Question 1

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 2

Based on the figure above,the boiling point of water under an external pressure of  
Is approximately

Accepted Answer

A) 80 
B) 40 
C) 60 
D) 70 
E) 50 
A) 80 
B) 40 
C) 60 
D) 70 
E) 50

Question 3

The process in which a gas is transformed into a solid is called solidification.

Accepted Answer

A) True 
 B)False

Question 4

Given the following information,calculate ΔH° (in kcal mol-1)for: CaI2(s)→ Ca+2(g)+2 I-(g)

Accepted Answer

A) 1359 kcal mol-1 
B) 1270 kcal mol-1 
C) 2356 kcal mol-1 
D) 1572 kcal mol-1 
E) 1288 kcal mol-1 
A) 1359 kcal mol-1 
B) 1270 kcal mol-1 
C) 2356 kcal mol-1 
D) 1572 kcal mol-1 
E) 1288 kcal mol-1

Question 5

The property of a liquid that measures its resistance to flow is called ________.

Accepted Answer

A) capillarity 
B) polarizability 
C) resistivity 
D) viscosity 
E) wettability 
A) capillarity 
B) polarizability 
C) resistivity 
D) viscosity 
E) wettability

Question 6

The phenomenon of supercooling refers to the existence of a metastable liquid at a temperature below that of its sublimation point.

Accepted Answer

A) True 
 B)False

Question 7

The property of a liquid that measures its resistance to flow is called resistivity.

Accepted Answer

A) True 
 B)False

Question 8

Based on the figure above,the boiling point of diethyl ether under an external pressure of 1.32 bar Is approximately ________ °C.

Accepted Answer

A) 10 
B) 20 
C) 30 
D) 40 
E) 0 
A) 10 
B) 20 
C) 30 
D) 40 
E) 0

Question 9

H2NCH2CH2NH2 probably has a higher boiling point at 1.00 atm pressure than CH3CH2CH2NH2.

Accepted Answer

A) True 
 B)False

Question 10

The normal boiling point for H2Se  is higher than the normal boiling point for H2S .This can be explained by:

Accepted Answer

A) larger dipole-dipole forces for H2Se  
B) larger dispersion forces for H2Se  
C) larger hydrogen-bond forces for H2Se  
D) larger dipole-dipole forces,larger dispersion forces,and larger hydrogen-bond forces for H2Se  
A) larger dipole-dipole forces for H2Se  
B) larger dispersion forces for H2Se  
C) larger hydrogen-bond forces for H2Se  
D) larger dipole-dipole forces,larger dispersion forces,and larger hydrogen-bond forces for H2Se

Question 11

The factor that has the largest effect on the vapor pressure of a molecular substance 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 12

What is the maximum number of glycerol molecules [HOCH2CH(OH)CH2OH] that could form hydrogen bonds to a single molecule of the compound?

Accepted Answer

A) 1 
B) 3 
C) 5 
D) 9 
E) 14 
A) 1 
B) 3 
C) 5 
D) 9 
E) 14

Question 13

Which probably has the lowest boiling point at 1.0 atm pressure?

Accepted Answer

A) C2H6  
B) C4H10  
C) C6H14  
D) C3H8  
E) C5H12  
A) C2H6  
B) C4H10  
C) C6H14  
D) C3H8  
E) C5H12

Question 14

If a substance has a heat of condensation of -1.46 kJ/g and a heat of sublimation of 4.60 kJ/g,what is its heat of solidification in kJ/g?

Accepted Answer

A) 4.60 - 1.46 kJ/g 
B) -(4.60 + 1.46)kJ/g 
C) 1.46 - 4.60 kJ/g 
D) 4.60 + 1.46 kJ/g 
E) 0 kJ/g 
A) 4.60 - 1.46 kJ/g 
B) -(4.60 + 1.46)kJ/g 
C) 1.46 - 4.60 kJ/g 
D) 4.60 + 1.46 kJ/g 
E) 0 kJ/g

Question 15

Arrange the following compounds in order of increasing boiling point:
Pentane (CH3CH2CH2CH2CH3),methyl butane (CH3CH(CH3)CH2CH3),neopentane (CH3C(CH3)3).

Accepted Answer

A) pentane,methyl butane,neopentane 
B) neopentane,methyl butane,pentane 
C) neopentane,pentane,methyl butane 
D) pentane,neopentane,methyl butane 
E) methyl butane,pentane,neopentane 
A) pentane,methyl butane,neopentane 
B) neopentane,methyl butane,pentane 
C) neopentane,pentane,methyl butane 
D) pentane,neopentane,methyl butane 
E) methyl butane,pentane,neopentane

Question 16

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 face-centered cubic cell.

