Question 1

Use bond energies to estimate the enthalpy of formation of HBr(g). BE(H-H)= 436 kJ/mol
BE(Br-Br)= 192 kJ/mol
BE(H-Br)= 366 kJ/mol

Accepted Answer

A) +262 kJ/mol 
B) -52 kJ/mol 
C) -104 kJ/mol 
D) +104 kJ/mol 
E) +52 kJ/mol 
A) +262 kJ/mol 
B) -52 kJ/mol 
C) -104 kJ/mol 
D) +104 kJ/mol 
E) +52 kJ/mol B

Question 2

Write a Lewis structure for SO3 that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s).

Accepted Answer

Question 3

The bond in which of the following pairs of atoms would be the least polar (i.e., lowest percent ionic character)?

Accepted Answer

A) C - Cl 
B) C - C 
C) C - H 
D) O - C 
E) N - C 
A) C - Cl 
B) C - C 
C) C - H 
D) O - C 
E) N - C B

Question 4

The formal charge on the sulfur atom in the resonance structure of sulfur dioxide which has one single bond and one double bond is

Accepted Answer

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

Question 5

Which of the following ionic solids would have the largest lattice energy?

Accepted Answer

A) KF 
B) KI 
C) LiF 
D) LiI 
E) NaF 
A) KF 
B) KI 
C) LiF 
D) LiI 
E) NaF

Question 6

What is total number of lone pairs in the best Lewis structure for SOF4 that exceeds the octet rule (S is the central atom)?

Accepted Answer

A) 0 
B) 2 
C) 14 
D) 16 
E) 18 
A) 0 
B) 2 
C) 14 
D) 16 
E) 18

Question 7

What is the formal charge on sulfur in the best Lewis structure for the SCN- (thiocyanate)ion?

Accepted Answer

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

Question 8

Write the Lewis structure for the product that forms when boron trifluoride combines with ammonia.

Accepted Answer

The answer of Write the Lewis structure for the product...

Question 9

Which of the following solids would have the lowest melting point?

Accepted Answer

A) KI 
B) KBr 
C) KCl 
D) KF 
A) KI 
B) KBr 
C) KCl 
D) KF

Question 10

A polar covalent bond would form in which one of the following pairs of atoms?

Accepted Answer

A) Cl - Cl 
B) Si - Si 
C) Ca - Cl 
D) Cr - Br 
E) P - Cl 
A) Cl - Cl 
B) Si - Si 
C) Ca - Cl 
D) Cr - Br 
E) P - Cl

Question 11

What is the formal charge on the singly bonded oxygens in the Lewis structure for the carbonate ion?

Accepted Answer

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

Question 12

Write a Lewis structure for the chlorite ion, ClO2-, that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s).

Accepted Answer

Question 13

Which of the following solids would have the highest melting point?

Accepted Answer

A) NaF 
B) NaCl 
C) NaBr 
D) NaI 
A) NaF 
B) NaCl 
C) NaBr 
D) NaI

Question 14

The Lewis dot symbol for the calcium ion is

Accepted Answer

A)    2+ 
B) (-Ca-) 
C)    2+ 
D) Ca2+ 
E) Ca 
A)    2+ 
B) (-Ca-) 
C)    2+ 
D) Ca2+ 
E) Ca

Question 15

Which one of the following is most likely to be a covalent compound?

Accepted Answer

A) KF 
B) CaCl2 
C) SF4 
D) Al2O3 
E) CaSO4 
A) KF 
B) CaCl2 
C) SF4 
D) Al2O3 
E) CaSO4

Question 16

Which one of the following is most likely to be a covalent compound?

Accepted Answer

A) Rb2O 
B) BaO 
C) SrO 
D) SeO2 
E) MnO2 
A) Rb2O 
B) BaO 
C) SrO 
D) SeO2 
E) MnO2

Question 17

Write a Lewis structure for the phosphate ion, PO43-, that obeys the octet rule, showing all non-zero formal charges, and give the total number of resonance structures for PO43- that obey the octet rule.

