Question 1

Which of the following compounds has the highest boiling point?

Accepted Answer

A) NH3  
B) H2O 
C) HF 
D) CH4  
E) HBr 
A) NH3  
B) H2O 
C) HF 
D) CH4  
E) HBr

Question 2

A substance has a heat of fusion of 61.5 kJ/mol and a heat of deposition of -167.4 kJ/mol.What is the heat of sublimation in kJ/mol?

Accepted Answer

A) -61.5 kJ/mol 
B) 61.5 - 167.4 kJ/mol 
C) 61.5 + 167.4 kJ/mol 
D) 167.4 - 61.5 kJ/mol 
E) 167.4 kJ/mol 
A) -61.5 kJ/mol 
B) 61.5 - 167.4 kJ/mol 
C) 61.5 + 167.4 kJ/mol 
D) 167.4 - 61.5 kJ/mol 
E) 167.4 kJ/mol

Question 3

How much heat would be released by the condensation of 5.40 g of steam at 100 °C and the subsequent cooling of the water to 25 °C? 
[ΔvapH = 40.7 kJ/mol at 100 °C;Cp for H2O(l)is 4.18 J g-1 °C-1]

Accepted Answer

A) 12.2 kJ 
B) 12.8 kJ 
C) 13.9 kJ 
D) 18.3 kJ 
E) 23.7 kJ 
A) 12.2 kJ 
B) 12.8 kJ 
C) 13.9 kJ 
D) 18.3 kJ 
E) 23.7 kJ

Question 4

When a liquid is in dynamic equilibrium with its vapor at a given temperature,the following conditions could exist:
I.There is no transfer of molecules between liquid and vapor.
II.The vapor pressure has a unique value.
III.The opposing processes, (liquid to vapor)and (vapor to liquid),proceed at equal rates.
IV.The concentration of vapor is dependent on time.
Which of the above choices are applicable?

Accepted Answer

A) I 
B) II and III 
C) I,II,and III 
D) II and IV 
E) II,III and IV 
A) I 
B) II and III 
C) I,II,and III 
D) II and IV 
E) II,III and IV

Question 5

Which is expected to have the largest dispersion forces?

Accepted Answer

A) C3H8 
B) C12H26 
C) F2 
D) BeCl2 
A) C3H8 
B) C12H26 
C) F2 
D) BeCl2

Question 6

Given the tabulated data,what is the lattice energy of crystalline calcium chloride?

Accepted Answer

A) -1996 kJ/mol 
B) -2101 kJ/mol 
C) -2255 kJ/mol 
D) -2345 kJ/mol 
E) -2450 kJ/mol 
A) -1996 kJ/mol 
B) -2101 kJ/mol 
C) -2255 kJ/mol 
D) -2345 kJ/mol 
E) -2450 kJ/mol

Question 7

A liquid will "wet" a surface if:

Accepted Answer

A) the liquid has a lesser density than the surface 
B) the forces between the liquid molecules are weak 
C) the liquid has a low vapor pressure 
D) the forces between the molecules and the surface are greater than the forces between the molecules of the liquid 
E) The liquid has low viscosity and the surface is smooth 
A) the liquid has a lesser density than the surface 
B) the forces between the liquid molecules are weak 
C) the liquid has a low vapor pressure 
D) the forces between the molecules and the surface are greater than the forces between the molecules of the liquid 
E) The liquid has low viscosity and the surface is smooth

Question 8

In liquid propanol,CH3CH2CH2OH   Which intermolecular forces are present?

Accepted Answer

A) Dispersion,hydrogen bonding and dipole-dipole forces are present. 
B) Only dipole-dipole and ion-dipole forces are present. 
C) Only dispersion and dipole-dipole forces are present. 
D) Only hydrogen bonding forces are present. 
A) Dispersion,hydrogen bonding and dipole-dipole forces are present. 
B) Only dipole-dipole and ion-dipole forces are present. 
C) Only dispersion and dipole-dipole forces are present. 
D) Only hydrogen bonding forces are present.

Question 9

Which of the following statements about viscosity are true:
I.Viscosity is liquid's resistance to flow.
II.Viscosity decreases with a decrease in temperature.
III.Viscosity is not related to the forces between molecules in a liquid.
IV.Viscous liquids have low rate flows.

Accepted Answer

A) I and IV 
B) I and III 
C) I and II 
D) II and IV 
E) III and IV 
A) I and IV 
B) I and III 
C) I and II 
D) II and IV 
E) III and IV

Question 10

Consider a parallelepiped with all edges being equal in length.There is an atom at each corner and one at the center of each face.This is a ________.

