Chapter 6
Topic: Enthalpy
Section 6.1
Difficulty Level: Medium
1. Estimate the enthalpy change of the following reaction under standard conditions.
Ans: +8 kJ/mol
Topic: Enthalpy
Section 6.1
Difficulty Level: Medium
2. Estimate the enthalpy change of the following reaction under standard conditions.
Ans: +29 kJ/mol
Topic: Enthalpy
Section 6.1
Difficulty Level: Medium
3. Estimate the enthalpy change of the following reaction under standard conditions.
Ans: -8 kJ/mol
Topic: Enthalpy
Section 6.1
Difficulty Level: Easy
4. Which of the following is the enthalpy change of the following reaction under
standard conditions?
A. -8 kJ/mol
B. +8 kJ/mol
C. +222 kJ/mol
D. +79 kJ/mol
Ans: B
Topic: Enthalpy
Section 6.1
Difficulty Level: Medium
, 5. Which of the following is the enthalpy change of the following reaction under
standard conditions?
A. -8 kJ/mol
B. +8 kJ/mol
C. -506 kJ/mol
D. +63 kJ/mol
Ans: A
Topic: Enthalpy
Section 6.1
Difficulty Level: Medium
6. Later in the course, we will compare the halogenation of differently substituted
carbons, comparing reactions like the ones below. Which of the following
statements is true about reactions A and B?
A. Both reactions have a positive heat of reaction (Ho)
B. Neither reaction has a positive heat of reaction (Ho)
C. Only reaction A has a positive heat of reaction (Ho)
D. Only reaction B has a positive heat of reaction (Ho)
Ans: B
Topic: Enthalpy
Section 6.1
Difficulty Level: Medium
7. Later in the course, we will compare the halogenation of differently substituted
carbons, comparing reactions like the ones below. Which of the following
reactions has a more exothermic heat of reaction (Ho)?
A. Reaction A has a more exothermic heat of reaction (Ho)
B. Reaction B has a more exothermic heat of reaction (Ho)
C. Both reactions have the same heat of reaction (Ho)
Ans: B
,Topic: Enthalpy
Section 6.1
Difficulty Level: Hard
8. You are working in a research laboratory and have developed a new reagent that
cleaves C-H bonds homolytically. Unfortunately, this reagent can achieve only one
of the transformations shown below. In light of bond dissociation energies, which
transformation is most likely to be achieved?
Ans: A
Topic: Enthalpy
Section 6.1
Difficulty Level: Easy
9. What type of bond cleavage does the following reaction involve?
A. homolytic
B. heterolytic
Ans: A
Topic: Enthalpy
Section 6.1
Difficulty Level: Easy
10. What type of bond cleavage does the following reaction involve?
Ans: heterolytic
Topic: Entropy
Section 6.2
Difficulty Level: Easy
11. Predict the sign of S of the following reaction.
, A. positive
B. negative
C. no change
Ans: B
Topic: Entropy
Section 6.2
Difficulty Level: Easy
12. Predict the sign of S of the following reaction.
A. positive
B. negative
C. no change
Ans: A
Topic: Entropy
Section 6.2
Difficulty Level: Easy
13. Predict the sign of S of the following reaction.
A. positive
B. negative
C. no change
Ans: B
Topic: Entropy
Section 6.2
Difficulty Level: Medium
14. Predict the sign of S of the following reaction.
Ans: positive
Topic: Entropy
Section 6.2
Difficulty Level: Medium
Topic: Enthalpy
Section 6.1
Difficulty Level: Medium
1. Estimate the enthalpy change of the following reaction under standard conditions.
Ans: +8 kJ/mol
Topic: Enthalpy
Section 6.1
Difficulty Level: Medium
2. Estimate the enthalpy change of the following reaction under standard conditions.
Ans: +29 kJ/mol
Topic: Enthalpy
Section 6.1
Difficulty Level: Medium
3. Estimate the enthalpy change of the following reaction under standard conditions.
Ans: -8 kJ/mol
Topic: Enthalpy
Section 6.1
Difficulty Level: Easy
4. Which of the following is the enthalpy change of the following reaction under
standard conditions?
A. -8 kJ/mol
B. +8 kJ/mol
C. +222 kJ/mol
D. +79 kJ/mol
Ans: B
Topic: Enthalpy
Section 6.1
Difficulty Level: Medium
, 5. Which of the following is the enthalpy change of the following reaction under
standard conditions?
A. -8 kJ/mol
B. +8 kJ/mol
C. -506 kJ/mol
D. +63 kJ/mol
Ans: A
Topic: Enthalpy
Section 6.1
Difficulty Level: Medium
6. Later in the course, we will compare the halogenation of differently substituted
carbons, comparing reactions like the ones below. Which of the following
statements is true about reactions A and B?
A. Both reactions have a positive heat of reaction (Ho)
B. Neither reaction has a positive heat of reaction (Ho)
C. Only reaction A has a positive heat of reaction (Ho)
D. Only reaction B has a positive heat of reaction (Ho)
Ans: B
Topic: Enthalpy
Section 6.1
Difficulty Level: Medium
7. Later in the course, we will compare the halogenation of differently substituted
carbons, comparing reactions like the ones below. Which of the following
reactions has a more exothermic heat of reaction (Ho)?
A. Reaction A has a more exothermic heat of reaction (Ho)
B. Reaction B has a more exothermic heat of reaction (Ho)
C. Both reactions have the same heat of reaction (Ho)
Ans: B
,Topic: Enthalpy
Section 6.1
Difficulty Level: Hard
8. You are working in a research laboratory and have developed a new reagent that
cleaves C-H bonds homolytically. Unfortunately, this reagent can achieve only one
of the transformations shown below. In light of bond dissociation energies, which
transformation is most likely to be achieved?
Ans: A
Topic: Enthalpy
Section 6.1
Difficulty Level: Easy
9. What type of bond cleavage does the following reaction involve?
A. homolytic
B. heterolytic
Ans: A
Topic: Enthalpy
Section 6.1
Difficulty Level: Easy
10. What type of bond cleavage does the following reaction involve?
Ans: heterolytic
Topic: Entropy
Section 6.2
Difficulty Level: Easy
11. Predict the sign of S of the following reaction.
, A. positive
B. negative
C. no change
Ans: B
Topic: Entropy
Section 6.2
Difficulty Level: Easy
12. Predict the sign of S of the following reaction.
A. positive
B. negative
C. no change
Ans: A
Topic: Entropy
Section 6.2
Difficulty Level: Easy
13. Predict the sign of S of the following reaction.
A. positive
B. negative
C. no change
Ans: B
Topic: Entropy
Section 6.2
Difficulty Level: Medium
14. Predict the sign of S of the following reaction.
Ans: positive
Topic: Entropy
Section 6.2
Difficulty Level: Medium
