Question 1

Place the following elements in order of increasing electronegativity. 
Sr$\quad$ N $\quad$Na

Accepted Answer

A) Sr < Na < N 
B) Na < N < Sr 
C) Sr < N < Na 
D) N < Sr < Na 
E) N < Na < Sr 
A) Sr < Na < N 
B) Na < N < Sr 
C) Sr < N < Na 
D) N < Sr < Na 
E) N < Na < Sr A

Question 2

Using Lewis structures and formal charge,which of the following ions is most stable? 
OCN- $\quad$ONC- $\quad$NOC-

Accepted Answer

A) OCN- 
B) ONC- 
C) NOC- 
D) None of these ions is stable according to Lewis theory. 
A) OCN- 
B) ONC- 
C) NOC- 
D) None of these ions is stable according to Lewis theory. A

Question 3

Which molecule or compound below contains a polar covalent bond?

Accepted Answer

A) C2H4 
B) ZnS 
C) LiI 
D) NCl3 
E) AgCl 
A) C2H4 
B) ZnS 
C) LiI 
D) NCl3 
E) AgCl D

Question 4

The compound ClF  contains

Accepted Answer

A) ionic bonds. 
B) nonpolar covalent bonds. 
C) polar covalent bonds with partial negative charges on the F atoms. 
D) polar covalent bonds with partial negative charges on the Cl atoms. 
A) ionic bonds. 
B) nonpolar covalent bonds. 
C) polar covalent bonds with partial negative charges on the F atoms. 
D) polar covalent bonds with partial negative charges on the Cl atoms.

Question 5

Choose the bond below that is the weakest.

Accepted Answer

A) C≡O 
B) N≡N 
C) C-I 
D) C=S 
E) K-Cl 
A) C≡O 
B) N≡N 
C) C-I 
D) C=S 
E) K-Cl

Question 6

Identify the compound or element with metallic bonding.

Accepted Answer

A) NaCl 
B) Li 
C) H2O 
D) He 
E) S 
A) NaCl 
B) Li 
C) H2O 
D) He 
E) S

Question 7

Which of the following represent the Lewis structure for Ca2+?

Accepted Answer

A)  $\mathrm { Ca } : ^ { 2 + }$ 
B)  $\text { Ca: }$ 
C)    
D)    
E)  $\mathrm { Ca } ^ { 2 + }$ 
A)  $\mathrm { Ca } : ^ { 2 + }$ 
B)  $\text { Ca: }$ 
C)    
D)    
E)  $\mathrm { Ca } ^ { 2 + }$

Question 8

Choose the best Lewis structure for SO42-.

Accepted Answer

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

Question 9

Choose the bond below that is least polar.

Accepted Answer

A) P-F 
B) C-Br 
C) C-F 
D) C-I 
E) C-Cl 
A) P-F 
B) C-Br 
C) C-F 
D) C-I 
E) C-Cl

Question 10

Identify the number of valence electrons for XeI2.

Accepted Answer

A) 22 
B) 20 
C) 18 
D) 24 
A) 22 
B) 20 
C) 18 
D) 24

Question 11

Identify the substance that conducts electricity.

Accepted Answer

A) NaCl dissolved in water 
B) solid NaCl 
C) water 
D) solid sugar 
E) sugar dissolved in water 
A) NaCl dissolved in water 
B) solid NaCl 
C) water 
D) solid sugar 
E) sugar dissolved in water

Question 12

The Lewis structure of BrO3- is as follows:   What is the formal charge on Br atom?

Accepted Answer

Question 13

Choose the bond below that is the weakest.

Accepted Answer

A) Na-Cl 
B) I-I 
C) C=N 
D) Li-F 
E) C=O 
A) Na-Cl 
B) I-I 
C) C=N 
D) Li-F 
E) C=O

Question 14

Using periodic trends,place the following bonds in order of increasing ionic character. 
Si-P $\quad$Si-Cl $\quad$Si-S

Accepted Answer

A) Si-P < Si-Cl < Si-S 
B) Si-P < Si-S < Si-Cl 
C) Si-S < Si-Cl < Si-P 
D) Si-Cl < Si-P < Si-S 
E) Si-Cl < Si-S < Si-P 
A) Si-P < Si-Cl < Si-S 
B) Si-P < Si-S < Si-Cl 
C) Si-S < Si-Cl < Si-P 
D) Si-Cl < Si-P < Si-S 
E) Si-Cl < Si-S < Si-P

Question 15

Which of the following processes is 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 processes is exothermic. 
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 processes is exothermic.

Question 16

Choose the best Lewis structure for SeO42-.

Accepted Answer

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

Question 17

Draw the Lewis dot structure for Al3+.

Accepted Answer

The Al should have n

Question 18

Use the bond energies provided to estimate ΔrH° for the reaction below. 
XeF2 + 2F2 → XeF6 ΔrH° = ?
Bond $\quad$$\quad$Bond Energy (kJ mol-1)
Xe-F $\quad$$\quad$$\quad$$\quad$147
F-F $\quad$$\quad$$\quad$$\quad$ 159

Accepted Answer

A) -429 kJ mol-1 
B) +159 kJ mol-1 
C) -660 kJ mol-1 
D) +176 kJ mol-1 
E) -270 kJ mol-1 
A) -429 kJ mol-1 
B) +159 kJ mol-1 
C) -660 kJ mol-1 
D) +176 kJ mol-1 
E) -270 kJ mol-1

Question 19

Give the number of valence electrons for SF4.

