Question 1

Which of the following processes is endothermic?

Accepted Answer

A)  K⁺(g) + I⁻(g) → KI(s) 
B)  2 Br(g) → Br2(g) 
C)  Ca(s) → Ca(g) 
D)  2 Na(s) + 2(g)  
C)  Ca(s) → Ca(g)  
D)  2 Na(s) +  O2(g) → Na2O(s)  
E)  None of the above are endothermic." class="answers-bank-image d-inline" rel="preload" >O2(g) → Na2O(s) 
E)  None of the above are endothermic.F) None of the above
G) C) and D)

Question 2

Choose the best Lewis structure for PO43⁻.

Accepted Answer

A)   43⁻. 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
B)   43⁻. 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
C)   43⁻. 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)   43⁻. 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   43⁻. 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >F) All of the above
G) None of the above

Question 3

Place the following in order of decreasing bond length.
H-F H-I H-Br

Accepted Answer

A)  H-F > H-Br > H-I
B)  H-I > H-F > H-Br
C)  H-I > H-Br > H-F
D)  H-Br > H-F > H-I
E)  H-F > H-I > H-BrF) B) and E)
G) A) and D)

Question 4

Draw the best Lewis structure for CH3+.What is the formal charge on the C?

Accepted Answer

A)  0
B)  1
C)  -1
D)  2E) None of the above
F) All of the above

Question 5

Draw the best Lewis structure for the free radical,NO2.What is the formal charge on the N?

Accepted Answer

A)  0
B)  +1
C)  -1
D)  +2
E)  -2F) A) and E)
G) B) and E)

Question 6

Place the following in order of decreasing magnitude of lattice energy.
KF MgS RbI

Accepted Answer

A)  RbI > KF > MgS
B)  RbI > MgS > KF
C)  MgS > RbI > KF
D)  KF > RbI > MgS
E)  MgS > KF > RbIF) A) and D)
G) A) and C)

Question 7

2" class="answers-bank-image d-inline" rel="preload" >
Based on this data,predict which molecule is most polar?

Accepted Answer

A)  ClF
B)  HF
C)  LiF
D)  Cl2E) A) and B)
F) A) and C)

Question 8

Match the following.
-Sr-Sr

Accepted Answer

A)  weakest ionic bond
B)  strongest covalent bond
C)  metallic bond
D)  highest melting point
E)  longest covalent bondF) Na-BrG) C-FH) B) and G)
I) D) and F)

Question 9

In the best Lewis structure for BCl3 ,what is the formal charge on the B atom?

Accepted Answer

A)  -1
B)  0
C)  +1
D)  +2E) A) and D)
F) B) and C)

Question 10

Which of the following processes are exothermic?

Accepted Answer

A)  Cl2(g) → 2Cl(g) 
B)  Br(g) + e⁻ → Br⁻(g) 
C)  Li(s) → Li(g) 
D)  NaF(s) → Na⁺(g) + F⁻(g) 
E)  None of the above are exothermic.F) A) and B)
G) A) and D)

Question 11

Choose the bond below that is most polar.

Accepted Answer

A)  C-N
B)  C-F
C)  C-O
D)  C-C
E)  F-FF) A) and D)
G) A) and E)

Question 12

Which molecule or compound below contains a pure covalent bond?

Accepted Answer

A)  Li2CO3
B)  SCl6
C)  Cl2
D)  PF3
E)  NaClF) None of the above
G) A) and B)

Question 13

How many lone pairs of electrons are on the S atom in SF4?

Accepted Answer

A)  0
B)  1
C)  2
D)  3E) None of the above
F) All of the above

Question 14

Place the following in order of increasing bond length.
C-F C-Br C-Cl

Accepted Answer

A)  C-Br 
B)  C-Cl 
C)  C-F 
D)  C-F 
E)  C-Br < C-F < C-ClF) C) and E)
G) C) and D)

Question 15

Choose the bond below that is the strongest.

Accepted Answer

A)  C-F
B)  C=O
C)  C-I
D)  I-I
E)  C≡NF) All of the above
G) C) and D)

Question 16

Which of the following reactions is associated with the lattice energy of RbI (ΔH°latt) ?