Accepted Answer

@#IMG-DLM& Total number of res

Question 18

Use bond energies to estimate the enthalpy change for the reaction of one mole of CH4 with chlorine gas to give CH3Cl and hydrogen chloride. BE(C-H)= 414 kJ/mol
BE(C-Cl)= 326 kJ/mol
BE(H-Cl)= 432 kJ/mol
BE(Cl-Cl)= 243 kJ/mol

Accepted Answer

A) -101 kJ/mol 
B) -106 kJ/mol 
C) +331 kJ/mol 
D) +106 kJ/mol 
E) +101 kJ/mol 
A) -101 kJ/mol 
B) -106 kJ/mol 
C) +331 kJ/mol 
D) +106 kJ/mol 
E) +101 kJ/mol

Question 19

What type of chemical bond holds the atoms together within a water molecule?

Accepted Answer

A) Ionic bond 
B) Nonpolar covalent bond 
C) Polar covalent bond 
D) Coordinate covalent bond 
A) Ionic bond 
B) Nonpolar covalent bond 
C) Polar covalent bond 
D) Coordinate covalent bond

Question 20

The covalent bond with the greatest polarity would form in which of the atom pairs below?

Accepted Answer

A) Br - Br 
B) S - O 
C) C - P 
D) C - O 
E) B - O 
A) Br - Br 
B) S - O 
C) C - P 
D) C - O 
E) B - O

Exam 9: Chemical Bonding I: the Covalent Bond

Use bond energies to estimate the enthalpy of formation of HBr(g). BE(H-H)= 436 kJ/mol BE(Br-Br)= 192 kJ/mol BE(H-Br)= 366 kJ/mol

Write a Lewis structure for SO3 that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s).

The bond in which of the following pairs of atoms would be the least polar (i.e., lowest percent ionic character)?

The formal charge on the sulfur atom in the resonance structure of sulfur dioxide which has one single bond and one double bond is

Which of the following ionic solids would have the largest lattice energy?

What is total number of lone pairs in the best Lewis structure for SOF4 that exceeds the octet rule (S is the central atom)?

What is the formal charge on sulfur in the best Lewis structure for the SCN- (thiocyanate)ion?

Write the Lewis structure for the product that forms when boron trifluoride combines with ammonia.

Which of the following solids would have the lowest melting point?

A polar covalent bond would form in which one of the following pairs of atoms?

What is the formal charge on the singly bonded oxygens in the Lewis structure for the carbonate ion?

Write a Lewis structure for the chlorite ion, ClO2-, that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s).

Which of the following solids would have the highest melting point?

The Lewis dot symbol for the calcium ion is

Which one of the following is most likely to be a covalent compound?

Which one of the following is most likely to be a covalent compound?

Write a Lewis structure for the phosphate ion, PO43-, that obeys the octet rule, showing all non-zero formal charges, and give the total number of resonance structures for PO43- that obey the octet rule.

Use bond energies to estimate the enthalpy change for the reaction of one mole of CH4 with chlorine gas to give CH3Cl and hydrogen chloride. BE(C-H)= 414 kJ/mol BE(C-Cl)= 326 kJ/mol BE(H-Cl)= 432 kJ/mol BE(Cl-Cl)= 243 kJ/mol

What type of chemical bond holds the atoms together within a water molecule?

The covalent bond with the greatest polarity would form in which of the atom pairs below?

Introduction

Atoms, Molecules, and Ions

Stoichiometry

Reactions in Aqueous Solution

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

Write a Lewis structure for SO₃ that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s).

What is total number of lone pairs in the best Lewis structure for SOF₄ that exceeds the octet rule (S is the central atom)?

What is the formal charge on sulfur in the best Lewis structure for the SCN^- (thiocyanate)ion?

Write a Lewis structure for the chlorite ion, ClO₂^-, that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s).

Write a Lewis structure for the phosphate ion, PO₄^3-, that obeys the octet rule, showing all non-zero formal charges, and give the total number of resonance structures for PO₄^3- that obey the octet rule.

Use bond energies to estimate the enthalpy change for the reaction of one mole of CH₄ with chlorine gas to give CH₃Cl and hydrogen chloride. BE(C-H)= 414 kJ/mol BE(C-Cl)= 326 kJ/mol BE(H-Cl)= 432 kJ/mol BE(Cl-Cl)= 243 kJ/mol