Accepted Answer

A) True 
 B)False

Question 17

If one compares compound A,composed of nonpolar molecules,with compound B,composed of polar molecules,and both molecules have the same molecular formula,then it is true that:

Accepted Answer

A) both compounds have the same boiling point 
B) A boils at a lower temperature than B 
C) B will not boil 
D) B boils at a lower temperature than A 
E) we have to know the structural formula to determine the differences in boiling points of A and B 
A) both compounds have the same boiling point 
B) A boils at a lower temperature than B 
C) B will not boil 
D) B boils at a lower temperature than A 
E) we have to know the structural formula to determine the differences in boiling points of A and B

Question 18

Ethyl alcohol (CH3CH2OH)has a heat of fusion of 5.01 kJ/mol.How much heat in kJ is required to melt 137 g of ethyl alcohol?

Accepted Answer

A) 1.70 × 103 kJ 
B) 129 kJ 
C) 686 kJ 
D) 5.01 kJ 
E) 14.9 kJ 
A) 1.70 × 103 kJ 
B) 129 kJ 
C) 686 kJ 
D) 5.01 kJ 
E) 14.9 kJ

Question 19

What is the edge length of a face-centred cubic unit cell made up of atoms having a radii of 128 pm?

Accepted Answer

A) 181 pm 
B) 362 pm 
C) 512 pm 
D) 1020 pm 
A) 181 pm 
B) 362 pm 
C) 512 pm 
D) 1020 pm

Question 20

The heat of fusion for water is 6.01 kJ/mol and for ethyl alcohol is 5.01 kJ/mol.The amount of heat that would melt 25.0 grams of water would melt how many grams of ethyl alcohol?

Accepted Answer

A) 76.7 g 
B) 53.3 g 
C) 11.7 g 
D) 8.2 g 
E) 30.0 g 
A) 76.7 g 
B) 53.3 g 
C) 11.7 g 
D) 8.2 g 
E) 30.0 g

Exam 12: Intermolecular Forces: Liquids and Solids

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

Based on the figure above,the boiling point of water under an external pressure of Is approximately

The process in which a gas is transformed into a solid is called solidification.

Given the following information,calculate ΔH° (in kcal mol-1)for: CaI2(s)→ Ca+2(g)+2 I-(g)

The property of a liquid that measures its resistance to flow is called ________.

The phenomenon of supercooling refers to the existence of a metastable liquid at a temperature below that of its sublimation point.

The property of a liquid that measures its resistance to flow is called resistivity.

Based on the figure above,the boiling point of diethyl ether under an external pressure of 1.32 bar Is approximately ________ °C.

H2NCH2CH2NH2 probably has a higher boiling point at 1.00 atm pressure than CH3CH2CH2NH2.

The normal boiling point for H2Se is higher than the normal boiling point for H2S .This can be explained by:

The factor that has the largest effect on the vapor pressure of a molecular substance is ________.

What is the maximum number of glycerol molecules [HOCH2CH(OH)CH2OH] that could form hydrogen bonds to a single molecule of the compound?

Which probably has the lowest boiling point at 1.0 atm pressure?

If a substance has a heat of condensation of -1.46 kJ/g and a heat of sublimation of 4.60 kJ/g,what is its heat of solidification in kJ/g?

Arrange the following compounds in order of increasing boiling point: Pentane (CH3CH2CH2CH2CH3),methyl butane (CH3CH(CH3)CH2CH3),neopentane (CH3C(CH3)3).

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 face-centered cubic cell.

If one compares compound A,composed of nonpolar molecules,with compound B,composed of polar molecules,and both molecules have the same molecular formula,then it is true that:

Ethyl alcohol (CH3CH2OH)has a heat of fusion of 5.01 kJ/mol.How much heat in kJ is required to melt 137 g of ethyl alcohol?

What is the edge length of a face-centred cubic unit cell made up of atoms having a radii of 128 pm?

The heat of fusion for water is 6.01 kJ/mol and for ethyl alcohol is 5.01 kJ/mol.The amount of heat that would melt 25.0 grams of water would melt how many grams of ethyl alcohol?

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

Given the following information,calculate ΔH° (in kcal mol^-1)for: CaI₂(s)→ Ca⁺²(g)+2 I^-(g)

H₂NCH₂CH₂NH₂probably has a higher boiling point at 1.00 atm pressure than CH₃CH₂CH₂NH_2.

The normal boiling point for H₂Se is higher than the normal boiling point for H₂S.This can be explained by:

What is the maximum number of glycerol molecules [HOCH₂CH(OH)CH₂OH] that could form hydrogen bonds to a single molecule of the compound?

Arrange the following compounds in order of increasing boiling point: Pentane (CH₃CH₂CH₂CH₂CH₃),methyl butane (CH₃CH(CH₃)CH₂CH₃),neopentane (CH₃C(CH₃)₃).

Ethyl alcohol (CH₃CH₂OH)has a heat of fusion of 5.01 kJ/mol.How much heat in kJ is required to melt 137 g of ethyl alcohol?