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