Question 1

Which one of the following pure substance has 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 2

The arrow in this phase diagram represents which phase change?

Accepted Answer

A)  sublimation 
B)  deposition 
C)  freezing 
D)  vaporization 
E)  fusion 
A)  sublimation 
B)  deposition 
C)  freezing 
D)  vaporization 
E)  fusion

Question 3

Which is not a valid phase diagram for a pure substance?

Accepted Answer

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

Question 4

Which substance should exhibit hydrogen bonding in the liquid phase?

Accepted Answer

A)  PH3 
B)  He 
C)  H2S 
D)  CH4 
E)  CH3OH 
A)  PH3 
B)  He 
C)  H2S 
D)  CH4 
E)  CH3OH

Question 5

________ is the attraction of unlike molecules involved in capillary action.

Accepted Answer

The answer of ________ is the attraction of unlike molecules...

Question 6

Palladium crystallizes in a face-centered cubic unit cell. Its density is 12.0 g/cm3 at 27°C. What is 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 7

Below is the phase diagram for sulfur. Which phase has the highest density at 119°C?

Accepted Answer

A)  liquid 
B)  vapor 
C)  rhombic solid 
D)  monoclinic solid 
E)  liquid-vapor boundary line 
A)  liquid 
B)  vapor 
C)  rhombic solid 
D)  monoclinic solid 
E)  liquid-vapor boundary line

Question 8

Ionic crystals are composed of charged spheres that are held together by covalent bonds.

Accepted Answer

A) True 
 B)False

Question 9

Naphthalene sublimes at room temperature and 1 atmosphere pressure; which statement is true concerning the triple point of naphthalene?

Accepted Answer

A)  The triple point is lower than room temperature. 
B)  The triple point is higher than room temperature. 
C)  The triple point is equal to room temperature. 
A)  The triple point is lower than room temperature. 
B)  The triple point is higher than room temperature. 
C)  The triple point is equal to room temperature.

Question 10

The strongest intermolecular interactions between hydrogen sulfide (H2S) molecules arise from

Accepted Answer

A)  dipole-dipole forces. 
B)  London dispersion forces. 
C)  hydrogen bonding. 
D)  ion-dipole interactions. 
E)  disulfide linkages. 
A)  dipole-dipole forces. 
B)  London dispersion forces. 
C)  hydrogen bonding. 
D)  ion-dipole interactions. 
E)  disulfide linkages.

Question 11

If the adhesive forces between a liquid and the walls of a capillary tube are greater than the cohesive forces within the liquid,

Accepted Answer

A)  the liquid level in a capillary tube will rise above the surrounding liquid and the surface in the capillary tube will have a convex meniscus. 
B)  the liquid level in a capillary tube will rise above the surrounding liquid and the surface in the capillary tube will have a concave meniscus. 
C)  the liquid level in a capillary tube will drop below the surrounding liquid and the surface in the capillary tube will have a convex meniscus. 
D)  the liquid level in a capillary tube will drop below the surrounding liquid and the surface in the capillary tube will have a concave meniscus. 
E)  the liquid level in a capillary tube will be flat. 
A)  the liquid level in a capillary tube will rise above the surrounding liquid and the surface in the capillary tube will have a convex meniscus. 
B)  the liquid level in a capillary tube will rise above the surrounding liquid and the surface in the capillary tube will have a concave meniscus. 
C)  the liquid level in a capillary tube will drop below the surrounding liquid and the surface in the capillary tube will have a convex meniscus. 
D)  the liquid level in a capillary tube will drop below the surrounding liquid and the surface in the capillary tube will have a concave meniscus. 
E)  the liquid level in a capillary tube will be flat.

Question 12

A metal such as chromium in the body-centered cubic lattice has ________ atom(s) per unit cell.

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  9 
A)  1 
B)  2 
C)  3 
D)  4 
E)  9

Question 13

Which of the responses includes all of the following that can form hydrogen bonds with water molecules? I. Na+, II. CH3COOH, III. C2H6, IV. CH3NH2

Accepted Answer

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

Question 14

Which kinds of intermolecular forces exist between propane molecules?

