Question 1

Crystalline solids .

Accepted Answer

A)   are usually very soft
B)   exist only at high temperatures
C)   exist only at very low temperatures
D)   have their particles arranged randomly
E)   have highly ordered structures

Question 2

The intermolecular force(s)  responsible for the fact that CH4 has the lowest boiling point in the set CH4, SiH4, GeH4, SnH4 is/are .

Accepted Answer

A)   mainly hydrogen bonding but also dipole- dipole interactions
B)   dipole- dipole interactions
C)   London dispersion forces
D)   mainly London- dispersion forces but also dipole- dipole interactions
E)   hydrogen bonding

Question 3

The scattering of light waves upon passing through a narrow slit is called .

Accepted Answer

A)   grating
B)   diffusion
C)   incidence
D)   adhesion
E)   diffraction

Question 4

A gas is _ and assumes of its container whereas a liquid is and assumes of its container.

Accepted Answer

A)   compressible, the shape, not compressible, the volume and shape
B)   condensed, the volume and shape, condensed, the volume and shape
C)   compressible, the volume and shape, compressible, the volume
D)   condensed, the shape, compressible, the volume and shape
E)   compressible, the volume and shape, not compressible, the shape of a portion

Question 5

When the phase diagram for a substance has a solid- liquid phase boundary line that has a negative slope (leans to the left) , the substance .

Accepted Answer

A)   can go from solid to liquid, within a small temperature range, via the application of pressure
B)   cannot be liquefied above its triple point
C)   sublimes rather than melts under ordinary conditions
D)   cannot go from solid to liquid by application of pressure at any temperature
E)   melts rather than sublimes under ordinary conditions

Question 6

Of the following, is the most volatile.

Accepted Answer

A)   CCl4 
B)   CF4 
C)   CBr4 
D)   CH4 
E)   C6H14

Question 7

The predominant intermolecular force in CaBr2 is _ .

Accepted Answer

A)   dipole- dipole forces
B)   London- dispersion forces
C)   ion- dipole forces
D)   hydrogen bonding
E)   ionic bonding

Question 8

Which statements about viscosity are true?
(i)  Viscosity increases as temperature decreases.
(ii)  Viscosity increases as molecular weight increases.
(iii)  Viscosity increases as intermolecular forces increase.

Accepted Answer

A)   (i)  only
B)   (i)  and (iii) 
C)   (ii)  and (iii) 
D)   none
E)   all

Question 9

The heating curve shown was generated by measuring the heat flow and temperature of a solid as it was heated. The heat flow into the sample in the segment will yield the value of the O Hvap of this substance.

Accepted Answer

A)   AB
B)   BC
C)   CD
D)   DE
E)   EF

Question 10

CsCl crystallizes in a unit cell that contains the Cs+ ion at the center of a cube that has a Cl- at each corner. Each unit cell contains Cs+ ions and Cl- , ions, respectively.

Accepted Answer

A)   1 and 8
B)   2 and 1
C)   1 and 1
D)   2 and 4
E)   2 and 2

Question 11

Which one of the following substances will have hydrogen bonding as one of its intermolecular forces?

Accepted Answer

A)  
B)   
C)  
D)   
E)

Question 12

Heat of sublimation can be approximated by adding together and .

Accepted Answer

A)   heat of freezing (solidification) , heat of condensation
B)   heat of fusion, heat of condensation
C)   heat of freezing (solidification) , heat of vaporization
D)   heat of fusion, heat of vaporization
E)   heat of deposition, heat of vaporization

Question 13

Volatility and vapor pressure are .

Accepted Answer

A)   both independent of temperature
B)   not related
C)   the same thing
D)   inversely proportional to one another
E)   directly proportional to one another

Question 14

London Dispersion Forces tend to in strength with increasing molecular weight.

Accepted Answer

The answer of London Dispersion Forces tend to in strength...

Question 15

In general, intramolecular forces determine the properties of a substance and intermolecular forces determine its properties.

