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