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?
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
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