Question 1

Potassium crystallizes in a body-centered cubic lattice. How many atoms are there per unit cell?

Accepted Answer

A) 1 
B) 2 
C) 4 
D) 6 
E) 8 
A) 1 
B) 2 
C) 4 
D) 6 
E) 8

Question 2

Of the given pair of compounds, which would have the higher boiling point?
CH3Cl or CH4

Accepted Answer

Question 3

Which of the following properties indicates the presence of weak intermolecular forces in a liquid?

Accepted Answer

A) a high heat of vaporization 
B) a high critical temperature 
C) a high vapor pressure 
D) a high boiling point 
E) None of the above. 
A) a high heat of vaporization 
B) a high critical temperature 
C) a high vapor pressure 
D) a high boiling point 
E) None of the above.

Question 4

Use the graph of vapor pressure to determine the normal boiling point of O2.

Accepted Answer

A) 92 K 
B) 90 K 
C) 88 K 
D) 84 K 
E) O2 doesn't boil because it is always a gas. 
A) 92 K 
B) 90 K 
C) 88 K 
D) 84 K 
E) O2 doesn't boil because it is always a gas.

Question 5

Find the temperature at which water boils on a day in the mountains when the barometric pressure is 593 mmHg. (Given: the heat of vaporization of water is 40.79 kJ/mol)

Accepted Answer

A) 93.1°C 
B) 117°C 
C) 41.5°C 
D) 97.0°C 
E) 68.1°C 
A) 93.1°C 
B) 117°C 
C) 41.5°C 
D) 97.0°C 
E) 68.1°C

Question 6

The triple point of iodine is at 0.12 atm and 115°C. Thus, liquid I2

Accepted Answer

A) is more dense than I2 (s). 
B) cannot exist above 115°C. 
C) is liquid at room temperature. 
D) cannot have a vapor pressure less than 91 torr. 
A) is more dense than I2 (s). 
B) cannot exist above 115°C. 
C) is liquid at room temperature. 
D) cannot have a vapor pressure less than 91 torr.

Question 7

Which of the following liquids would have the highest viscosity at 25°C?

Accepted Answer

A) CH3OCH3 
B) CH2Cl2 
C) C2H5OH 
D) CH3Br 
E) HOCH2CH2OH 
A) CH3OCH3 
B) CH2Cl2 
C) C2H5OH 
D) CH3Br 
E) HOCH2CH2OH

Question 8

What phase exists at the point labeled a?

Accepted Answer

The answer of What phase exists at the point labeled...

Question 9

Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm3. What is the radius of the platinum atom?

Accepted Answer

A) 69 pm 
B) 98 pm 
C) 139 pm 
D) 196 pm 
E) 277 pm 
A) 69 pm 
B) 98 pm 
C) 139 pm 
D) 196 pm 
E) 277 pm

Question 10

The molar heats of sublimation and fusion of iodine are 62.3 kJ/mol and15.3 kJ/mol, respectively. Calculate the molar heat of vaporization of liquid iodine.

Accepted Answer

A) 77.6 kJ/mol 
B) 47.0 kJ/mol 
C) -47.0 kJ/mol 
D) -77.6 kJ/mol 
E) 4.07 kJ/mol 
A) 77.6 kJ/mol 
B) 47.0 kJ/mol 
C) -47.0 kJ/mol 
D) -77.6 kJ/mol 
E) 4.07 kJ/mol

Question 11

Use the graph of vapor pressure to determine the normal boiling point of CHCl3.

Accepted Answer

A) 19°C 
B) 52°C 
C) 60°C 
D) 64°C 
E) 70°C 
A) 19°C 
B) 52°C 
C) 60°C 
D) 64°C 
E) 70°C

Question 12

Given that the heat of vaporization of diethyl ether is 26.0 kJ/mol and the vapor pressure of diethyl ether is 440 torr at 20.°C, calculate the normal boiling point of diethyl ether.

Accepted Answer

36°C (the

Question 13

Given the following liquids and their boiling points, which has the highest vapor pressure at its normal boiling point?

Accepted Answer

A) ethanol, bp = 78°C 
B) methanol, bp = 65°C 
C) water, bp = 100°C 
D) benzene, bp = 80°C 
E) The vapor pressure of each of the liquids at its normal boiling point would be the same. 
A) ethanol, bp = 78°C 
B) methanol, bp = 65°C 
C) water, bp = 100°C 
D) benzene, bp = 80°C 
E) The vapor pressure of each of the liquids at its normal boiling point would be the same.