Accepted Answer

A)  Rb(s) + latt) ? 
A)  Rb(s) +  I2(g) → RbI(s)  
B)  RbI(s) → Rb+(g) + I⁻(g)  
C)  RbI(s) → Rb(s) +  I2(g)  
D)  RbI(s) → Rb+(aq) + I⁻(aq)  
E)  Rb⁺(g) + I⁻(g) → RbI(s) " class="answers-bank-image d-inline" rel="preload" >I2(g) → RbI(s) 
B)  RbI(s) → Rb+(g) + I⁻(g) 
C)  RbI(s) → Rb(s) + latt) ? 
A)  Rb(s) +  I2(g) → RbI(s)  
B)  RbI(s) → Rb+(g) + I⁻(g)  
C)  RbI(s) → Rb(s) +  I2(g)  
D)  RbI(s) → Rb+(aq) + I⁻(aq)  
E)  Rb⁺(g) + I⁻(g) → RbI(s) " class="answers-bank-image d-inline" rel="preload" >I2(g) 
D)  RbI(s) → Rb+(aq) + I⁻(aq) 
E)  Rb⁺(g) + I⁻(g) → RbI(s) F) C) and E)
G) A) and B)

Question 17

Choose the bond below that is the strongest.

Accepted Answer

A)  N=O
B)  N-I
C)  N-O
D)  N-S
E)  N=NF) A) and B)
G) A) and C)

Question 18

Which of the following represent the Lewis structure for Br⁻?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) All of the above
G) B) and C)

Question 19

Which of the following statements is true?

Accepted Answer

A)  A covalent bond is formed through the transfer of electrons from one atom to another.
B)  A pair of electrons involved in a covalent bond are sometimes referred to as "lone pairs."
C)  It is not possible for two atoms to share more than two electrons.
D)  Single bonds are shorter than double bonds.
E)  A covalent bond has a lower potential energy than the two separate atoms.F) A) and C)
G) B) and E)

Question 20

Choose the compound below that should have the highest melting point according to the ionic bonding model.

Accepted Answer

A)  SrI2
B)  MgF2
C)  CaCl2
D)  SrF2
E)  SrBr2F) None of the above
G) B) and E)

Exam 9: Chemical Bonding I: Lewis Theory

Place the following in order of increasing bond length. C-F C-Br C-Cl

Correct AnswerverifiedShow Answer

How many lone pairs of electrons are on the S atom in SF4?

Correct AnswerverifiedShow Answer

Which of the following represent the Lewis structure for Br⁻?

Correct AnswerverifiedShow Answer

Match the following. -Sr-Sr

Correct AnswerverifiedShow Answer

Choose the bond below that is most polar.

Correct AnswerverifiedShow Answer

Draw the best Lewis structure for the free radical,NO2.What is the formal charge on the N?

Correct AnswerverifiedShow Answer

Choose the compound below that should have the highest melting point according to the ionic bonding model.

Correct AnswerverifiedShow Answer

Which of the following statements is true?

Correct AnswerverifiedShow Answer

Which of the following processes are exothermic?

Correct AnswerverifiedShow Answer

Place the following in order of decreasing magnitude of lattice energy. KF MgS RbI

Correct AnswerverifiedShow Answer

Choose the bond below that is the strongest.

Correct AnswerverifiedShow Answer

Which of the following reactions is associated with the lattice energy of RbI (ΔH°latt) ?

Correct AnswerverifiedShow Answer

Choose the best Lewis structure for PO43⁻.

Correct AnswerverifiedShow Answer

Based on this data,predict which molecule is most polar?

Correct AnswerverifiedShow Answer

Place the following in order of decreasing bond length. H-F H-I H-Br

Correct AnswerverifiedShow Answer

Which of the following processes is endothermic?

Correct AnswerverifiedShow Answer

In the best Lewis structure for BCl3 ,what is the formal charge on the B atom?

Correct AnswerverifiedShow Answer

Which molecule or compound below contains a pure covalent bond?

Correct AnswerverifiedShow Answer

Draw the best Lewis structure for CH3+.What is the formal charge on the C?

Correct AnswerverifiedShow Answer

Choose the bond below that is the strongest.

Correct AnswerverifiedShow Answer

Correct Answer
verified

How many lone pairs of electrons are on the S atom in SF₄?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Draw the best Lewis structure for the free radical,NO₂.What is the formal charge on the N?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which of the following reactions is associated with the lattice energy of RbI (ΔH°_latt) ?

Correct Answer
verified

Choose the best Lewis structure for PO₄³⁻.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In the best Lewis structure for BCl₃,what is the formal charge on the B atom?

Correct Answer
verified

Correct Answer
verified

Draw the best Lewis structure for CH₃⁺.What is the formal charge on the C?

Correct Answer
verified

Correct Answer
verified