Question 1

The shape of the water-to-glass meniscus results from the strong adhesive forces between glass and water.

Accepted Answer

A) True 
 B)False

Question 2

Osmium tetroxide, OsO4, is a soft crystal that melts at 40°C. The liquid does not conduct electricity. What kind of crystal is this?

Accepted Answer

Question 3

Solid iodine has a vapor pressure of 1.0 mmHg at 39°C. How many moles of iodine will sublime into a 500. mL flask at this temperature? If the volume of the flask is doubled at constant temperature, what will happen to the equilibrium vapor pressure of I2? (Assume some solid I2 is always present in the container.)

Accepted Answer

A) 2.1 * 10-4 mol; vapor pressure increases 
B) 2.0 * 10-2 mol; vapor pressure increases 
C) 2.6 * 10-5 mol; no change in vapor pressure 
D) 2.1 * 10-4 mol; no change in vapor pressure 
E) 2.6* 10-5 mol; vapor pressure decreases 
A) 2.1 * 10-4 mol; vapor pressure increases 
B) 2.0 * 10-2 mol; vapor pressure increases 
C) 2.6 * 10-5 mol; no change in vapor pressure 
D) 2.1 * 10-4 mol; no change in vapor pressure 
E) 2.6* 10-5 mol; vapor pressure decreases

Question 4

Given the following compound and its boiling point, identify whether it is polar or nonpolar: H2S, -60.7°C.

Accepted Answer

Question 5

Indicate all the types of intermolecular forces of attraction in CH2O(g).

Accepted Answer

dipole-dip

Question 6

Choose the response that lists the member of each of the following pairs that has the higher boiling point. (I)H2O or KI (II)HF or HI (III)Cl2 or Br2

Accepted Answer

A) H2O, HF, and Cl2 
B) KI, HF, and Br2 
C) KI, HI, and Br2 
D) H2O, HI, and Cl2 
E) KI, HF, and Cl2 
A) H2O, HF, and Cl2 
B) KI, HF, and Br2 
C) KI, HI, and Br2 
D) H2O, HI, and Cl2 
E) KI, HF, and Cl2

Question 7

Which one of the following substances will have both dispersion forces and dipole-dipole forces?

Accepted Answer

A) HCl 
B) BCl3 
C) Br2 
D) H2 
E) CO2 
A) HCl 
B) BCl3 
C) Br2 
D) H2 
E) CO2

Question 8

Which liquid is expected to have the larger surface tension at a given temperature, CCl4 or H2O? Briefly explain.

Accepted Answer

Water would have the

Question 9

Identify the dominant (strongest)type of intermolecular force present in H2S(g).

Accepted Answer

Question 10

The normal boiling point of methanol (CH3OH)is 64.6°C. Given that the vapor pressure of methanol is 75.0 torr at 15.2°C, calculate the molar enthalpy of vaporization of methanol.

Accepted Answer

A) 0.383 kJ/mol 
B) 3.00 kJ/mol 
C) 38.0 kJ/mol 
D) 27.5 kJ/mol 
E) 74.7 kJ/mol 
A) 0.383 kJ/mol 
B) 3.00 kJ/mol 
C) 38.0 kJ/mol 
D) 27.5 kJ/mol 
E) 74.7 kJ/mol

Question 11

The freezing point of a liquid does not change as the atmospheric pressure changes.

Accepted Answer

A) True 
 B)False

Question 12

How much enthalpy is necessary to heat 10.0 g of solid benzene (C6H6)at 0.0°C to benzene vapor at 100°C?

Accepted Answer

Question 13

Which of the following is not an endothermic process?

Accepted Answer

A) melting of a solid 
B) vaporization 
C) raising the temperature of a gas 
D) condensation of water vapor 
E) sublimation of dry ice 
A) melting of a solid 
B) vaporization 
C) raising the temperature of a gas 
D) condensation of water vapor 
E) sublimation of dry ice

Question 14

Of the pair of compounds given, which would have the stronger intermolecular forces of attraction?
SF4 or C10H22

Accepted Answer

Question 15

Palladium crystallizes in a face-centered cubic unit cell. Its density is 12.0 g/cm3 at 27°C. Calculate the atomic radius of Pd.

