Question 1

Which of the following substances should have the highest boiling point?

Accepted Answer

A) CH4 
B) Cl2 
C) Kr 
D) CH3Cl 
E) N2 
A) CH4 
B) Cl2 
C) Kr 
D) CH3Cl 
E) N2 D

Question 2

Silver metal crystallizes in a face-centered cubic lattice with L as the length of one edge of the unit cube. The center-to-center distance between nearest silver atoms is

Accepted Answer

A) L/2. 
B)    
C) 2L. 
D)    
E) None of the above. 
A) L/2. 
B)    
C) 2L. 
D)    
E) None of the above. D

Question 3

Indicate all the types of intermolecular forces of attraction in CH3OH(l).

Accepted Answer

hydrogen bonding and dispersion

Question 4

Suppose the atoms in a two-dimensional crystal have the following arrangement:   On the drawing above, sketch the unit cell of this crystal.

Accepted Answer

The answer of Suppose the atoms in a two-dimensional crystal...

Question 5

Which of the following would be expected to have the highest vapor pressure at room temperature?

Accepted Answer

A) ethanol, bp = 78°C 
B) methanol, bp = 65°C 
C) water, bp = 100°C 
D) acetone, bp = 56°C 
A) ethanol, bp = 78°C 
B) methanol, bp = 65°C 
C) water, bp = 100°C 
D) acetone, bp = 56°C

Question 6

MgO has the same crystal structure as NaCl, face-centered cubic. How many oxide ions surround each Mg2+ ion as nearest neighbors?

Accepted Answer

A) 4 
B) 6 
C) 8 
D) 10 
E) 12 
A) 4 
B) 6 
C) 8 
D) 10 
E) 12

Question 7

The normal boiling point of bromine is 58.8°C. Given that the vapor pressure of bromine is 75.0 torr at 2.5°C, calculate the molar enthalpy of vaporization of bromine.

Accepted Answer

A) 3.76 kJ/mol 
B) 31.3 kJ/mol 
C) 2.90 kJ/mol 
D) 3.57 kJ/mol 
E) 29.7 kJ/mol 
A) 3.76 kJ/mol 
B) 31.3 kJ/mol 
C) 2.90 kJ/mol 
D) 3.57 kJ/mol 
E) 29.7 kJ/mol

Question 8

Iron crystallizes in a body-centered cubic unit. The edge of this cell is 287 pm. Calculate the density of iron.

Accepted Answer

The answer of Iron crystallizes in a body-centered cubic unit....

Question 9

Of the given pair of compounds, which would have the higher boiling point?
C3H8 or CH3OCH3

Accepted Answer

Question 10

The molar enthalpy of vaporization of carbon disulfide is 26.74 kJ/mol, and its normal boiling point is 46°C. What is the vapor pressure of CS2 at 0°C?

Accepted Answer

A) 447 torr 
B) 4160 torr 
C) 313 torr 
D) 139 torr 
E) 5.47 torr 
A) 447 torr 
B) 4160 torr 
C) 313 torr 
D) 139 torr 
E) 5.47 torr

Question 11

Of the given pair of compounds, which would have the higher boiling point?
NH3 or CH4

Accepted Answer

Question 12

Crystals of elemental sulfur are easily crushed, and melt at 113°C. Liquid sulfur does not conduct electricity. What kind of crystal is this?

Accepted Answer

The answer of Crystals of elemental sulfur are easily crushed,...

Question 13

Which of the following atoms does not participate in hydrogen bonding?

Accepted Answer

A) S 
B) O 
C) F 
D) N 
A) S 
B) O 
C) F 
D) N

Question 14

Of the pair of compounds given, which would have the stronger intermolecular forces of attraction?
NH3 or PH3

Accepted Answer

Question 15

Krypton has a higher melting point than argon because of its

Accepted Answer

A) hydrogen bonding. 
B) stronger dispersion forces. 
C) permanent dipole moment. 
D) ionic bonds. 
E) greater ionization energy. 
A) hydrogen bonding. 
B) stronger dispersion forces. 
C) permanent dipole moment. 
D) ionic bonds. 
E) greater ionization energy.

Question 16

Suppose the atoms in a two-dimensional crystal have the following arrangement:   What is the coordination number of each atom in this crystal?

Accepted Answer

The answer of Suppose the atoms in a two-dimensional crystal...

Question 17

Given the following compound and its boiling point, identify whether it is polar or nonpolar: F2, -188.1°C.

