Question 1

The factor that has the largest effect on vapor pressure is ________.

Accepted Answer

A)  liquid surface area 
B)  molecular dipole moment 
C)  presence of H bonding 
D)  liquid mole weight 
E)  volume available for vapor 
A)  liquid surface area 
B)  molecular dipole moment 
C)  presence of H bonding 
D)  liquid mole weight 
E)  volume available for vapor

Question 2

Find a FALSE statement about X-rays.

Accepted Answer

A)  diffracted by crystals 
B)  radiation of wavelength approximating 1 Angstrom 
C)  visible to the naked eye 
D)  used to determine the structure of molecules 
E)  produced using high-energy electrons 
A)  diffracted by crystals 
B)  radiation of wavelength approximating 1 Angstrom 
C)  visible to the naked eye 
D)  used to determine the structure of molecules 
E)  produced using high-energy electrons

Question 3

The maximum temperature at which a gas can be liquefied is just below the ________.

Accepted Answer

A)  boiling temperature 
B)  critical temperature 
C)  melting temperature 
D)  normal temperature 
E)  superheating temperature 
A)  boiling temperature 
B)  critical temperature 
C)  melting temperature 
D)  normal temperature 
E)  superheating temperature

Question 4

Below are given the Lewis structures of five molecules. Which one displays the MOST hydrogen bonding?

Accepted Answer

A)   
B)   
C)   
D)   
E)   
A)   
B)   
C)   
D)   
E)

Question 5

There are no types of crystalline solids that are held together by:

Accepted Answer

A)  dipole-dipole interactions 
B)  ionic attractions 
C)  hydrogen bonds 
D)  covalent bonds 
E)  pi bonds only 
A)  dipole-dipole interactions 
B)  ionic attractions 
C)  hydrogen bonds 
D)  covalent bonds 
E)  pi bonds only

Question 6

According to the phase diagram given, which of the following statements is wrong?

Accepted Answer

A)  At the temperature and pressure of point 1, substance W exists as a three-phase equilibrium system. 
B)  At the temperature of point 2, a pressure of 500 torr is sufficient to liquify gaseous W. 
C)  If the W(l) = W(g) system is maintained at the temperature of point 3 while pressure is decreased, more W will vaporize. 
D)  If liquid W is maintained at the pressure of point 4 while the temperature is increased to 80°C, the liquid will vaporize. 
E)  The existence of liquid W at -40°C and 500 torr represents the metastable condition of "supercooling." 
A)  At the temperature and pressure of point 1, substance W exists as a three-phase equilibrium system. 
B)  At the temperature of point 2, a pressure of 500 torr is sufficient to liquify gaseous W. 
C)  If the W(l) = W(g) system is maintained at the temperature of point 3 while pressure is decreased, more W will vaporize. 
D)  If liquid W is maintained at the pressure of point 4 while the temperature is increased to 80°C, the liquid will vaporize. 
E)  The existence of liquid W at -40°C and 500 torr represents the metastable condition of "supercooling."

Question 7

Which of the following compounds has the largest lattice energy? MgCO3, Na2CO3, Al2(CO3)2

Accepted Answer

A)  Na2CO3 
B)  MgCO3 
C)  Al2(CO3)2 
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)2 
D)  They all have the same lattice energy. 
E)  Not enough information is available to determine which is largest.

Question 8

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 9

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

Question 10

A crystal does not conduct electricity, yet its melt and aqueous solutions do. It is hard and brittle and melts at a high temperature. What type of crystal is it?

Accepted Answer

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

Question 11

The enthalpy of fusion is:

Accepted Answer

A)  The quantity of heat required to melt a solid 
B)  The quantity of heat released when a solid melts 
C)  The quantity of heat when two elements are fused together to produce binary compound 
D)  The quantity of heat required to fuse two atomic nuclei 
E)  The quantity of heat released when an organic compound burns in an atmosphere of pure oxygen 
A)  The quantity of heat required to melt a solid 
B)  The quantity of heat released when a solid melts 
C)  The quantity of heat when two elements are fused together to produce binary compound 
D)  The quantity of heat required to fuse two atomic nuclei 
E)  The quantity of heat released when an organic compound burns in an atmosphere of pure oxygen

Question 12

A 0.90 g sample of liquid water was introduced into an evacuated 2.00 L flask, which was then sealed and heated to 37°C. What percentage, by mass, of the water remained as liquid? [Vapor pressure of water at 37°C = 48.2 torr.]

