Question 1

In a body-centered cubic array of uniform size spheres, the coordination number of each sphere is:

Accepted Answer

A)  4. 
B)  6. 
C)  8. 
D)  12. 
E)  none of these 
A)  4. 
B)  6. 
C)  8. 
D)  12. 
E)  none of these

Question 2

A metal that crystallizes in a face-centered cubic array of atoms has a radius of 124 pm. What is the length of the edge for the unit cell, in pm?

Accepted Answer

A)  124 pm 
B)  248 pm 
C)  286 pm 
D)  351 pm 
E)  none of these 
A)  124 pm 
B)  248 pm 
C)  286 pm 
D)  351 pm 
E)  none of these

Question 3

Exhibit 11-3 Consider the General Phase Diagram shown below to answer the following problem(s).  
-Refer to Exhibit 11-3. What phase transition would occur upon moving from point B to point A on the phase diagram above?

Accepted Answer

A)  Condensation 
B)  Evaporation 
C)  Freezing 
D)  Melting 
E)  Sublimation 
A)  Condensation 
B)  Evaporation 
C)  Freezing 
D)  Melting 
E)  Sublimation

Question 4

Which molecule listed below would have its intermolecular forces dominated by dispersion forces?

Accepted Answer

A)  N2 
B)  CH3OH 
C)  H2O 
D)  NH3 
E)  none of these 
A)  N2 
B)  CH3OH 
C)  H2O 
D)  NH3 
E)  none of these

Question 5

A diamond crystal is classified as:

Accepted Answer

A)  ionic 
B)  molecular 
C)  covalent network 
D)  metallic 
E)  none of these 
A)  ionic 
B)  molecular 
C)  covalent network 
D)  metallic 
E)  none of these

Question 6

A crystal diffracts x-rays (£ = 154 pm) at an angle of 9.8 ° . What is the spacing between the layers of atoms that produced this diffraction?
(Assume the order of diffraction is one.)

Accepted Answer

A)  13 pm 
B)  76 pm 
C)  78 pm 
D)  452 pm 
E)  none of these 
A)  13 pm 
B)  76 pm 
C)  78 pm 
D)  452 pm 
E)  none of these

Question 7

Aluminum metal crystallizes in a face centered cubic cell . One face of this unit cell is shown in the diagram that follows. The length along one edge equals 4.04 .   What is the atomic radius of an aluminum atom?

Accepted Answer

A)  1.43 Å 
B)  2.02 Å 
C)  2.86 Å 
D)  5.72 Å 
E)  None of these 
A)  1.43 Å 
B)  2.02 Å 
C)  2.86 Å 
D)  5.72 Å 
E)  None of these

Question 8

A metallic element crystallizes in a face-centered cubic array of atoms, for which the length of the cube edge is 351 pm. What is the atomic radius of the metal, in pm?

Accepted Answer

A)  124 pm 
B)  151 pm 
C)  176 pm 
D)  351 pm 
E)  none of these 
A)  124 pm 
B)  151 pm 
C)  176 pm 
D)  351 pm 
E)  none of these

Question 9

Exhibit 11-2 The phase diagram below is needed for the following question(s).  
Refer to Exhibit 11-2. If the temperature and pressure are such that the substance is at point D in the diagram, a slight increase in temperature would cause what type of change?

Accepted Answer

A)  change a solid into a liquid 
B)  change a liquid into a solid 
C)  go from a solid-liquid equilibrium to a liquid 
D)  go from a solid-liquid equilibrium to a solid 
E)  go from a liquid-gas equilibrium to a gas 
A)  change a solid into a liquid 
B)  change a liquid into a solid 
C)  go from a solid-liquid equilibrium to a liquid 
D)  go from a solid-liquid equilibrium to a solid 
E)  go from a liquid-gas equilibrium to a gas

Question 10

Based upon intermolecular forces of attraction, which is the correct order for increasing boiling points among the following three molecules?
N2, H2, and NH3

Accepted Answer

A)  (lowest bp) N2 2 3 (highest bp) 
B)  (lowest bp) H2 2 3 (highest bp) 
C)  (lowest bp) NH3 2 2 (highest bp) 
D)  (lowest bp) NH3 2 2 (highest bp) 
E)  (lowest bp) H2 3 2 (highest bp) 
A)  (lowest bp) N2 2 3 (highest bp) 
B)  (lowest bp) H2 2 3 (highest bp) 
C)  (lowest bp) NH3 2 2 (highest bp) 
D)  (lowest bp) NH3 2 2 (highest bp) 
E)  (lowest bp) H2 3 2 (highest bp)

Question 11

Exhibit 11-1 The heating curve below is needed for the following question(s).  
Refer to Exhibit 11-1. For the heating curve shown, which letter labels the line segment where liquid and gas may be present?

Accepted Answer

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

Question 12

What intermolecular force(s) of attraction is(are) present between two molecules of ethane shown below?
 
I. London dispersion
II. Dipole-dipole
III. Hydrogen bonding

Accepted Answer

A)  I only 
B)  II only 
C)  III only 
D)  I and II 
E)  All of these 
A)  I only 
B)  II only 
C)  III only 
D)  I and II 
E)  All of these

Question 13

Which of the following phase transitions are considered exothermic ?
I. Freezing
II. Condensation
III. Deposition

Accepted Answer

A)  I only 
B)  I and II 
C)  I and III 
D)  II and III 
E)  All of these 
A)  I only 
B)  I and II 
C)  I and III 
D)  II and III 
E)  All of these

Question 14

In a cubic closest packing array of identical atoms, the coordination number of each atom is:

Accepted Answer

A)  4. 
B)  6. 
C)  8. 
D)  12. 
E)  none of these 
A)  4. 
B)  6. 
C)  8. 
D)  12. 
E)  none of these

Question 15

The term that best explains why water rises up a thin glass tube is:

Accepted Answer

A)  capillary action. 
B)  heat of vaporization. 
C)  viscosity. 
D)  surface tension. 
E)  none of these 
A)  capillary action. 
B)  heat of vaporization. 
C)  viscosity. 
D)  surface tension. 
E)  none of these

Question 16

Which of the following would have a boiling point lower than SiCl4?

