Question 1

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.F) A) and E)
G) A) and B)

Question 2

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) 2F) B) and C)
G) A) and C)

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

Which substance should exhibit hydrogen bonding in the liquid phase?

Accepted Answer

A)   PH3
B)   He
C)   H2S
D)   CH4
E)   CH3OHF) A) and B)
G) A) and C)

Question 5

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

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) A) and B)
G) C) and E)

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

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 torrF) C) and E)
G) A) and E)

Question 8

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)   9F) All of the above
G) A) and E)

Question 9

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 nmF) B) and C)
G) B) and E)

Question 10

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.F) B) and C)
G) A) and E)

Question 11

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 IVF) A) and E)
G) B) and D)

Question 12

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 lineF) B) and C)
G) A) and B)

Question 13

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 14

The arrow in this phase diagram represents which phase change?

Accepted Answer

A)   sublimation
B)   deposition
C)   freezing
D)   vaporization
E)   fusionF) A) and E)
G) B) and D)

Question 15

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 IIIF) A) and B)
G) B) and E)

Question 16

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.D) None of the above
E) A) and C)

Question 17

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)   CO2F) C) and E)
G) A) and E)

Question 18

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

Accepted Answer

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

Question 19

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...

Question 20

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 gF) A) and B)
G) A) and C)

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

The arrow in this phase diagram represents which phase change?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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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.

Correct Answerverifieda. The compound must contain hydrogen bo...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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)

Correct AnswerverifiedShow Answer

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

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

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

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Which substance should exhibit hydrogen bonding in the liquid phase?

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

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

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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?

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

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

Correct AnswerverifiedShow Answer

Which kinds of intermolecular forces exist between propane molecules?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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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

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a. The compound must contain hydrogen bo...
View Answer

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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)

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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?

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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

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

Correct Answer
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