Accepted Answer

A)  10% 
B)  18% 
C)  82% 
D)  90% 
E)  0% 
A)  10% 
B)  18% 
C)  82% 
D)  90% 
E)  0%

Question 13

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 14

All sides are equal in length and all angles are right angles. There is an atom at each corner and one at the center of each side. 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 15

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 16

A crystal and its melt readily conduct electricity. The crystal also has a luster and is easily deformed. Thus, it is:

Accepted Answer

A)  a covalent network crystal 
B)  an ionic crystal 
C)  a metallic crystal 
D)  a molecular crystal 
E)  a covalent crystal. 
A)  a covalent network crystal 
B)  an ionic crystal 
C)  a metallic crystal 
D)  a molecular crystal 
E)  a covalent crystal.

Question 17

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 18

Which probably has the highest boiling point at 1.00 atm pressure?

Accepted Answer

A)  H2NCH2CH2NH2 
B)  CH3CH2CH2NH2 
C)  (CH3)2CHNH2 
D)  CH3CH2NHCH3 
E)  (CH3)3N 
A)  H2NCH2CH2NH2 
B)  CH3CH2CH2NH2 
C)  (CH3)2CHNH2 
D)  CH3CH2NHCH3 
E)  (CH3)3N

Question 19

Which of the following statements concerning molecules in the liquid state is true?

Accepted Answer

A)  Cohesive forces are not important. 
B)  The molecules contract to fit the size of the container. 
C)  The molecules have no motion. 
D)  The molecules are in a patterned (oriented) arrangement. 
E)  The molecules are mobile and relatively close together. 
A)  Cohesive forces are not important. 
B)  The molecules contract to fit the size of the container. 
C)  The molecules have no motion. 
D)  The molecules are in a patterned (oriented) arrangement. 
E)  The molecules are mobile and relatively close together.

Question 20

Which of the following is true assuming point A has P = 180 mmHg, T = 50°C, point C has P = 275 mmHg, T = 200°C and points A, B, and C form a right triangle?

Accepted Answer

A)  At point B, T = 50°C, P = 275 mmHg. 
B)  D is temperature, E is pressure. 
C)  D is pressure, E is volume. 
D)  At point B, T = 200°C, P = 275 mmHg. 
E)  B is a liquid. 
A)  At point B, T = 50°C, P = 275 mmHg. 
B)  D is temperature, E is pressure. 
C)  D is pressure, E is volume. 
D)  At point B, T = 200°C, P = 275 mmHg. 
E)  B is a liquid.

Exam 12: Intermolecular Forces: Liquids and Solids

The factor that has the largest effect on vapor pressure is ________.

Find a FALSE statement about X-rays.

The maximum temperature at which a gas can be liquefied is just below the ________.

Below are given the Lewis structures of five molecules. Which one displays the MOST hydrogen bonding?

There are no types of crystalline solids that are held together by:

According to the phase diagram given, which of the following statements is wrong?

Which of the following compounds has the largest lattice energy? MgCO3, Na2CO3, Al2(CO3)2

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

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?

A crystal does not conduct electricity, yet its melt and aqueous solutions do. It is hard and brittle and melts at a high temperature. What type of crystal is it?

The enthalpy of fusion is:

A 0.90 g sample of liquid water was introduced into an evacuated 2.00 L flask, which was then sealed and heated to 37°C. What percentage, by mass, of the water remained as liquid? [Vapor pressure of water at 37°C = 48.2 torr.]

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?

All sides are equal in length and all angles are right angles. There is an atom at each corner and one at the center of each side. This is a ________.

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?

A crystal and its melt readily conduct electricity. The crystal also has a luster and is easily deformed. Thus, it is:

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?

Which probably has the highest boiling point at 1.00 atm pressure?

Which of the following statements concerning molecules in the liquid state is true?

Which of the following is true assuming point A has P = 180 mmHg, T = 50°C, point C has P = 275 mmHg, T = 200°C and points A, B, and C form a right triangle?

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: Additional Aspects

Solutions and Their Physical Properties

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements I: Groups 1, 2, 13, and 14

Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry 1-41

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

Which of the following compounds has the largest lattice energy? MgCO₃, Na₂CO₃, Al₂(CO₃)₂

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?