Accepted Answer

A) 28 
B) 30 
C) 32 
D) 34 
A) 28 
B) 30 
C) 32 
D) 34

Question 20

Use the data given below to construct a Born-Haber cycle to determine the second ionization energy of Ca. 
$$\begin{array} { l c } 
& \Delta H ^ { \circ } \left( \mathrm { kJ } \mathrm { mol } ^ { - 1 } \right) \
\mathrm { Ca } ( s ) \rightarrow \mathrm { Ca } ( g ) & 193 \
\mathrm { Ca } ( g ) \rightarrow \mathrm { Ca } ^ { + } ( g ) + \mathrm { e } ^ { - } & 590 \
2 \mathrm { O } ( g ) \rightarrow \mathrm { O } _ { 2 } ( g ) & - 498 \
\mathrm { O } ( g ) + \mathrm { e } ^ { - } \rightarrow \mathrm { O } ^ { - } ( g ) & - 141 \
\mathrm { O } ^ { - } ( g ) + \mathrm { e } ^ { - } \rightarrow \mathrm { O } ^ { 2 - } ( g ) & 878 \
\mathrm { Ca } ( s ) + \frac { 1 } { 2 } \mathrm { O } _ { 2 } ( g ) \rightarrow \mathrm { CaO } ( s ) & - 635 \
\mathrm { Ca } ^ { 2 + } ( g ) + \mathrm { O } ^ { 2 - } ( g ) \rightarrow \mathrm { CaO } ( s ) & - 3414
\end{array}$$

Accepted Answer

A) 1010 kJ mol-1 
B) 1757 kJ mol-1 
C) 1508 kJ mol-1 
D) -3027 kJ mol-1 
E) -1514 kJ mol-1 
A) 1010 kJ mol-1 
B) 1757 kJ mol-1 
C) 1508 kJ mol-1 
D) -3027 kJ mol-1 
E) -1514 kJ mol-1

Exam 9: Chemical Bonding I: Lewis Theory

Place the following elements in order of increasing electronegativity. Sr \quad N \quad Na

Using Lewis structures and formal charge,which of the following ions is most stable? OCN- \quad ONC- \quad NOC-

Which molecule or compound below contains a polar covalent bond?

The compound ClF contains

Choose the bond below that is the weakest.

Identify the compound or element with metallic bonding.

Which of the following represent the Lewis structure for Ca2+?

Choose the best Lewis structure for SO42-.

Choose the bond below that is least polar.

Identify the number of valence electrons for XeI2.

Identify the substance that conducts electricity.

The Lewis structure of BrO3- is as follows: What is the formal charge on Br atom?

Choose the bond below that is the weakest.

Using periodic trends,place the following bonds in order of increasing ionic character. Si-P \quad Si-Cl \quad Si-S

Which of the following processes is exothermic?

Choose the best Lewis structure for SeO42-.

Draw the Lewis dot structure for Al3+.

Use the bond energies provided to estimate ΔrH° for the reaction below. XeF2 + 2F2 → XeF6 ΔrH° = ? Bond \quad\quad Bond Energy (kJ mol-1) Xe-F \quad\quad\quad\quad 147 F-F \quad\quad\quad\quad 159

Give the number of valence electrons for SF4.

Use the data given below to construct a Born-Haber cycle to determine the second ionization energy of Ca. \Delta (s)\rightarrow(g) 193 (g)\rightarrow(g)+ 590 2(g)\rightarrow(g) -498 (g)+\rightarrow(g) -141 (g)+\rightarrow(g) 878 (s)+(g)\rightarrow(s) -635 (g)+(g)\rightarrow(s) -3414

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Molecules,compounds,and Nomenclature

Chemical Reactions and Stoichiometry

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding II: Molecular Shapes, valence Bond Theory, and Molecular Orbital Theory

Liquids, solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry II: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

Place the following elements in order of increasing electronegativity. Sr $\quad$ N $\quad$ Na

Using Lewis structures and formal charge,which of the following ions is most stable? OCN^- $\quad$ ONC^- $\quad$ NOC^-

Which of the following represent the Lewis structure for Ca²⁺?

Choose the best Lewis structure for SO₄²^-.

Identify the number of valence electrons for XeI₂.

The Lewis structure of BrO₃^- is as follows: What is the formal charge on Br atom?

Using periodic trends,place the following bonds in order of increasing ionic character. Si-P $\quad$ Si-Cl $\quad$ Si-S

Choose the best Lewis structure for SeO₄²^-.

Draw the Lewis dot structure for Al³⁺.

Use the bond energies provided to estimate Δ_rH° for the reaction below. XeF₂₊2F₂ → XeF₆ Δ_rH°= ? Bond $\quad$ $\quad$ Bond Energy (kJ mol^-1) Xe-F $\quad$ $\quad$ $\quad$ $\quad$ 147 F-F $\quad$ $\quad$ $\quad$ $\quad$ 159

Give the number of valence electrons for SF₄.