Accepted Answer

The answer of In general, intramolecular forces determine the properties...

Question 16

An ionic solid, NaCl (s) , dissolves in water because of the .

Accepted Answer

A)   relatively low melting point
B)   strong coulombic interactions between oppositely charged ions
C)   1:1 ratio of ions in the unit cell
D)   simple face- centered cubic unit cell type it forms
E)   relatively low lattice energy due to small charges of Na+ and Cl- ions

Question 17

The normal boiling point of the substance with the phase diagram shown above is _ °C.

Accepted Answer

A)   10
B)   20
C)   30
D)   40
E)   50

Question 18

Based on the figure above, the boiling point of diethyl ether under an external pressure of 1.32 atm is °C.

Accepted Answer

A)   20
B)   0
C)   10
D)   30
E)   40

Question 19

On the phase diagram below, segment corresponds to the conditions of temperature and pressure under which the solid and the gas of the substance are in equilibrium.

Accepted Answer

A)   AB
B)   BC
C)   AC
D)   CD
E)   AD

Question 20

The heating curve shown was generated by measuring the heat flow and temperature for a solid as it was heated. The slope of the segment corresponds to the heat capacity of the liquid of the substance.

Accepted Answer

A)   AB
B)   BC
C)   CD
D)   DE
E)   EF

Exam 11: Intermolecular Forces, Liquids, and Solids

The predominant intermolecular force in CaBr2 is _ .

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Based on the figure above, the boiling point of diethyl ether under an external pressure of 1.32 atm is °C.

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Of the following, is the most volatile.

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An ionic solid, NaCl (s) , dissolves in water because of the .

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A gas is _ and assumes of its container whereas a liquid is and assumes of its container.

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CsCl crystallizes in a unit cell that contains the Cs+ ion at the center of a cube that has a Cl- at each corner. Each unit cell contains Cs+ ions and Cl- , ions, respectively.

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In general, intramolecular forces determine the properties of a substance and intermolecular forces determine its properties.

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The normal boiling point of the substance with the phase diagram shown above is _ °C.

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Which statements about viscosity are true? (i) Viscosity increases as temperature decreases. (ii) Viscosity increases as molecular weight increases. (iii) Viscosity increases as intermolecular forces increase.

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The heating curve shown was generated by measuring the heat flow and temperature for a solid as it was heated. The slope of the segment corresponds to the heat capacity of the liquid of the substance.

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Crystalline solids .

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Volatility and vapor pressure are .

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Heat of sublimation can be approximated by adding together and .

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London Dispersion Forces tend to in strength with increasing molecular weight.

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The heating curve shown was generated by measuring the heat flow and temperature of a solid as it was heated. The heat flow into the sample in the segment will yield the value of the O Hvap of this substance.

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Which one of the following substances will have hydrogen bonding as one of its intermolecular forces?

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The intermolecular force(s) responsible for the fact that CH4 has the lowest boiling point in the set CH4, SiH4, GeH4, SnH4 is/are .

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On the phase diagram below, segment corresponds to the conditions of temperature and pressure under which the solid and the gas of the substance are in equilibrium.

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When the phase diagram for a substance has a solid- liquid phase boundary line that has a negative slope (leans to the left) , the substance .

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The scattering of light waves upon passing through a narrow slit is called .

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The predominant intermolecular force in CaBr₂is _ .

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CsCl crystallizes in a unit cell that contains the Cs⁺ion at the center of a cube that has a Cl^-at each corner. Each unit cell contains Cs⁺ions and Cl^-, ions, respectively.

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The heating curve shown was generated by measuring the heat flow and temperature of a solid as it was heated. The heat flow into the sample in the segment will yield the value of the O H_vapof this substance.

Correct Answer
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The intermolecular force(s) responsible for the fact that CH₄has the lowest boiling point in the set CH₄, SiH₄, GeH₄, SnH₄is/are .

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