Question 1

How many calcium and fluorine ions are there in the fluorite unit cell shown below?

Accepted Answer

A) 4 Ca2+ and 2 FF1F1F1S1F1F1F10 
B) 4 Ca2+ and 8 FF1F1F1S1F1F1F10 
C) 2 Ca2+ and 4 FF1F1F1S1F1F1F10 
D) 2 Ca2+ and 8 FF1F1F1S1F1F1F10 
E) 4 Ca2+ and 4 FF1F1F1S1F1F1F10 
A) 4 Ca2+ and 2 FF1F1F1S1F1F1F10 
B) 4 Ca2+ and 8 FF1F1F1S1F1F1F10 
C) 2 Ca2+ and 4 FF1F1F1S1F1F1F10 
D) 2 Ca2+ and 8 FF1F1F1S1F1F1F10 
E) 4 Ca2+ and 4 FF1F1F1S1F1F1F10 B

Question 2

Which has the higher boiling point,HCl or HI?

Accepted Answer

HI

Question 3

How many tetrahedral holes are there in a face-centered cubic unit cell?

Accepted Answer

A) 8 
B) 12 
C) 1 
D) 4 
E) 6 
A) 8 
B) 12 
C) 1 
D) 4 
E) 6 A

Question 4

Which answer best accounts for the ClF1F1F1S1F1F1F10 ions present in the NaCl unit cell?

Accepted Answer

A) 1 center atom + 1/2 F1F1F1S1F1F1F10 6 face atoms 
B) 1/8 F1F1F1S1F1F1F10 8 corner atoms + 1/2 F1F1F1S1F1F1F10 6 face atoms 
C) 1 center atom + 1/8 F1F1F1S1F1F1F10 8 corner atoms 
D) 1 center atom + 1/4 F1F1F1S1F1F1F10 12 edge atoms 
E) 1 center atom + 1/8 F1F1F1S1F1F1F10 24 corner atoms 
A) 1 center atom + 1/2 F1F1F1S1F1F1F10 6 face atoms 
B) 1/8 F1F1F1S1F1F1F10 8 corner atoms + 1/2 F1F1F1S1F1F1F10 6 face atoms 
C) 1 center atom + 1/8 F1F1F1S1F1F1F10 8 corner atoms 
D) 1 center atom + 1/4 F1F1F1S1F1F1F10 12 edge atoms 
E) 1 center atom + 1/8 F1F1F1S1F1F1F10 24 corner atoms

Question 5

Molecular solids are held together by weak intermolecular forces.True or false?

Accepted Answer

A) True 
 B)False

Question 6

How many atoms are there in a face-centered cubic unit cell?

Accepted Answer

The answer of How many atoms are there in a...

Question 7

The ability of water to "wet" paper is due to hydrogen bonding between water molecules and surface molecules in the paper.True or false?

Accepted Answer

A) True 
 B)False

Question 8

The boiling points of the Group 15 binary hydrides increase smoothly from NH3 to SbH3.True or false?

Accepted Answer

A) True 
 B)False

Question 9

The atomic radius of zinc is 137 pm.Estimate its density,given that the metal has a close-packed structure.

Accepted Answer

A) 7.47 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
B) 10.2 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
C) 14.0 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
D) 4.49 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
E) 19.2 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
A) 7.47 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
B) 10.2 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
C) 14.0 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
D) 4.49 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
E) 19.2 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103

Question 10

Pentane and 2,2-dimethylpropane have the formula C5H12 and therefore have the same boiling point.True or false?

Accepted Answer

A) True 
 B)False

Question 11

All the elements listed below can exist as network solids except

Accepted Answer

A) O. 
B) Si. 
C) B. 
D) As. 
E) C. 
A) O. 
B) Si. 
C) B. 
D) As. 
E) C.

Question 12

What is the coordination number of cesium in CsCl? The ionic radii of Cs+ and ClF1F1F1S1F1F1F10 are 170 and 181 pm,respectively.

Accepted Answer

A) 12 
B) 8 
C) 2 
D) 4 
E) 6 
A) 12 
B) 8 
C) 2 
D) 4 
E) 6

Question 13

How many titanium and oxygen ions are there in the rutile unit cell shown below?

