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