Question 1

Select the compound with the highest lattice energy.

Accepted Answer

A)  CaS( s) 
B)  BaO( s) 
C)  NaI( s) 
D)  LiBr( s) 
E)  MgO( s) F) C) and E)
G) B) and E)

Question 2

Using the bond energies provided below, calculate ΔH° for the reaction CH4(g)  + 4Cl2(g)  → CCl4(g)  + 4HCl(g) 
Bond energies: C-H = 413 kJ/mol, Cl-Cl = 243 kJ/mol, C-Cl = 339 kJ/mol, H-Cl = 427 kJ/mol

Accepted Answer

A)  1422 kJ
B)  440 kJ
C)  110 kJ
D)  −110 kJ
E)  −440 kJF) A) and D)
G) A) and C) E

Question 3

In which of these substances are the atoms held together by metallic bonding?

Accepted Answer

A)  CO 2
B)  Si
C)  Br 2
D)  S 8
E)  CrF) B) and E)
G) A) and E)

Question 4

In covalent bond formation, the potential energy reaches a maximum when the internuclear distance is equal to the bond length.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following compounds displays the greatest ionic character in its bonds?

Accepted Answer

A)  NO 2
B)  CO 2
C)  H 2O
D)  HF
E)  NH 3F) A) and D)
G) A) and C)

Question 6

Which of the following contains ionic bonding?

Accepted Answer

A)  CO
B)  SrF 2
C)  Al
D)  OCl 2
E)  HClF) A) and D)
G) A) and C)

Question 7

The lattice energy for ionic crystals increases as the charge on the ions __________ and the size of the ions __________.

Accepted Answer

A)  increases; increases
B)  increases; decreases
C)  decreases; increases
D)  decreases; decreases
E)  None of these choices are correct.F) C) and E)
G) None of the above

Question 8

Which of the following is an ionic compound?

Accepted Answer

A)  H 2S
B)  NH 3
C)  I 2
D)  KI
E)  CCl 4F) A) and D)
G) C) and D)

Question 9

Which one of the following properties is least characteristic of typical metals?

Accepted Answer

A)  Moderately high melting point
B)  High boiling point
C)  Brittleness
D)  Good electrical conductor when solid
E)  Good electrical conductor when moltenF) C) and D)
G) B) and C)

Question 10

A single covalent bond consists of a single delocalized electron pair.

Accepted Answer

A) True 
 B)False

Question 11

Which one of the following properties is least characteristic of substances composed of small, covalently-bonded molecules?

Accepted Answer

A)  Low melting point
B)  Low boiling point
C)  Weak bonds
D)  Poor electrical conductor when solid
E)  Poor electrical conductor when moltenF) B) and D)
G) A) and C)

Question 12

The lattice energy of large ions is greater in magnitude than that of small ions of the same charge.

Accepted Answer

A) True 
 B)False  False

Question 13

The lattice energy of CaF2 is the energy change for which one, if any, of the following processes?

Accepted Answer

A)  Ca 2+( s) + 2F −( g) → CaF 2( g) 
B)  CaF 2( g) → CaF 2( s) 
C)  Ca( g) + 2F( g) → CaF 2( s) 
D)  CaF 2( aq) → CaF 2( s) 
E)  None of these choices are correct.F) A) and D)
G) A) and B)

Question 14

Select the most polar bond amongst the following.

Accepted Answer

A)  C-O
B)  Si-F
C)  Cl-F
D)  C-F
E)  C-IF) A) and B)
G) B) and D)

Question 15

When one mole of each of the following liquids is burned, which will produce the most heat energy?

Accepted Answer

A)  C 6H 14
B)  C 5H 12
C)  C 6H 14O
D)  C 6H 12O
E)  C 6H 10O 3F) B) and C)
G) All of the above

Question 16

Which of the following elements is the most electronegative?

Accepted Answer

A)  Ne
B)  Rb
C)  P
D)  I
E)  ClF) All of the above
G) A) and C)

Question 17

Select the strongest bond in the following group.

