules?
A.
hydrogen bonding
B.
dipole-dipole forces
C.
none of these
D.
X-forces
E.
dispersion forces
Question #19
Substance A is a molecular compound that dissolves in gasoline but not in water. The molecules of A are very likely:
A.
polar.
B.
nonmetallic.
C.
none of these
D.
nonpolar.
E.
metallic.
Question #20
Which substance is most likely to be miscible with water?
A.
Br2
B.
CS2
C.
CHCl3
D.
CF4
E.
none of these
Question #21
Which statement below is false?
A.
none of these
B.
A hydrogen bond is the strongest of the intermolecular forces.
C.
The large electronegativity difference between hydrogen and an F, O, or N atom is essential for the formation of a hydrogen bond.
D.
A hydrogen bond is only 2-5% the strength of a typical covalent bond.
E.
A hydrogen atom must be bonded directly to fluorine, oxygen, or nitrogen to exhibit hydrogen bonding.
Question #22
Which molecule below has hydrogen bonding?
A.
HCl
B.
H2
C.
CH3CH2OH
D.
all of these
E.
CH4
Question #23
Which molecule below has hydrogen bonding?
A.
H2O
B.
NH3
C.
all of these
D.
CH3OH
E.
HF
Question #24
Which intermolecular forces are found in CCl4?
A.
none of these
B.
dipole-dipole forces
C.
hydrogen bonding
D.
dispersion forces
E.
X-forces
Question #25
Which state of matter has a low density and is easily compressed?
A.
both solids and liquids
B.
none of these
C.
liquids
D.
solids
E.
gases
Question #26
Which intermolecular forces are found in CO2?
A.
none of these
B.
hydrogen bonding
C.
dipole-dipole forces
D.
dispersion forces
E.
dispersion forces and dipole-dipole forces
Question #27
What types of forces exist between I2 molecules?
A.
ion-dipole forces
B.
dispersion forces
C.
hydrogen bonding
D.
none of these
E.
dipole-dipole forces
Question #28
Which intermolecular force found in CCl2H2 is the strongest?
A.
dispersion forces
B.
dipole-dipole forces
C.
X-forces
D.
hydrogen bonding
E.
none of these
Question #29
Consider the three compounds below, then choose the compound(s) that have hydrogen bonding. 1. H2 2. CH4 3. HF
A.
Only compound 1 has hydrogen bonding.
B.
All three of these compounds have hydrogen bonding.
C.
Only compound 3 has hydrogen bonding.
D.
Only compound 2 has hydrogen bonding.
Question #30
Which compound will have the highest boiling point?
A.
not enough information
B.
CH3CH2OH
C.
CH4
D.
CH3CH3
E.
CH3C(O)CH3
Question #31
Which substance would be expected to have the highest boiling point?
A.
N2
B.
O2
C.
CO
D.
CO2
E.
not enough information
Question #32
Rank the compounds NH3, CH4, and PH3 in order of increasing boiling point.
A.
PH3< NH3 < CH4
B.
CH4 < PH3 < NH3
C.
NH3 < CH4< PH3
D.
NH3 < PH3< CH4
E.
CH4< NH3 < PH3
Question #33
The change of a substance from a liquid to a gaseous form is called:
A.
condensation.
B.
volatile.
C.
heat of fusion.
D.
dynamic equilibrium.
E.
vaporization.
Question #34
Identify the compound with the lowest boiling point.
A.
CH3CHO
B.
(CH3)2O
C.
CH3CH2CH3
D.
CH3CN
E.
CH3OCH3
Question #35
Define vaporization.
A.
A gas becomes a solid.
B.
A liquid becomes a gas.
C.
A solid becomes a gas.
D.
A gas becomes a liquid.
E.
A solid becomes a liquid.
Question #36
Define condensation.
A.
A gas becomes a liquid.
B.
A liquid becomes a gas.
C.
A liquid becomes a solid.
D.
A solid becomes a liquid.
E.
A gas becomes a solid.
Question #37
Describe sweating in humans.
A.
None of these
B.
The sweat evaporates absorbing heat from the body.
C.
The skin is cooled.
D.
It is an endothermic reaction.
E.
All of these
Question #38
Define sublimation.
A.
the phase transition from liquid to gas
B.
the phase transition from solid to gas
C.
the phase transition from gas to liquid
D.
the phase transition from liquid to solid
E.
the phase transition from gas to solid
Question #39
Define freezing.
A.
the phase transition from liquid to gas
B.
the phase transition from gas to solid
C.
the phase transition from solid to gas
D.
the phase transition from gas to liquid
E.
the phase transition from liquid to solid
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