Accepted Answer

A) 3 Ti4+ and 4 O2F1F1F1S1F1F1F10 
B) 3 Ti4+ and 6 O2F1F1F1S1F1F1F10 
C) 2 Ti4+ and 4 O2F1F1F1S1F1F1F10 
D) 2 Ti4+ and 3 O2F1F1F1S1F1F1F10 
E) 2 Ti4+ and 6 O2F1F1F1S1F1F1F10 
A) 3 Ti4+ and 4 O2F1F1F1S1F1F1F10 
B) 3 Ti4+ and 6 O2F1F1F1S1F1F1F10 
C) 2 Ti4+ and 4 O2F1F1F1S1F1F1F10 
D) 2 Ti4+ and 3 O2F1F1F1S1F1F1F10 
E) 2 Ti4+ and 6 O2F1F1F1S1F1F1F10

Question 14

The solid ZnS has a radius ratio of 0.45 and adopts the zinc-blende structure.What is the coordination number of Zn in ZnS?

Accepted Answer

A) 12 
B) 4 
C) 8 
D) 2 
E) 6 
A) 12 
B) 4 
C) 8 
D) 2 
E) 6

Question 15

Determine the percentage of the total volume that is empty space in a primitive cubic structure in which all the atoms are identical.

Accepted Answer

The answer of Determine the percentage of the total volume...

Question 16

Both ZnS and CaF2 have a face-centered cubic unit cell where the S2F1F1F1S1F1F1F10 and Ca2+ ions are closest packed in each structure.Which of the following is true?

Accepted Answer

A) There are 4 tetrahedral holes empty in each structure. 
B) In both compounds, one-half of the tetrhedral holes are filled. 
C) In both compounds, all the tetrhedral holes are filled. 
D) In ZnS, one-half of the tetrahedral holes are filled by Zn2+ ions, whereas in CaF2 all the tetrahedral holes are filled with FF1F1F1S1F1F1F10 ions. 
E) There are 8 Zn2+ ions and 4 FF1F1F1S1F1F1F10 ions in the unit cell. 
A) There are 4 tetrahedral holes empty in each structure. 
B) In both compounds, one-half of the tetrhedral holes are filled. 
C) In both compounds, all the tetrhedral holes are filled. 
D) In ZnS, one-half of the tetrahedral holes are filled by Zn2+ ions, whereas in CaF2 all the tetrahedral holes are filled with FF1F1F1S1F1F1F10 ions. 
E) There are 8 Zn2+ ions and 4 FF1F1F1S1F1F1F10 ions in the unit cell.

Question 17

What are all the intermolecular forces that are responsible for the existence of ice?

Accepted Answer

A) Dipole-dipole and London forces 
B) London forces 
C) Dipole-dipole, London forces, and hydrogen bonding 
D) Dipole-dipole and ion-ion 
E) Hydrogen bonding and dipole-dipole 
A) Dipole-dipole and London forces 
B) London forces 
C) Dipole-dipole, London forces, and hydrogen bonding 
D) Dipole-dipole and ion-ion 
E) Hydrogen bonding and dipole-dipole

Question 18

Which of the following has the lowest boiling point?

Accepted Answer

A) HF 
B) GeH4  
C) SiH4  
D) PH3  
E) H2Se 
A) HF 
B) GeH4  
C) SiH4  
D) PH3  
E) H2Se

Question 19

Which of the following statements is true?

Accepted Answer

A) A metallic conductor is a substance with a resistance that increases with increasing temperature. 
B) A superconductor is a substance that has zero resistance below a certain temperature. 
C) An insulator is a substance that does not conduct electricity below a certain temperature. 
D) A semiconductor is a substance with a resistance that increases with increasing temperature. 
E) An insulator behaves like a metallic conductor with a very high resistance. 
A) A metallic conductor is a substance with a resistance that increases with increasing temperature. 
B) A superconductor is a substance that has zero resistance below a certain temperature. 
C) An insulator is a substance that does not conduct electricity below a certain temperature. 
D) A semiconductor is a substance with a resistance that increases with increasing temperature. 
E) An insulator behaves like a metallic conductor with a very high resistance.

Question 20

Estimate the density of magnesium oxide from its crystal structure.The radii of Mg2+ and O2F1F1F1S1F1F1F10 are 72 and 140 pm,respectively.

Accepted Answer

A) 3.51 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
B) 14.9 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
C) 21.1 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
D) 1.76 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
E) 0.878 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
A) 3.51 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
B) 14.9 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
C) 21.1 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
D) 1.76 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103  
E) 0.878 gF1F1F1S1F1F1F10cmF1F1F1S1F1F1F103

How many calcium and fluorine ions are there in the fluorite unit cell shown below?

Which has the higher boiling point,HCl or HI?

How many tetrahedral holes are there in a face-centered cubic unit cell?

Which answer best accounts for the Cl^ ions present in the NaCl unit cell?

Molecular solids are held together by weak intermolecular forces.True or false?

How many atoms are there in a face-centered cubic unit cell?

The ability of water to "wet" paper is due to hydrogen bonding between water molecules and surface molecules in the paper.True or false?

