Question 1

Which of the following processes is endothermic?

Accepted Answer

A) the reaction associated with the lattice energy of LiCl 
B) the reaction associated with the ionization energy of potassium 
C) the reaction associated with the heat of formation of CaS 
D) the formation of F2 from its elements in their standard states 
E) None of the above processes is endothermic. 
A) the reaction associated with the lattice energy of LiCl 
B) the reaction associated with the ionization energy of potassium 
C) the reaction associated with the heat of formation of CaS 
D) the formation of F2 from its elements in their standard states 
E) None of the above processes is endothermic.

Question 2

Use the data given below to construct a Born-Haber cycle to determine the lattice energy of CaO. $$\begin{array} { l r }
& \Delta H ^ { \circ } \left( \mathrm { kJ } \mathrm { mol } ^ { - } 1 \right)\ 
\mathrm { Ca } ( s ) \rightarrow \mathrm { Ca } ( g ) & 193 \
\mathrm { Ca } ( g ) \rightarrow \mathrm { Ca } ^ { + } ( g ) + \mathrm { e } ^ { - } &590 \
\mathrm { Ca } ^ { + } ( g ) \rightarrow \mathrm { Ca } ^ { + } ( g ) + \mathrm { e } ^ { - } &1010  \
2 \mathrm { O } ( g ) \rightarrow \mathrm { O } _ { 2 } ( g ) & - 498 \
\mathrm { O } ( g ) + \mathrm { e } ^ { - } \rightarrow \mathrm { O } ^ { - } ( g ) & - 141 \
\mathrm { O } ^ { - } ( g ) + \mathrm { e } ^ { - } \rightarrow \mathrm { O } ^ { 2 - } ( g ) & 878 \
\mathrm { Ca } ( s ) + \frac { 1 } { 2 } \mathrm { O } 2 ( g ) \rightarrow \mathrm { CaO } ( s ) & - 635
\end{array}$$

Accepted Answer

A) -3414 kJ mol-1 
B) +1397 kJ mol-1 
C) -2667 kJ mol-1 
D) +3028 kJ mol-1 
E) -2144 kJ mol-1 
A) -3414 kJ mol-1 
B) +1397 kJ mol-1 
C) -2667 kJ mol-1 
D) +3028 kJ mol-1 
E) -2144 kJ mol-1

Question 3

The Lewis structure of acetate ion is as follows:   What is the formal charge on oxygen atom that contains three lone pairs of electrons?

Accepted Answer

The answer of The Lewis structure of acetate ion is...

Question 4

Give the number of lone pairs for BF3.

Accepted Answer

A) 16 
B) 8 
C) 14 
D) 10 
E) 9 
A) 16 
B) 8 
C) 14 
D) 10 
E) 9

Question 5

Draw the Lewis structure for NO2-,including any valid resonance structures.Which of the following statements is TRUE?

Accepted Answer

A) The nitrite ion contains one N-O single bond and one N=O double bond. 
B) The nitrite ion contains two N-O bonds that are equivalent to 1 $\frac{1}{2}$ bonds. 
C) The nitrite ion contains two N=O double bonds. 
D) The nitrite ion contains two N-O single bonds. 
E) None of the above is true. 
A) The nitrite ion contains one N-O single bond and one N=O double bond. 
B) The nitrite ion contains two N-O bonds that are equivalent to 1 $\frac{1}{2}$ bonds. 
C) The nitrite ion contains two N=O double bonds. 
D) The nitrite ion contains two N-O single bonds. 
E) None of the above is true.

Question 6

Identify the complete electronic configuration for Br-.

Accepted Answer

A) 1s22s22p63s23p64s24p6 
B) 1s22s22p63s23p64s24d104p6 
C) 1s22s22p63s23p64s23d104p6 
D) 1s22s22p63s23p64s23d104p5 
E) 1s22s2p63s2p64s23d104p6 
A) 1s22s22p63s23p64s24p6 
B) 1s22s22p63s23p64s24d104p6 
C) 1s22s22p63s23p64s23d104p6 
D) 1s22s22p63s23p64s23d104p5 
E) 1s22s2p63s2p64s23d104p6

Question 7

Which of the following statements is TRUE?

Accepted Answer

A) An ionic bond is much stronger than most covalent bonds. 
B) An ionic bond is formed through the sharing of electrons. 
C) Ionic compounds at room temperature typically conduct electricity. 
D) Once dissolved in water,ionic compounds rarely conduct electricity. 
E) None of the above is true. 
A) An ionic bond is much stronger than most covalent bonds. 
B) An ionic bond is formed through the sharing of electrons. 
C) Ionic compounds at room temperature typically conduct electricity. 
D) Once dissolved in water,ionic compounds rarely conduct electricity. 
E) None of the above is true.

Question 8

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) SrBr2 
A) SrI2 
B) MgF2 
C) CaCl2 
D) SrF2 
E) SrBr2

Question 9

Which of the following resonance structures for OCN- will contribute most to the correct structure of OCN⁻?

Accepted Answer

A) O(2 lone pairs)=C=N(2 lone pairs) 
B) O(1 lone pair)≡C-N(3 lone pairs) 
C) O(1 lone pair)=C(2 lone pairs)=N(1 lone pair) 
D) O(3 lone pairs)-C≡N(1 lone pair) 
E) They all contribute equally to the correct structure of OCN-. 
A) O(2 lone pairs)=C=N(2 lone pairs) 
B) O(1 lone pair)≡C-N(3 lone pairs) 
C) O(1 lone pair)=C(2 lone pairs)=N(1 lone pair) 
D) O(3 lone pairs)-C≡N(1 lone pair) 
E) They all contribute equally to the correct structure of OCN-.

