Question 1

Which of the following statements concerning a face-centered cubic unit cell and the corresponding lattice, made up of identical atoms, is incorrect?

Accepted Answer

A)   The coordination number of the atoms in the lattice is 8.
B)   The packing in this lattice is more efficient than for a body-centered cubic system.
C)   If the atoms have radius r, then the length of the cube edge is 8 × r.
D)   There are four atoms per unit cell in this type of packing.
E)   The packing efficiency in this lattice and hexagonal close packing are the same.F) B) and D)
G) A) and B)

Question 2

In hydrogen iodide __________________ are the most important intermolecular forces.

Accepted Answer

A)   dipole-dipole forces
B)   London dispersion forces
C)   hydrogen bonding
D)   covalent bonds
E)   polar covalent bondsF) B) and C)
G) D) and E)

Question 3

Which one of the following substances does not exist in the indicated solid type?

Accepted Answer

A)   graphite - network
B)   Na - metallic
C)   SiO2 - molecular
D)   NaCl - ionic
E)   diamond - networkF) A) and E)
G) B) and C)

Question 4

Use molecular orbital band diagrams to explain why metals are good conductors but semiconductors are not.

Accepted Answer

<img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> In metals, the conduction and valence b...

Question 5

When silicon is doped with an element from group 3A(13) , the device/material produced is a/an

Accepted Answer

A)   intrinsic semiconductor.
B)   p-type semiconductor.
C)   n-type semiconductor.
D)   p-n junction.
E)   transistor.F) A) and B)
G) B) and D)

Question 6

When the electron cloud of a molecule is easily distorted, the molecule has a high _____________.

Accepted Answer

A)   polarity
B)   polarizability
C)   dipole moment
D)   van der Waals radius
E)   compressibilityF) A) and C)
G) D) and E)

Question 7

The strongest intermolecular interactions between hydrogen fluoride (HF)  molecules arise from

Accepted Answer

A)   dipole-dipole forces.
B)   London dispersion forces.
C)   hydrogen bonding.
D)   ion-dipole interactions.
E)   ionic bonds.F) All of the above
G) D) and E)

Question 8

a. State the essential requirements for hydrogen bonding to be important in a compound.
b. List four properties of water which are significantly influenced by the presence of hydrogen bonding.

Accepted Answer

a. The compound must contain hydrogen bo...

Question 9

A metal with a body-centered cubic lattice will have ______ atom(s)  per unit cell.

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   9F) B) and D)
G) C) and D)

Question 10

Examine the following phase diagram and identify the feature represented by point A.

Accepted Answer

A)   melting point
B)   critical point
C)   triple point
D)   sublimation point
E)   boiling pointF) C) and D)
G) All of the above

Question 11

The energy of a hydrogen bond is greater than that of a typical covalent bond.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is true about kinetic energy, Ek, and potential energy, Ep, when ethyl alcohol at 40°C is compared with ethyl alcohol at 20°C?

Accepted Answer

A)   Ek(40°
C)   k(20°
C)  ; Ep(40°
C)    Ep(20°
C)  
B)   Ek(40°
C)   > Ek(20°
C)  ; Ep(40°
C)    Ep(20°
C)  
C)   Ep(40°
C)   p(20°
C)  ; Ek(40°
C)    Ek(20°
C)  
D)   Ep(40°
C)   > Ep(20°
C)  ; Ek(40°
C)    Ek(20°
C)  
E)   Ep(40°
C)   > Ep(20°
C)  ; Ek(40°
C)   > Ek(20°
C)  F) D) and E)
G) All of the above

Question 13

A sample of octane in equilibrium with its vapor in a closed 1.0-L container has a vapor pressure of 50.0 torr at 45°C. The container's volume is increased to 2.0 L at constant temperature and the liquid/vapor equilibrium is reestablished. What is the vapor pressure?

Accepted Answer

A)   > 50.0 torr
B)   50.0 torr
C)   25.0 torr
D)   The mass of the octane vapor is needed to calculate the vapor pressure.
E)   The external pressure is needed to calculate the vapor pressure.F) B) and C)
G) C) and D) B

Question 14

Neon atoms are attracted to each other by

Accepted Answer

A)   dipole-dipole forces.
B)   London dispersion forces.
C)   hydrogen bonding.
D)   covalent bonding.
E)   intramolecular forces.F) All of the above
G) B) and E)

Question 15

Mercury melts at -39°C and boils at 357°C. Draw a diagram of the heating curve of mercury. Label all lines and axes, and clearly indicate the melting and boiling points on your diagram.

Accepted Answer

The answer of Mercury melts at -39°C and boils at...

Question 16

A liquid may be made to boil at room temperature, simply by lowering the pressure.