Accepted Answer

A) 138 pm 
B) 1.95 * 10-8 nm 
C) 1.95 * 10-8 cm 
D) 154 pm 
E) 0.109 nm 
A) 138 pm 
B) 1.95 * 10-8 nm 
C) 1.95 * 10-8 cm 
D) 154 pm 
E) 0.109 nm

Question 16

Of the pair of compounds given, which would have the stronger intermolecular forces of attraction?
H2S or H2Se

Accepted Answer

Question 17

Which of the responses includes all of the following that can form hydrogen bonds with water molecules? (1)Na+ (2)CH3COOH (3)C2H6 (4)CH3NH2

Accepted Answer

A) (1)and (2) 
B) (1)and (3) 
C) (2)and (3) 
D) (2)and (4) 
E) (3)and (4) 
A) (1)and (2) 
B) (1)and (3) 
C) (2)and (3) 
D) (2)and (4) 
E) (3)and (4)

Question 18

Based on the phase diagram shown below, which is more dense: the liquid phase or the solid phase?

Accepted Answer

the solid

Question 19

Helium atoms do not combine to form He2 molecules, yet He atoms do attract one another weakly through

Accepted Answer

A) dipole-dipole forces. 
B) ion-dipole forces. 
C) dispersion forces. 
D) dipole-induced dipole forces. 
E) hydrogen bonding. 
A) dipole-dipole forces. 
B) ion-dipole forces. 
C) dispersion forces. 
D) dipole-induced dipole forces. 
E) hydrogen bonding.

Question 20

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

Accepted Answer

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

Exam 12: Intermolecular Forces and Liquids and Solids

The shape of the water-to-glass meniscus results from the strong adhesive forces between glass and water.

Osmium tetroxide, OsO4, is a soft crystal that melts at 40°C. The liquid does not conduct electricity. What kind of crystal is this?

Given the following compound and its boiling point, identify whether it is polar or nonpolar: H2S, -60.7°C.

Indicate all the types of intermolecular forces of attraction in CH2O(g).

Choose the response that lists the member of each of the following pairs that has the higher boiling point. (I)H2O or KI (II)HF or HI (III)Cl2 or Br2

Which one of the following substances will have both dispersion forces and dipole-dipole forces?

Which liquid is expected to have the larger surface tension at a given temperature, CCl4 or H2O? Briefly explain.

Identify the dominant (strongest)type of intermolecular force present in H2S(g).

The normal boiling point of methanol (CH3OH)is 64.6°C. Given that the vapor pressure of methanol is 75.0 torr at 15.2°C, calculate the molar enthalpy of vaporization of methanol.

The freezing point of a liquid does not change as the atmospheric pressure changes.

How much enthalpy is necessary to heat 10.0 g of solid benzene (C6H6)at 0.0°C to benzene vapor at 100°C?

Which of the following is not an endothermic process?

Of the pair of compounds given, which would have the stronger intermolecular forces of attraction? SF4 or C10H22

Palladium crystallizes in a face-centered cubic unit cell. Its density is 12.0 g/cm3 at 27°C. Calculate the atomic radius of Pd.

Of the pair of compounds given, which would have the stronger intermolecular forces of attraction? H2S or H2Se

Which of the responses includes all of the following that can form hydrogen bonds with water molecules? (1)Na+ (2)CH3COOH (3)C2H6 (4)CH3NH2

Based on the phase diagram shown below, which is more dense: the liquid phase or the solid phase?

Helium atoms do not combine to form He2 molecules, yet He atoms do attract one another weakly through

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

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

Osmium tetroxide, OsO₄, is a soft crystal that melts at 40°C. The liquid does not conduct electricity. What kind of crystal is this?

Given the following compound and its boiling point, identify whether it is polar or nonpolar: H₂S, -60.7°C.

Indicate all the types of intermolecular forces of attraction in CH₂O(g).

Choose the response that lists the member of each of the following pairs that has the higher boiling point. (I)H₂O or KI (II)HF or HI (III)Cl₂ or Br₂

Which liquid is expected to have the larger surface tension at a given temperature, CCl₄ or H₂O? Briefly explain.

Identify the dominant (strongest)type of intermolecular force present in H₂S(g).

The normal boiling point of methanol (CH₃OH)is 64.6°C. Given that the vapor pressure of methanol is 75.0 torr at 15.2°C, calculate the molar enthalpy of vaporization of methanol.

How much enthalpy is necessary to heat 10.0 g of solid benzene (C₆H₆)at 0.0°C to benzene vapor at 100°C?

Of the pair of compounds given, which would have the stronger intermolecular forces of attraction? SF₄ or C₁₀H₂₂

Palladium crystallizes in a face-centered cubic unit cell. Its density is 12.0 g/cm³ at 27°C. Calculate the atomic radius of Pd.

Of the pair of compounds given, which would have the stronger intermolecular forces of attraction? H₂S or H₂Se

Which of the responses includes all of the following that can form hydrogen bonds with water molecules? (1)Na⁺ (2)CH₃COOH (3)C₂H₆ (4)CH₃NH₂

Helium atoms do not combine to form He₂ molecules, yet He atoms do attract one another weakly through