Accepted Answer

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

Question 15

What mass of water would need to evaporate from your skin in order to dissipate 1.70 ×105 J of heat from the surface of your body? H2O(l) → H2O(g) ΔHvap = 40.7 kJ/mol

Accepted Answer

A)  2.26 g 
B)  4.18 g 
C)  75.2 g 
D)  4.18 ×103 g 
E)  4.07 × 104 g 
A)  2.26 g 
B)  4.18 g 
C)  75.2 g 
D)  4.18 ×103 g 
E)  4.07 × 104 g

Question 16

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 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? (R = 8.314 J/K • mol)

Accepted Answer

A)  11.5 torr 
B)  659 torr 
C)  255 torr 
D)  66.2 torr 
E)  167 torr 
A)  11.5 torr 
B)  659 torr 
C)  255 torr 
D)  66.2 torr 
E)  167 torr

Question 18

For which of the following pure substances are the intermolecular interactions entirely due to dispersion forces?

Accepted Answer

A)  C2H6 
B)  CH3OCH3 
C)  NO2 
D)  H2S 
E)  Ca(NO3)2 
A)  C2H6 
B)  CH3OCH3 
C)  NO2 
D)  H2S 
E)  Ca(NO3)2

Question 19

A face-centered crystal lattice has one atom in the center of the unit cell.

Accepted Answer

A) True 
 B)False

Question 20

a. State the essential requirements for hydrogen bonding to be important in a compound.
b. List four properties of water which are significantly influenced by the presence of hydrogen bonding.

Accepted Answer

a. The compound must contain hydrogen bo

Exam 11: Intermolecular Forces and the Physical Properties of Liquids and Solids

Which one of the following pure substance has both dispersion forces and dipole-dipole forces?

The arrow in this phase diagram represents which phase change?

Which is not a valid phase diagram for a pure substance?

Which substance should exhibit hydrogen bonding in the liquid phase?

________ is the attraction of unlike molecules involved in capillary action.

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

Below is the phase diagram for sulfur. Which phase has the highest density at 119°C?

Ionic crystals are composed of charged spheres that are held together by covalent bonds.

Naphthalene sublimes at room temperature and 1 atmosphere pressure; which statement is true concerning the triple point of naphthalene?

The strongest intermolecular interactions between hydrogen sulfide (H2S) molecules arise from

If the adhesive forces between a liquid and the walls of a capillary tube are greater than the cohesive forces within the liquid,

A metal such as chromium in the body-centered cubic lattice has ________ atom(s) per unit cell.

Which of the responses includes all of the following that can form hydrogen bonds with water molecules? I. Na+, II. CH3COOH, III. C2H6, IV. CH3NH2

Which kinds of intermolecular forces exist between propane molecules?

What mass of water would need to evaporate from your skin in order to dissipate 1.70 ×105 J of heat from the surface of your body? H2O(l) → H2O(g) ΔHvap = 40.7 kJ/mol

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

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? (R = 8.314 J/K • mol)

For which of the following pure substances are the intermolecular interactions entirely due to dispersion forces?

A face-centered crystal lattice has one atom in the center of the unit cell.

a. State the essential requirements for hydrogen bonding to be important in a compound. b. List four properties of water which are significantly influenced by the presence of hydrogen bonding.

Chemistry: the Central Science

Atoms, Molecules, and Ions

Stoichiometry: Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Molecular Geometry and Bonding Theories

Gases

Modern Materials

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy, Free Energy, and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

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

The strongest intermolecular interactions between hydrogen sulfide (H₂S) molecules arise from

Which of the responses includes all of the following that can form hydrogen bonds with water molecules? I. Na⁺, II. CH₃COOH, III. C₂H₆, IV. CH₃NH₂

What mass of water would need to evaporate from your skin in order to dissipate 1.70 ×10⁵ J of heat from the surface of your body? H₂O(l) → H₂O(g) ΔH_vap = 40.7 kJ/mol

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? (R = 8.314 J/K • mol)