Question 10

Identify the complete electronic configuration for S2-.

Accepted Answer

A) 1s22s22p63s24p6 
B) 1s22s22p63s23p6 
C) 1s22s22p63s23p5 
D) 1s22s23p64s25p6 
E) 1s22s2p63s2p6 
A) 1s22s22p63s24p6 
B) 1s22s22p63s23p6 
C) 1s22s22p63s23p5 
D) 1s22s23p64s25p6 
E) 1s22s2p63s2p6

Question 11

Define formal charge.

Accepted Answer

Formal charge is the charge of

Question 12

Identify the strongest bond.

Accepted Answer

A) single covalent bond 
B) double covalent bond 
C) triple covalent bond 
D) All of the above bonds are the same strength. 
A) single covalent bond 
B) double covalent bond 
C) triple covalent bond 
D) All of the above bonds are the same strength.

Question 13

Describe a covalent bond.

Accepted Answer

A bond for

Question 14

Choose the best Lewis structure for NO3-.

Accepted Answer

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

Question 15

Use the bond energies provided to estimate ΔrH° for the reaction below. C2H4(g)+ H2(g)→ C2H6(g)ΔrH° = ?
Bond $\quad$$\quad$Bond Energy (kJ mol-1)
C-C $\quad$$\quad$$\quad$$\quad$ 347
C-H $\quad$$\quad$$\quad$$\quad$ 414
C=C $\quad$$\quad$$\quad$$\quad$ 611
C≡C $\quad$$\quad$$\quad$$\quad$ 837
H-H $\quad$$\quad$$\quad$$\quad$ 436

Accepted Answer

A) -128 kJ mol-1 
B) +98 kJ mol-1 
C) +700 kJ mol-1 
D) -102 kJ mol-1 
E) -166 kJ mol-1 
A) -128 kJ mol-1 
B) +98 kJ mol-1 
C) +700 kJ mol-1 
D) -102 kJ mol-1 
E) -166 kJ mol-1

Question 16

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

Accepted Answer

A) AlN 
B) MgO 
C) NaF 
D) CaS 
E) RbI 
A) AlN 
B) MgO 
C) NaF 
D) CaS 
E) RbI

Question 17

A triple covalent bond contains ________ of electrons.

Accepted Answer

A) 0 pairs 
B) 1 pair 
C) 2 pairs 
D) 3 pairs 
E) 4 pairs 
A) 0 pairs 
B) 1 pair 
C) 2 pairs 
D) 3 pairs 
E) 4 pairs

Question 18

How many lone pairs are on the Br atom in BrCl2-?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
A) 0 
B) 1 
C) 2 
D) 3

Question 19

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

Accepted Answer

A) RbI > KF > MgS 
B) RbI > MgS > KF 
C) MgS > RbI > KF 
D) KF > RbI > MgS 
E) MgS > KF > RbI 
A) RbI > KF > MgS 
B) RbI > MgS > KF 
C) MgS > RbI > KF 
D) KF > RbI > MgS 
E) MgS > KF > RbI

Question 20

Choose the best Lewis structure for OCl2.

Accepted Answer

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

Exam 9: Chemical Bonding I: Lewis Theory

Which of the following processes is endothermic?

Use the data given below to construct a Born-Haber cycle to determine the lattice energy of CaO. \Delta 1 (s)\rightarrow(g) 193 (g)\rightarrow(g)+ 590 (g)\rightarrow(g)+ 1010 2(g)\rightarrow(g) -498 (g)+\rightarrow(g) -141 (g)+\rightarrow(g) 878 (s)+2(g)\rightarrow(s) -635

The Lewis structure of acetate ion is as follows: What is the formal charge on oxygen atom that contains three lone pairs of electrons?

Give the number of lone pairs for BF3.

Draw the Lewis structure for NO2-,including any valid resonance structures.Which of the following statements is TRUE?

Identify the complete electronic configuration for Br-.

Which of the following statements is TRUE?

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

Which of the following resonance structures for OCN- will contribute most to the correct structure of OCN⁻?

Identify the complete electronic configuration for S2-.

Define formal charge.

Identify the strongest bond.

Describe a covalent bond.

Choose the best Lewis structure for NO3-.

Use the bond energies provided to estimate ΔrH° for the reaction below. C2H4(g)+ H2(g)→ C2H6(g)ΔrH° = ? Bond \quad\quad Bond Energy (kJ mol-1) C-C \quad\quad\quad\quad 347 C-H \quad\quad\quad\quad 414 C=C \quad\quad\quad\quad 611 C≡C \quad\quad\quad\quad 837 H-H \quad\quad\quad\quad 436

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

A triple covalent bond contains ________ of electrons.

How many lone pairs are on the Br atom in BrCl2-?

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

Choose the best Lewis structure for OCl2.

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

Give the number of lone pairs for BF₃.

Draw the Lewis structure for NO₂^-,including any valid resonance structures.Which of the following statements is TRUE?

Identify the complete electronic configuration for Br^-.

Which of the following resonance structures for OCN^- will contribute most to the correct structure of OCN⁻?

Identify the complete electronic configuration for S^2-.

Choose the best Lewis structure for NO₃^-.

How many lone pairs are on the Br atom in BrCl₂^-?

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

Choose the best Lewis structure for OCl₂.