Accepted Answer

A)  C-S
B)  C-O
C)  C=C
D)  C≡N
E)  C-FF) C) and D)
G) All of the above D

Question 18

Acetone can be easily converted to isopropyl alcohol by addition of hydrogen to the carbon-oxygen double bond. Calculate the enthalpy of reaction using the bond energies given.

Accepted Answer

A)  −484 kJ
B)  −366 kJ
C)  −61 kJ
D)  +61 kJ
E)  +366 kJF) D) and E)
G) B) and E)

Question 19

Select the compound with the lowest (i.e., least negative)  lattice energy.

Accepted Answer

A)  CsBr( s) 
B)  NaCl( s) 
C)  SrO( s) 
D)  CaO( s) 
E)  KBr( s) F) A) and B)
G) All of the above

Question 20

Which of the following is a covalent compound?

Accepted Answer

A)  Na 2O
B)  CaCl 2
C)  Cl 2O
D)  CsCl
E)  Al 2O 3F) A) and D)
G) C) and E)

Exam 9: Models of Chemical Bonding

Select the compound with the highest lattice energy.

Correct AnswerverifiedShow Answer

Using the bond energies provided below, calculate ΔH° for the reaction CH4(g) + 4Cl2(g) → CCl4(g) + 4HCl(g) Bond energies: C-H = 413 kJ/mol, Cl-Cl = 243 kJ/mol, C-Cl = 339 kJ/mol, H-Cl = 427 kJ/mol

Correct AnswerverifiedE

In which of these substances are the atoms held together by metallic bonding?

Correct AnswerverifiedShow Answer

In covalent bond formation, the potential energy reaches a maximum when the internuclear distance is equal to the bond length.

Correct AnswerverifiedShow Answer

Which of the following compounds displays the greatest ionic character in its bonds?

Correct AnswerverifiedShow Answer

Which of the following contains ionic bonding?

Correct AnswerverifiedShow Answer

The lattice energy for ionic crystals increases as the charge on the ions __________ and the size of the ions __________.

Correct AnswerverifiedShow Answer

Which of the following is an ionic compound?

Correct AnswerverifiedShow Answer

Which one of the following properties is least characteristic of typical metals?

Correct AnswerverifiedShow Answer

A single covalent bond consists of a single delocalized electron pair.

Correct AnswerverifiedShow Answer

Which one of the following properties is least characteristic of substances composed of small, covalently-bonded molecules?

Correct AnswerverifiedShow Answer

The lattice energy of large ions is greater in magnitude than that of small ions of the same charge.

Correct AnswerverifiedFalse

The lattice energy of CaF2 is the energy change for which one, if any, of the following processes?

Correct AnswerverifiedShow Answer

Select the most polar bond amongst the following.

Correct AnswerverifiedShow Answer

When one mole of each of the following liquids is burned, which will produce the most heat energy?

Correct AnswerverifiedShow Answer

Which of the following elements is the most electronegative?

Correct AnswerverifiedShow Answer

Select the strongest bond in the following group.

Correct AnswerverifiedD

Acetone can be easily converted to isopropyl alcohol by addition of hydrogen to the carbon-oxygen double bond. Calculate the enthalpy of reaction using the bond energies given.

Correct AnswerverifiedShow Answer

Select the compound with the lowest (i.e., least negative) lattice energy.

Correct AnswerverifiedShow Answer

Which of the following is a covalent compound?

Correct AnswerverifiedShow Answer

Correct Answer
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Using the bond energies provided below, calculate ΔH° for the reaction CH₄(g) + 4Cl₂(g) → CCl₄(g) + 4HCl(g) Bond energies: C-H = 413 kJ/mol, Cl-Cl = 243 kJ/mol, C-Cl = 339 kJ/mol, H-Cl = 427 kJ/mol

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E

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The lattice energy for ionic crystals increases as the charge on the ions and the size of the ions .

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False

The lattice energy of CaF₂ is the energy change for which one, if any, of the following processes?

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D

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