Accepted Answer

A)  LiCl 
B)  CCl4 
C)  SiBr4 
D)  GeCl4 
E)  none of these 
A)  LiCl 
B)  CCl4 
C)  SiBr4 
D)  GeCl4 
E)  none of these

Question 17

Which of the three states of matter have much greater kinetic energy than their forces of attraction?
I. Solids
II. Liquids
III. Gases

Accepted Answer

A)  I only 
B)  II only 
C)  III only 
D)  I and II 
E)  All of these 
A)  I only 
B)  II only 
C)  III only 
D)  I and II 
E)  All of these

Question 18

Given the three statements below, pick the best answer.
I. Dipole-dipole interactions should contribute to the intermolecular bonding forces of FBr.
II. London forces (instantaneous dipole) are the only intermolecular forces acting between H2 molecules.
III. London forces should be greater for I2 than Br2 because I2 is more polarizable.

Accepted Answer

A)  I and II are correct, III is not 
B)  I and III are correct, II is not 
C)  II and III are correct, I is not 
D)  all are correct 
E)  only III is correct 
A)  I and II are correct, III is not 
B)  I and III are correct, II is not 
C)  II and III are correct, I is not 
D)  all are correct 
E)  only III is correct

Question 19

Iron crystallizes in a body-centered cubic array of atoms. What is the number of atoms per unit cell for this metal?

Accepted Answer

A)  1 
B)  2 
C)  9 
D)  4 
E)  12 
A)  1 
B)  2 
C)  9 
D)  4 
E)  12

Question 20

What intermolecular force(s) is(are) present among molecules of HBr?
I. London dispersion
II. Dipole-dipole
III. Hydrogen bonding

Accepted Answer

A)  I only 
B)  II only 
C)  III only 
D)  I and II 
E)  All of these 
A)  I only 
B)  II only 
C)  III only 
D)  I and II 
E)  All of these

Exam 11: Liquids and Solids

In a body-centered cubic array of uniform size spheres, the coordination number of each sphere is:

A metal that crystallizes in a face-centered cubic array of atoms has a radius of 124 pm. What is the length of the edge for the unit cell, in pm?

Exhibit 11-3 Consider the General Phase Diagram shown below to answer the following problem(s). -Refer to Exhibit 11-3. What phase transition would occur upon moving from point B to point A on the phase diagram above?

Which molecule listed below would have its intermolecular forces dominated by dispersion forces?

A diamond crystal is classified as:

A crystal diffracts x-rays (£ = 154 pm) at an angle of 9.8 ° . What is the spacing between the layers of atoms that produced this diffraction? (Assume the order of diffraction is one.)

Aluminum metal crystallizes in a face centered cubic cell . One face of this unit cell is shown in the diagram that follows. The length along one edge equals 4.04 . What is the atomic radius of an aluminum atom?

A metallic element crystallizes in a face-centered cubic array of atoms, for which the length of the cube edge is 351 pm. What is the atomic radius of the metal, in pm?

Exhibit 11-2 The phase diagram below is needed for the following question(s). Refer to Exhibit 11-2. If the temperature and pressure are such that the substance is at point D in the diagram, a slight increase in temperature would cause what type of change?

Based upon intermolecular forces of attraction, which is the correct order for increasing boiling points among the following three molecules? N2, H2, and NH3

Exhibit 11-1 The heating curve below is needed for the following question(s). Refer to Exhibit 11-1. For the heating curve shown, which letter labels the line segment where liquid and gas may be present?

What intermolecular force(s) of attraction is(are) present between two molecules of ethane shown below? I. London dispersion II. Dipole-dipole III. Hydrogen bonding

Which of the following phase transitions are considered exothermic ? I. Freezing II. Condensation III. Deposition

In a cubic closest packing array of identical atoms, the coordination number of each atom is:

The term that best explains why water rises up a thin glass tube is:

Which of the following would have a boiling point lower than SiCl4?

Which of the three states of matter have much greater kinetic energy than their forces of attraction? I. Solids II. Liquids III. Gases

Iron crystallizes in a body-centered cubic array of atoms. What is the number of atoms per unit cell for this metal?

What intermolecular force(s) is(are) present among molecules of HBr? I. London dispersion II. Dipole-dipole III. Hydrogen bonding

Introduction to Chemistry

Atoms, Molecules, and Ions

Equations, the Mole, and Chemical Formulas

Chemical Reactions in Solution

Thermochemistry

The Gaseous State

Electronic Structure

The Periodic Table: Structure and Trends

Chemical Bonds

Molecular Structure and Bonding Theories

Solutions

Chemical Kinetics

Chemical Equilibrium

Solutions of Acids and Bases

Reactions Between Acids and Bases

Chemical Thermodynamics

Electrochemistry

Transition Metals, Coordination Chemistry and Metallurgy

The Chemistry of Hydrogen, Elements in Groups 3A Through 6A, and the Noble Gases

Nuclear Chemistry

Organic Chemistry and Biochemistry

Filters

Based upon intermolecular forces of attraction, which is the correct order for increasing boiling points among the following three molecules? N₂, H₂, and NH₃

Which of the following would have a boiling point lower than SiCl₄?