Accepted Answer

A) body-centered cubic cell 
B) simple cubic cell 
C) unit cell 
D) face-centered cubic cell 
E) hexagonal unit cell 
A) body-centered cubic cell 
B) simple cubic cell 
C) unit cell 
D) face-centered cubic cell 
E) hexagonal unit cell

Question 11

The normal boiling point of acetone is 56.2 °C and the molar heat of vaporization is 32.0 kJ/mol.At what temperature will acetone boil under a pressure of 50.0 mmHg?

Accepted Answer

A) 156 °C 
B) 6.0 °C 
C) -6.0 °C 
D) 40.7 °C 
E) 73.6 °C 
A) 156 °C 
B) 6.0 °C 
C) -6.0 °C 
D) 40.7 °C 
E) 73.6 °C

Question 12

What is the difference between "normal boiling point" and "boiling point" of a liquid?

Accepted Answer

A) "Normal boiling point" is a boiling point of a liquid at normal (standard)pressure and temperature,while "boiling point" is measured at any other conditions of pressure and temperature. 
B) "Normal boiling point" is a boiling point of 1 mol of a liquid with a surface of 1 m2, while "boiling point" is boiling temperature for any other amount of a substance. 
C) "Normal boiling point" is a boiling point a liquid has at 1 atm of pressure;"boiling point" is a boiling temperature of a liquid at any other pressure. 
D) "Normal boiling point" and "boiling point" are synonyms. 
E) "Normal boiling point" refers to 1 g of substance;"boiling point" refers to any other amount of substance. 
A) "Normal boiling point" is a boiling point of a liquid at normal (standard)pressure and temperature,while "boiling point" is measured at any other conditions of pressure and temperature. 
B) "Normal boiling point" is a boiling point of 1 mol of a liquid with a surface of 1 m2, while "boiling point" is boiling temperature for any other amount of a substance. 
C) "Normal boiling point" is a boiling point a liquid has at 1 atm of pressure;"boiling point" is a boiling temperature of a liquid at any other pressure. 
D) "Normal boiling point" and "boiling point" are synonyms. 
E) "Normal boiling point" refers to 1 g of substance;"boiling point" refers to any other amount of substance.

Question 13

Which of the following compounds has the largest lattice energy?
MgCO3,Na2CO3,Al2(CO3)3

Accepted Answer

A) Na2CO3  
B) MgCO3  
C) Al2(CO3)3 
D) They all have the same lattice energy. 
E) Not enough information is available to determine which is largest. 
A) Na2CO3  
B) MgCO3  
C) Al2(CO3)3 
D) They all have the same lattice energy. 
E) Not enough information is available to determine which is largest.

Question 14

A liquid is in equilibrium with its vapor.If some of the vapor is allowed to escape,what is the immediate result?

Accepted Answer

A) The condensation rate decreases. 
B) The vaporization rate increases. 
C) The condensation rate increases. 
D) The vaporization rate decreases. 
E) The rates of condensation and vaporization are not effected. 
A) The condensation rate decreases. 
B) The vaporization rate increases. 
C) The condensation rate increases. 
D) The vaporization rate decreases. 
E) The rates of condensation and vaporization are not effected.

Question 15

Which of the following forms a molecular solid?

Accepted Answer

A) NH4NO3 
B) C6H4Cl2 
C) SiO2 
D) copper 
A) NH4NO3 
B) C6H4Cl2 
C) SiO2 
D) copper

Question 16

Arrange in order by decreasing boiling point:
Cl2,I2,HI

Accepted Answer

A) I2,Cl2,HI 
B) Cl2,I2,HI 
C) Cl2,HI,I2  
D) HI,Cl2,I2  
E) HI,I2,Cl2  
A) I2,Cl2,HI 
B) Cl2,I2,HI 
C) Cl2,HI,I2  
D) HI,Cl2,I2  
E) HI,I2,Cl2

Question 17

An atom at the corner of cubic unit cell is shared among:

Accepted Answer

A) six adjoining unit cells 
B) four adjoining unit cells 
C) eight adjoining unit cells 
D) ten adjoining unit cells 
E) twelve adjoining unit cells 
A) six adjoining unit cells 
B) four adjoining unit cells 
C) eight adjoining unit cells 
D) ten adjoining unit cells 
E) twelve adjoining unit cells

Question 18

A crystal does not conduct electricity,even after melting.It is hard and brittle and melts at a very high temperature.What type of crystal is it?