Accepted Answer

A) True 
 B)False

Question 17

The vapor pressure of 1-butene is 1.268 atm at 273.15 K and its heat of vaporization is 22.9 kJ/mol. What is the normal boiling point of 1-butene?

Accepted Answer

266.9 K

Question 18

Which of the following atoms should have the smallest polarizability?

Accepted Answer

A)   Si
B)   S
C)   Te
D)   Bi
E)   BrF) A) and B)
G) A) and C)

Question 19

Of the five major types of crystalline solid, which would you expect each of the following to form? (e.g., H2O: molecular)
a. Sn
b. Si
c. KCl
d. Xe
e. F2

Accepted Answer

a. metallic
b. netwo...

Question 20

Which of the following pairs is arranged with the particle of higher polarizability listed first?

Accepted Answer

A)   Se2-, S2-
B)   I, I-
C)   Mg2+, Mg
D)   Br, I
E)   none of the aboveF) B) and E)
G) B) and C)

Exam 12: Intermolecular Forces: Liquids, Solids, and Phase Changes

Which of the following statements concerning a face-centered cubic unit cell and the corresponding lattice, made up of identical atoms, is incorrect?

Correct AnswerverifiedShow Answer

In hydrogen iodide __________________ are the most important intermolecular forces.

Correct AnswerverifiedShow Answer

Which one of the following substances does not exist in the indicated solid type?

Correct AnswerverifiedShow Answer

Use molecular orbital band diagrams to explain why metals are good conductors but semiconductors are not.

Correct Answerverified In metals, the conduction and valence b...View AnswerShow Answer

When silicon is doped with an element from group 3A(13) , the device/material produced is a/an

Correct AnswerverifiedShow Answer

When the electron cloud of a molecule is easily distorted, the molecule has a high _____________.

Correct AnswerverifiedShow Answer

The strongest intermolecular interactions between hydrogen fluoride (HF) molecules arise from

Correct AnswerverifiedShow Answer

a. State the essential requirements for hydrogen bonding to be important in a compound. b. List four properties of water which are significantly influenced by the presence of hydrogen bonding.

Correct Answerverifieda. The compound must contain hydrogen bo...View AnswerShow Answer

A metal with a body-centered cubic lattice will have ______ atom(s) per unit cell.

Correct AnswerverifiedShow Answer

Examine the following phase diagram and identify the feature represented by point A.

Correct AnswerverifiedShow Answer

The energy of a hydrogen bond is greater than that of a typical covalent bond.

Correct AnswerverifiedShow Answer

Which of the following is true about kinetic energy, Ek, and potential energy, Ep, when ethyl alcohol at 40°C is compared with ethyl alcohol at 20°C?

Correct AnswerverifiedShow Answer

A sample of octane in equilibrium with its vapor in a closed 1.0-L container has a vapor pressure of 50.0 torr at 45°C. The container's volume is increased to 2.0 L at constant temperature and the liquid/vapor equilibrium is reestablished. What is the vapor pressure?

Correct AnswerverifiedB

Neon atoms are attracted to each other by

Correct AnswerverifiedShow Answer

Mercury melts at -39°C and boils at 357°C. Draw a diagram of the heating curve of mercury. Label all lines and axes, and clearly indicate the melting and boiling points on your diagram.

Correct Answerverified11ea8ef8_2b5e_fb68_ab0a_9bbc95341bc8_TB5833_00

A liquid may be made to boil at room temperature, simply by lowering the pressure.

Correct AnswerverifiedShow Answer

The vapor pressure of 1-butene is 1.268 atm at 273.15 K and its heat of vaporization is 22.9 kJ/mol. What is the normal boiling point of 1-butene?

Correct Answerverified266.9 K

Which of the following atoms should have the smallest polarizability?

Correct AnswerverifiedShow Answer

Of the five major types of crystalline solid, which would you expect each of the following to form? (e.g., H2O: molecular) a. Sn b. Si c. KCl d. Xe e. F2

Correct Answerverifieda. metallicb. netwo...View AnswerShow Answer

Which of the following pairs is arranged with the particle of higher polarizability listed first?

Correct AnswerverifiedShow Answer

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In metals, the conduction and valence b...
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a. The compound must contain hydrogen bo...
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Which of the following is true about kinetic energy, E_k, and potential energy, E_p, when ethyl alcohol at 40°C is compared with ethyl alcohol at 20°C?

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B

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11ea8ef8_2b5e_fb68_ab0a_9bbc95341bc8_TB5833_00

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266.9 K

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Of the five major types of crystalline solid, which would you expect each of the following to form? (e.g., H₂O: molecular) a. Sn b. Si c. KCl d. Xe e. F₂

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a. metallic
b. netwo...
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Correct Answer
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