Question 14

Octane is a liquid component of gasoline. Given the following vapor pressures of octane at various temperatures, estimate the boiling point of octane in Leadville, Colorado, where the atmospheric pressure is 496 mmHg. 400 mmHg @ 104°C, 500 mmHg @ 111°C, 600 mmHg @ 117°C,
700 mmHg @ 122°C, 760 mmHg @ 125°C

Accepted Answer

A) 125°C 
B) 120°C 
C) 115°C 
D) 110°C 
E) 105°C 
A) 125°C 
B) 120°C 
C) 115°C 
D) 110°C 
E) 105°C

Question 15

Copper crystallizes in a face-centered cubic unit cell. The density of copper is 8.94 g/cm3. Calculate the length of the edge of the unit cell in pm.

Accepted Answer

Question 16

Which of the following substances would have the highest critical temperature?

Accepted Answer

A) CH3Cl 
B) C2H6 
C) F2 
D) H2 
E) CO2 
A) CH3Cl 
B) C2H6 
C) F2 
D) H2 
E) CO2

Question 17

The molar enthalpy of vaporization of boron tribromide is 30.5 kJ/mol, and its normal boiling point is 91°C. What is the vapor pressure of BBr3 at 20°C?

Accepted Answer

A) 11.5 torr 
B) 311 torr 
C) 5.31 torr 
D) 143 torr 
E) 66.1 torr 
A) 11.5 torr 
B) 311 torr 
C) 5.31 torr 
D) 143 torr 
E) 66.1 torr

Question 18

Which one of the following substances should exhibit hydrogen bonding in the liquid state?

Accepted Answer

A) PH3 
B) H2 
C) H2S 
D) CH4 
E) NH3 
A) PH3 
B) H2 
C) H2S 
D) CH4 
E) NH3

Question 19

The molecular property related to the ease with which the electron density in a neutral atom or molecule can be distorted is called

Accepted Answer

A) a dipole moment. 
B) polarizability. 
C) a dispersion force. 
D) surface tension. 
E) a van der Waals force. 
A) a dipole moment. 
B) polarizability. 
C) a dispersion force. 
D) surface tension. 
E) a van der Waals force.

Question 20

The structural form of the element Ge closely resembles the structure of

Accepted Answer

A) C (diamond). 
B) N (diatomic). 
C) As (tetrahedral). 
D) S (S8 ring). 
E) Kr (monatomic). 
A) C (diamond). 
B) N (diatomic). 
C) As (tetrahedral). 
D) S (S8 ring). 
E) Kr (monatomic).

Exam 12: Intermolecular Forces and Liquids and Solids

Potassium crystallizes in a body-centered cubic lattice. How many atoms are there per unit cell?

Of the given pair of compounds, which would have the higher boiling point? CH3Cl or CH4

Which of the following properties indicates the presence of weak intermolecular forces in a liquid?

Use the graph of vapor pressure to determine the normal boiling point of O2.

Find the temperature at which water boils on a day in the mountains when the barometric pressure is 593 mmHg. (Given: the heat of vaporization of water is 40.79 kJ/mol)

The triple point of iodine is at 0.12 atm and 115°C. Thus, liquid I2

Which of the following liquids would have the highest viscosity at 25°C?

What phase exists at the point labeled a?

Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm3. What is the radius of the platinum atom?

The molar heats of sublimation and fusion of iodine are 62.3 kJ/mol and15.3 kJ/mol, respectively. Calculate the molar heat of vaporization of liquid iodine.

Use the graph of vapor pressure to determine the normal boiling point of CHCl3.

Given that the heat of vaporization of diethyl ether is 26.0 kJ/mol and the vapor pressure of diethyl ether is 440 torr at 20.°C, calculate the normal boiling point of diethyl ether.

Given the following liquids and their boiling points, which has the highest vapor pressure at its normal boiling point?

Copper crystallizes in a face-centered cubic unit cell. The density of copper is 8.94 g/cm3. Calculate the length of the edge of the unit cell in pm.

Which of the following substances would have the highest critical temperature?

The molar enthalpy of vaporization of boron tribromide is 30.5 kJ/mol, and its normal boiling point is 91°C. What is the vapor pressure of BBr3 at 20°C?

Which one of the following substances should exhibit hydrogen bonding in the liquid state?

The molecular property related to the ease with which the electron density in a neutral atom or molecule can be distorted is called

The structural form of the element Ge closely resembles the structure of

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

Of the given pair of compounds, which would have the higher boiling point? CH₃Cl or CH₄

Use the graph of vapor pressure to determine the normal boiling point of O₂.

The triple point of iodine is at 0.12 atm and 115°C. Thus, liquid I₂

Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm³. What is the radius of the platinum atom?

Use the graph of vapor pressure to determine the normal boiling point of CHCl₃.

Copper crystallizes in a face-centered cubic unit cell. The density of copper is 8.94 g/cm³. Calculate the length of the edge of the unit cell in pm.

The molar enthalpy of vaporization of boron tribromide is 30.5 kJ/mol, and its normal boiling point is 91°C. What is the vapor pressure of BBr₃ at 20°C?