The boiling points of the Group 15 binary hydrides increase smoothly from NH₃ to SbH₃.True or false?

The atomic radius of zinc is 137 pm.Estimate its density,given that the metal has a close-packed structure.

Pentane and 2,2-dimethylpropane have the formula C₅H₁₂ and therefore have the same boiling point.True or false?

All the elements listed below can exist as network solids except

What is the coordination number of cesium in CsCl? The ionic radii of Cs⁺ and Cl^ are 170 and 181 pm,respectively.

How many titanium and oxygen ions are there in the rutile unit cell shown below?

The solid ZnS has a radius ratio of 0.45 and adopts the zinc-blende structure.What is the coordination number of Zn in ZnS?

Determine the percentage of the total volume that is empty space in a primitive cubic structure in which all the atoms are identical.

Both ZnS and CaF₂ have a face-centered cubic unit cell where the S²^ and Ca²⁺ ions are closest packed in each structure.Which of the following is true?

What are all the intermolecular forces that are responsible for the existence of ice?

Which of the following has the lowest boiling point?

Which of the following statements is true?

Estimate the density of magnesium oxide from its crystal structure.The radii of Mg²⁺ and O²^ are 72 and 140 pm,respectively.

The Quantum World

Quantum Mechanics in Action: Atoms

Chemical Bonds

Molecular Shape and Structure

The Properties of Gases

Inorganic Materials

Thermodynamics: the First Law

Thermodynamics: the Second and Third Laws

Physical Equilibria

Chemical Equilibria

Acids and Bases

Aqueous Equilibria

Electrochemistry

Chemical Kinetics

The Elements: the Main Group Elements

The Elements: the D Block

Nuclear Chemistry

Organic Chemistry I

Organic Chemistry II

Filters

Exam 6: Liquids and Solids

How many calcium and fluorine ions are there in the fluorite unit cell shown below?

Which has the higher boiling point,HCl or HI?

How many tetrahedral holes are there in a face-centered cubic unit cell?

Which answer best accounts for the Cl ions present in the NaCl unit cell?

Molecular solids are held together by weak intermolecular forces.True or false?

How many atoms are there in a face-centered cubic unit cell?

The ability of water to "wet" paper is due to hydrogen bonding between water molecules and surface molecules in the paper.True or false?

The boiling points of the Group 15 binary hydrides increase smoothly from NH3 to SbH3.True or false?

The atomic radius of zinc is 137 pm.Estimate its density,given that the metal has a close-packed structure.

Pentane and 2,2-dimethylpropane have the formula C5H12 and therefore have the same boiling point.True or false?

All the elements listed below can exist as network solids except

What is the coordination number of cesium in CsCl? The ionic radii of Cs+ and Cl are 170 and 181 pm,respectively.

How many titanium and oxygen ions are there in the rutile unit cell shown below?

The solid ZnS has a radius ratio of 0.45 and adopts the zinc-blende structure.What is the coordination number of Zn in ZnS?

Determine the percentage of the total volume that is empty space in a primitive cubic structure in which all the atoms are identical.

Both ZnS and CaF2 have a face-centered cubic unit cell where the S2 and Ca2+ ions are closest packed in each structure.Which of the following is true?

What are all the intermolecular forces that are responsible for the existence of ice?

Which of the following has the lowest boiling point?

Which of the following statements is true?

Estimate the density of magnesium oxide from its crystal structure.The radii of Mg2+ and O2 are 72 and 140 pm,respectively.

The Quantum World

Quantum Mechanics in Action: Atoms

Chemical Bonds

Molecular Shape and Structure

The Properties of Gases

Inorganic Materials

Thermodynamics: the First Law

Thermodynamics: the Second and Third Laws

Physical Equilibria

Chemical Equilibria

Acids and Bases

Aqueous Equilibria

Electrochemistry

Chemical Kinetics

The Elements: the Main Group Elements

The Elements: the D Block

Nuclear Chemistry

Organic Chemistry I

Organic Chemistry II

Filters

Which answer best accounts for the Cl^ ions present in the NaCl unit cell?

The boiling points of the Group 15 binary hydrides increase smoothly from NH₃ to SbH₃.True or false?

Pentane and 2,2-dimethylpropane have the formula C₅H₁₂ and therefore have the same boiling point.True or false?

What is the coordination number of cesium in CsCl? The ionic radii of Cs⁺ and Cl^ are 170 and 181 pm,respectively.

Both ZnS and CaF₂ have a face-centered cubic unit cell where the S²^ and Ca²⁺ ions are closest packed in each structure.Which of the following is true?

Estimate the density of magnesium oxide from its crystal structure.The radii of Mg²⁺ and O²^ are 72 and 140 pm,respectively.