Accepted Answer

A) an ionic crystal 
B) an intermetallic (alloy)crystal 
C) a network covalent crystal 
D) a metallic crystal 
E) a molecular crystal 
A) an ionic crystal 
B) an intermetallic (alloy)crystal 
C) a network covalent crystal 
D) a metallic crystal 
E) a molecular crystal

Question 19

The enthalpy of vaporization at 298 K for diethylether (C4H10O)is 26.0 kJ/mol.How much heat would be required to vaporize 1.00 L of the ether at 298 K if its density is 0.714 g/L?

Accepted Answer

A) 440 J 
B) 250 J 
C) 186 J 
D) 130 J 
E) 74.1 J 
A) 440 J 
B) 250 J 
C) 186 J 
D) 130 J 
E) 74.1 J

Question 20

Flask A has a volume of 0.50 L and contains 50 g of a volatile liquid.Flask B has a volume of 1.0 L and contains 25 g of the same liquid.Both flasks are stoppered and both are at 30 °C.The ratio of the vapor pressure of the liquid in Flask A to that in Flask B is:

Accepted Answer

A) 4:1 
B) 2:1 
C) 1:1 
D) 1:2 
E) 1:4 
A) 4:1 
B) 2:1 
C) 1:1 
D) 1:2 
E) 1:4

Exam 12: Intermolecular Forces: Liquids and Solids

Which of the following compounds has the highest boiling point?

A substance has a heat of fusion of 61.5 kJ/mol and a heat of deposition of -167.4 kJ/mol.What is the heat of sublimation in kJ/mol?

How much heat would be released by the condensation of 5.40 g of steam at 100 °C and the subsequent cooling of the water to 25 °C? [ΔvapH = 40.7 kJ/mol at 100 °C;Cp for H2O(l)is 4.18 J g-1 °C-1]

Which is expected to have the largest dispersion forces?

Given the tabulated data,what is the lattice energy of crystalline calcium chloride?

A liquid will "wet" a surface if:

In liquid propanol,CH3CH2CH2OH Which intermolecular forces are present?

Which of the following statements about viscosity are true: I.Viscosity is liquid's resistance to flow. II.Viscosity decreases with a decrease in temperature. III.Viscosity is not related to the forces between molecules in a liquid. IV.Viscous liquids have low rate flows.

Consider a parallelepiped with all edges being equal in length.There is an atom at each corner and one at the center of each face.This is a ________.

The normal boiling point of acetone is 56.2 °C and the molar heat of vaporization is 32.0 kJ/mol.At what temperature will acetone boil under a pressure of 50.0 mmHg?

What is the difference between "normal boiling point" and "boiling point" of a liquid?

Which of the following compounds has the largest lattice energy? MgCO3,Na2CO3,Al2(CO3)3

A liquid is in equilibrium with its vapor.If some of the vapor is allowed to escape,what is the immediate result?

Which of the following forms a molecular solid?

Arrange in order by decreasing boiling point: Cl2,I2,HI

An atom at the corner of cubic unit cell is shared among:

A crystal does not conduct electricity,even after melting.It is hard and brittle and melts at a very high temperature.What type of crystal is it?

The enthalpy of vaporization at 298 K for diethylether (C4H10O)is 26.0 kJ/mol.How much heat would be required to vaporize 1.00 L of the ether at 298 K if its density is 0.714 g/L?

Flask A has a volume of 0.50 L and contains 50 g of a volatile liquid.Flask B has a volume of 1.0 L and contains 25 g of the same liquid.Both flasks are stoppered and both are at 30 °C.The ratio of the vapor pressure of the liquid in Flask A to that in Flask B is:

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

How much heat would be released by the condensation of 5.40 g of steam at 100 °C and the subsequent cooling of the water to 25 °C? [Δ_vapH = 40.7 kJ/mol at 100 °C;C_p for H₂O(l)is 4.18 J g^-1 °C^-1]

In liquid propanol,CH₃CH₂CH₂OH Which intermolecular forces are present?

Which of the following compounds has the largest lattice energy? MgCO₃,Na₂CO₃,Al₂(CO₃)₃

Arrange in order by decreasing boiling point: Cl₂,I₂,HI

The enthalpy of vaporization at 298 K for diethylether (C₄H₁₀O)is 26.0 kJ/mol.How much heat would be required to vaporize 1.00 L of the ether at 298 K if its density is 0.714 g/L?