1. Chemical Bonding I: Lewis Theory
Chemistry: A Molecular Approach, 1st Edition
Nivaldo J. Tro
Chapter 9
Chemical Bonding I: Lewis Theory

2. Tro Chemistry: A Molecular Approach
Which of the following compounds will have the highest magnitude lattice energy value?
KBr
NaBr
LiBr
RbBr
All are the same.
There is not enough information to compare.
Tro Chemistry: A Molecular Approach

3. Tro Chemistry: A Molecular Approach
Which of the following compounds will have the highest magnitude lattice energy value?
KBr
NaBr
LiBr
RbBr
All are the same.
There is not enough information to compare.
Tro Chemistry: A Molecular Approach

4. Tro Chemistry: A Molecular Approach
Calculate the percent ionic character of a diatomic molecule with a bond length of 145 pm that has a dipole moment of 5.2 D.
52 %
45 %
75 %
70 %
85 %
Tro Chemistry: A Molecular Approach

5. Tro Chemistry: A Molecular Approach
Calculate the percent ionic character of a diatomic molecule with a bond length of 145 pm that has a dipole moment of 5.2 D.
52 %
45 %
75 %
70 %
85 %
Tro Chemistry: A Molecular Approach

6. Tro Chemistry: A Molecular Approach
Which of the following sets gives the correct formal charges for the elements in the Lewis structure below?
S: –2 C: – N: –3
S: +6 C: N: +5
S: +1 C: N: –1
S: 0 C: N: –1
Tro Chemistry: A Molecular Approach

7. Tro Chemistry: A Molecular Approach
Which of the following sets gives the correct formal charges for the elements in the Lewis structure below?
S: –2 C: – N: –3
S: +6 C: N: +5
S: +1 C: N: –1
S: 0 C: N: –1
Tro Chemistry: A Molecular Approach

8. Tro Chemistry: A Molecular Approach
Using average bond energies, calculate ΔHrxn for the combustion of acetylene.
Bond
Bond Energy (kJ/ mol)
C─H
414
C─C
347
C≡C
837
O═O
498
C═O in CO2
799
O─H
464
+1359 kJ
–1359 kJ
+7408 kJ
–7408 kJ
–510 kJ
Tro Chemistry: A Molecular Approach

9. Tro Chemistry: A Molecular Approach
Using average bond energies, calculate ΔHrxn for the combustion of acetylene.
Bond
Bond Energy (kJ/ mol)
C─H
414
C─C
347
C≡C
837
O═O
498
C═O in CO2
799
O─H
464
+1359 kJ
–1359 kJ
+7408 kJ
–7408 kJ
–510 kJ
Tro Chemistry: A Molecular Approach

10. Tro Chemistry: A Molecular Approach
Rank the following in order of increasing bond polarity: H─F H─Br F─F Na─Cl
H─F < H─Br < F─F < Na─Cl
F─F < H─F < H─Br < Na─Cl
H─Br < H─F < F─F < Na─Cl
F─F < H─Br < H─F < Na─Cl
Na─Cl < H─F < H─Br < F─F
Tro Chemistry: A Molecular Approach

11. Tro Chemistry: A Molecular Approach
Rank the following in order of increasing bond polarity: H─F H─Br F─F Na─Cl
H─F < H─Br < F─F < Na─Cl
F─F < H─F < H─Br < Na─Cl
H─Br < H─F < F─F < Na─Cl
F─F < H─Br < H─F < Na─Cl
Na─Cl < H─F < H─Br < F─F
Tro Chemistry: A Molecular Approach