Question 1

Describe the difference between a pure covalent bond and a polar covalent bond.

Accepted Answer

A pure covalent bond occurs when bonding

Question 2

List the most electronegative atom.

Accepted Answer

The answer of List the most electronegative atom....

Question 3

List the least electronegative atom.

Accepted Answer

The answer of List the least electronegative atom....

Question 4

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-Br 
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-Br

Question 5

In the best Lewis structure for CN-, what is the formal charge on the N atom?

Accepted Answer

A) -1 
B) 0 
C) +1 
D) +2 
A) -1 
B) 0 
C) +1 
D) +2

Question 6

Match the following.

-Cs-I

Accepted Answer

A) longest covalent bond 
B) metallic bond 
C) strongest covalent bond 
D) weakest ionic bond 
E) highest melting point 
A) longest covalent bond 
B) metallic bond 
C) strongest covalent bond 
D) weakest ionic bond 
E) highest melting point

Question 7

Choose the best Lewis structure for SO42⁻.

Accepted Answer

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

Question 8

Which of the following reactions is associated with the lattice energy of CaS (Δr     )?

Accepted Answer

A) Ca(s)+ S(s)→ CaS(s) 
B) CaS(s)→ Ca(s)+ S(s) 
C) Ca2⁺(aq)+ S2⁻(aq)→ CaS(s) 
D) Ca2⁺(g)+ S2⁻(g)→ CaS(s) 
E) CaS(s)→ Ca2⁺(aq)+ S2⁻(aq) 
A) Ca(s)+ S(s)→ CaS(s) 
B) CaS(s)→ Ca(s)+ S(s) 
C) Ca2⁺(aq)+ S2⁻(aq)→ CaS(s) 
D) Ca2⁺(g)+ S2⁻(g)→ CaS(s) 
E) CaS(s)→ Ca2⁺(aq)+ S2⁻(aq)

Question 9

Which of the following elements can form hypercoordinate compounds?

Accepted Answer

A) N 
B) Br 
C) F 
D) Be 
E) None of the above can form compounds with an expanded octet. 
A) N 
B) Br 
C) F 
D) Be 
E) None of the above can form compounds with an expanded octet.

Question 10

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 11

Which of the following reactions is associated with the lattice energy of RbI (Δr NEWLINE   )?

Accepted Answer

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) 
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)

Question 12

Match the following.

-Ca-O

Accepted Answer

A) longest covalent bond 
B) metallic bond 
C) strongest covalent bond 
D) weakest ionic bond 
E) highest melting point 
A) longest covalent bond 
B) metallic bond 
C) strongest covalent bond 
D) weakest ionic bond 
E) highest melting point

Question 13

Match the following.

-Sr-Sr

Accepted Answer

A) longest covalent bond 
B) metallic bond 
C) strongest covalent bond 
D) weakest ionic bond 
E) highest melting point 
A) longest covalent bond 
B) metallic bond 
C) strongest covalent bond 
D) weakest ionic bond 
E) highest melting point

Question 14

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 15

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. 
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.

Question 16

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

Question 17

Identify the longest bond.

Accepted Answer

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

Question 18

Place the following elements in order of decreasing electronegativity. S Cl Se

Accepted Answer

A) Se > S > Cl 
B) Cl > Se > S 
C) Se > Cl > S 
D) S > Cl > Se 
E) Cl > S > Se 
A) Se > S > Cl 
B) Cl > Se > S 
C) Se > Cl > S 
D) S > Cl > Se 
E) Cl > S > Se

Question 19

Use the bond energies provided to estimate ΔrH° for the reaction below. XeF2 + 2F2 → XeF6 ΔrH° = ?
Bond Bond Energy (kJ mol-1)
Xe-F 147
F-F 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 20

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   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   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.

Exam 9: Chemical Bonding I: Lewis Theory

Describe the difference between a pure covalent bond and a polar covalent bond.

List the most electronegative atom.

List the least electronegative atom.

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

In the best Lewis structure for CN-, what is the formal charge on the N atom?

Match the following. -Cs-I

Choose the best Lewis structure for SO42⁻.

Which of the following reactions is associated with the lattice energy of CaS (Δr )?

Which of the following elements can form hypercoordinate compounds?

Choose the bond below that is least polar.

Which of the following reactions is associated with the lattice energy of RbI (Δr NEWLINE )?

Match the following. -Ca-O

Match the following. -Sr-Sr

Choose the bond below that is the weakest.

Which of the following statements is TRUE?

Which molecule or compound below contains a polar covalent bond?

Identify the longest bond.

Place the following elements in order of decreasing electronegativity. S Cl Se

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

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

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 Metallury

Transition Metals and Coordination Compounds

Filters

In the best Lewis structure for CN^-, what is the formal charge on the N atom?

Choose the best Lewis structure for SO₄²⁻.

Which of the following reactions is associated with the lattice energy of CaS (Δ_r )?

Which of the following reactions is associated with the lattice energy of RbI (Δ_r _N_EWLINE )?

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

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