Accepted Answer

Question 18

Methane has a heat of fusion of 0.84 kJ/mol and a heat of vaporization of 9.2 kJ/mol. Estimate the value for the heat of sublimation.

Accepted Answer

The answer of Methane has a heat of fusion of...

Question 19

The vapor pressure of ethanol is 400 mmHg at 63.5°C. Its molar heat of vaporization is 39.3 kJ/mol. What is vapor pressure of ethanol, in mmHg, at 34.9°C?

Accepted Answer

A) 1,510 mmHg 
B) 100 mmHg 
C) 200 mmHg 
D) 0.0099 mmHg 
E) 4.61 mmHg 
A) 1,510 mmHg 
B) 100 mmHg 
C) 200 mmHg 
D) 0.0099 mmHg 
E) 4.61 mmHg

Question 20

A liquid boils when its

Accepted Answer

A) vapor pressure is exactly 1 atmosphere. 
B) vapor pressure is equal to, or greater than, the external pressure pushing on it. 
C) temperature is equal to 273 K (standard temperature). 
D) temperature is greater than room temperature. 
A) vapor pressure is exactly 1 atmosphere. 
B) vapor pressure is equal to, or greater than, the external pressure pushing on it. 
C) temperature is equal to 273 K (standard temperature). 
D) temperature is greater than room temperature.

Exam 12: Intermolecular Forces and Liquids and Solids

Which of the following substances should have the highest boiling point?

Silver metal crystallizes in a face-centered cubic lattice with L as the length of one edge of the unit cube. The center-to-center distance between nearest silver atoms is

Indicate all the types of intermolecular forces of attraction in CH3OH(l).

Suppose the atoms in a two-dimensional crystal have the following arrangement: On the drawing above, sketch the unit cell of this crystal.

Which of the following would be expected to have the highest vapor pressure at room temperature?

MgO has the same crystal structure as NaCl, face-centered cubic. How many oxide ions surround each Mg2+ ion as nearest neighbors?

The normal boiling point of bromine is 58.8°C. Given that the vapor pressure of bromine is 75.0 torr at 2.5°C, calculate the molar enthalpy of vaporization of bromine.

Iron crystallizes in a body-centered cubic unit. The edge of this cell is 287 pm. Calculate the density of iron.

Of the given pair of compounds, which would have the higher boiling point? C3H8 or CH3OCH3

The molar enthalpy of vaporization of carbon disulfide is 26.74 kJ/mol, and its normal boiling point is 46°C. What is the vapor pressure of CS2 at 0°C?

Of the given pair of compounds, which would have the higher boiling point? NH3 or CH4

Crystals of elemental sulfur are easily crushed, and melt at 113°C. Liquid sulfur does not conduct electricity. What kind of crystal is this?

Which of the following atoms does not participate in hydrogen bonding?

Of the pair of compounds given, which would have the stronger intermolecular forces of attraction? NH3 or PH3

Krypton has a higher melting point than argon because of its

Suppose the atoms in a two-dimensional crystal have the following arrangement: What is the coordination number of each atom in this crystal?

Given the following compound and its boiling point, identify whether it is polar or nonpolar: F2, -188.1°C.

Methane has a heat of fusion of 0.84 kJ/mol and a heat of vaporization of 9.2 kJ/mol. Estimate the value for the heat of sublimation.

The vapor pressure of ethanol is 400 mmHg at 63.5°C. Its molar heat of vaporization is 39.3 kJ/mol. What is vapor pressure of ethanol, in mmHg, at 34.9°C?

A liquid boils when its

Introduction

Atoms, Molecules, and Ions

Stoichiometry

Reactions in Aqueous Solution

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

Indicate all the types of intermolecular forces of attraction in CH₃OH(l).

MgO has the same crystal structure as NaCl, face-centered cubic. How many oxide ions surround each Mg²⁺ ion as nearest neighbors?

Of the given pair of compounds, which would have the higher boiling point? C₃H₈ or CH₃OCH₃

The molar enthalpy of vaporization of carbon disulfide is 26.74 kJ/mol, and its normal boiling point is 46°C. What is the vapor pressure of CS₂ at 0°C?

Of the given pair of compounds, which would have the higher boiling point? NH₃ or CH₄

Of the pair of compounds given, which would have the stronger intermolecular forces of attraction? NH₃ or PH₃

Given the following compound and its boiling point, identify whether it is polar or nonpolar: F₂, -188.1°C.