Question 1

Identify the weakest 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 2

Choose the best Lewis structure for XeI2.

Accepted Answer

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

Question 3

Identify the number of bonding pairs and lone pairs of electrons in water.

Accepted Answer

A) 1 bonding pair and 1 lone pair 
B) 1 bonding pair and 2 lone pairs 
C) 2 bonding pairs and 2 lone pairs 
D) 2 bonding pairs and 1 lone pair 
E) 3 bonding pairs and 2 lone pairs 
A) 1 bonding pair and 1 lone pair 
B) 1 bonding pair and 2 lone pairs 
C) 2 bonding pairs and 2 lone pairs 
D) 2 bonding pairs and 1 lone pair 
E) 3 bonding pairs and 2 lone pairs

Question 4

Choose the best Lewis structure for BeF2.

Accepted Answer

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

Question 5

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 6

Use the bond energies provided to estimate ΔrH° for the reaction below. CH3OH(l)+ 2O2(g)→ CO2(g)+ 2H2O(g)ΔrH° = ?
Bond Bond Energy (kJ mol-1)
C-H 414
C-O 360
C=O 799
O=O 498
O-H 464

Accepted Answer

A) +473 kJ mol-1 
B) -91 kJ mol-1 
C) -486 kJ mol-1 
D) -392 kJ mol-1 
E) +206 kJ mol-1 
A) +473 kJ mol-1 
B) -91 kJ mol-1 
C) -486 kJ mol-1 
D) -392 kJ mol-1 
E) +206 kJ mol-1

Question 7

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 8

Which of the following represent the Lewis structure for Mg?

Accepted Answer

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

Question 9

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 10

Choose the bond below that is the strongest.

Accepted Answer

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

Question 11

Use Lewis theory to determine the chemical formula for the compound formed between Mg and Br.

Accepted Answer

A) MgBr 
B) Mg2Br3 
C) Mg3Br2 
D) MgBr2 
E) Mg2Br 
A) MgBr 
B) Mg2Br3 
C) Mg3Br2 
D) MgBr2 
E) Mg2Br

Question 12

Define formal charge.

Accepted Answer

Formal charge is the charge of

Question 13

Give the number of pairs of valence electrons for BF3.

Accepted Answer

A) 16 
B) 8 
C) 14 
D) 10 
E) 12 
A) 16 
B) 8 
C) 14 
D) 10 
E) 12

Question 14

Describe a covalent bond.

Accepted Answer

A bond for

Question 15

How many of the following elements can form hypercoordinate compounds? I O Cl Xe

Accepted Answer

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

Question 16

Of the following elements, which has the lowest electronegativity?

Accepted Answer

A) Sr 
B) I 
C) Ba 
D) At 
A) Sr 
B) I 
C) Ba 
D) At

Question 17

Which of the following processes is endothermic?

Accepted Answer

A) K⁺(g)+ I⁻(g)→ KI(s) 
B) 2Br(g)→ Br2(g) 
C) Ca(s)→ Ca(g) 
D) 2Na(s)+   O2(g)→ Na2O(s) 
E) None of the above processes is endothermic. 
A) K⁺(g)+ I⁻(g)→ KI(s) 
B) 2Br(g)→ Br2(g) 
C) Ca(s)→ Ca(g) 
D) 2Na(s)+   O2(g)→ Na2O(s) 
E) None of the above processes is endothermic.

Question 18

Use the data given below to construct a Born-Haber cycle to determine the electron affinity of Br. ΔH°(kJ mol-1)
K(s)→ K(g)89
K(g)→ K⁺(g)+ e⁻ 419
Br2(l)→ 2Br(g)193
K(s)+   Br2(g)→ KBr (s)-394
KBr(s)→ K⁺(g)+ Br⁻(g)674

Accepted Answer

A) -885 kJ 
B) -325 kJ 
C) +367 kJ 
D) -464 kJ 
E) +246 kJ 
A) -885 kJ 
B) -325 kJ 
C) +367 kJ 
D) -464 kJ 
E) +246 kJ

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

How many lone pairs of electrons are on the As atom in AsCl3?

Accepted Answer

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

Exam 9: Chemical Bonding I: Lewis Theory

Identify the weakest bond.

Choose the best Lewis structure for XeI2.

Identify the number of bonding pairs and lone pairs of electrons in water.

Choose the best Lewis structure for BeF2.

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

Use the bond energies provided to estimate ΔrH° for the reaction below. CH3OH(l)+ 2O2(g)→ CO2(g)+ 2H2O(g)ΔrH° = ? Bond Bond Energy (kJ mol-1) C-H 414 C-O 360 C=O 799 O=O 498 O-H 464

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

Which of the following represent the Lewis structure for Mg?

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

Choose the bond below that is the strongest.

Use Lewis theory to determine the chemical formula for the compound formed between Mg and Br.

Define formal charge.

Give the number of pairs of valence electrons for BF3.

Describe a covalent bond.

How many of the following elements can form hypercoordinate compounds? I O Cl Xe

Of the following elements, which has the lowest electronegativity?

Which of the following processes is endothermic?

Use the data given below to construct a Born-Haber cycle to determine the electron affinity of Br. ΔH°(kJ mol-1) K(s)→ K(g)89 K(g)→ K⁺(g)+ e⁻ 419 Br2(l)→ 2Br(g)193 K(s)+ Br2(g)→ KBr (s)-394 KBr(s)→ K⁺(g)+ Br⁻(g)674

Give the number of valence electrons for SF4.

How many lone pairs of electrons are on the As atom in AsCl3?

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

Choose the best Lewis structure for XeI₂.

Choose the best Lewis structure for BeF₂.

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

Use the bond energies provided to estimate Δ_rH° for the reaction below. CH₃OH(l)+ 2O₂(g)→ CO₂(g)+ 2H₂O(g)Δ_rH°= ? Bond Bond Energy (kJ mol^-1) C-H 414 C-O 360 C=O 799 O=O 498 O-H 464

Give the number of pairs of valence electrons for BF₃.

Use the data given below to construct a Born-Haber cycle to determine the electron affinity of Br. ΔH°(kJ mol^-1) K(s)→ K(g)89 K(g)→ K⁺(g)+ e⁻ 419 Br₂(l)→ 2Br(g)193 K(s)+ Br₂(g)→ KBr (s)-394 KBr(s)→ K⁺(g)+ Br⁻(g)674

Give the number of valence electrons for SF₄.

How many lone pairs of electrons are on the As atom in AsCl₃?