Question 1

Using Table 6.1, estimate the enthalpy change of the following reaction under standard conditions.

Accepted Answer

The answer of Using Table 6.1, estimate the enthalpy change...

Question 2

Which of the following energy diagrams shows a concerted endothermic reaction?

Accepted Answer

A)  
B)  
C)  
D)

Question 3

Draw curved arrows for the following mechanistic step.

Accepted Answer

<img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30">_TB4454_00 6.10 Desc...

Question 4

Does a reaction with a ∆H of 20 kJ/mol and a ∆S of 10 J/mol·K at 298 K favor reactants or products?

Accepted Answer

The answer of Does a reaction with a ∆H of...

Question 5

What is the energy of activation for the following reaction?

Accepted Answer

10 kJ/mol

Question 6

Why is the entropy change negative for ring closures?

Accepted Answer

A)   Closing a ring results in fewer molecules.
B)   Closing a ring results in more molecules.
C)   Closing a ring releases energy.
D)   Closing a ring restricts the rotation around individual carbon-carbon bonds.

Question 7

Predict the sign of ∆G for an exothermic reaction with a decrease in entropy.

Accepted Answer

A)   positive
B)   negative
C)   no change
D)   cannot predict without additional information

Question 8

Does a reaction with a Keq = 10 favor reactants or products?

Accepted Answer

Question 9

In a homolytic bond cleavage, ____ are formed.

Accepted Answer

A)   ions
B)   radicals
C)   only cations
D)   only anions

Question 10

Which of the following indicates a reaction with a negative ∆G?

Accepted Answer

A)   endergonic, spontaneous
B)   endergonic, not spontaneous
C)   exergonic, spontaneous
D)   exergonic, not spontaneous

Question 11

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) ? o) ?   A)  Reaction I has a more exothermic heat of reaction (∆Ho)  B)  Reaction II has a more exothermic heat of reaction (∆Ho)  C)  Both reactions have the same heat of reaction (∆Ho) " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   Reaction I has a more exothermic heat of reaction (∆Ho) 
B)   Reaction II has a more exothermic heat of reaction (∆Ho) 
C)   Both reactions have the same heat of reaction (∆Ho)  B

Question 12

Given the following rate law, what is the order of the reaction with respect to sodium cyanide?

Accepted Answer

second

Question 13

Identify the nucleophilic centers in the following molecule.

Accepted Answer

The answer of Identify the nucleophilic centers in the following...

Question 14

For the following reaction step, indicate which pattern of arrow pushing it represents.

Accepted Answer

A)   proton transfer
B)   loss of leaving group
C)   nucleophilic attack
D)   rearrangement

Question 15

Identify the arrow in the following equation.

Accepted Answer

A)   
B)   
C)   
D)

Question 16

Using Table 6.1, estimate the enthalpy change of the following reaction under standard conditions.

Accepted Answer

The answer of Using Table 6.1, estimate the enthalpy change...

Question 17

The following reaction has three mechanistic steps. Draw all curved arrows necessary to complete the mechanism.

Accepted Answer

The answer of The following reaction has three mechanistic steps....

Question 18

Predict the sign of ∆S for the following reaction.

Accepted Answer

The answer of Predict the sign of ∆S for the...

Question 19

Identify the electrophilic site in the following molecule.

Accepted Answer

SHAPE \* M...

Question 20

What is a transition state?

Accepted Answer

A)   An isolable intermediate in a reaction.
B)   The starting materials of the reaction.
C)   A local maximum on the energy diagram.
D)   A low-energy point between the starting materials and the product.

Exam 6: Chemical Reactivity and Mechanisms

Using Table 6.1, estimate the enthalpy change of the following reaction under standard conditions.

Correct AnswerverifiedShow Answer

Which of the following energy diagrams shows a concerted endothermic reaction?

Correct AnswerverifiedShow Answer

Draw curved arrows for the following mechanistic step.

Correct Answerverified_TB4454_00 6.10 Desc...View AnswerShow Answer

Does a reaction with a ∆H of 20 kJ/mol and a ∆S of 10 J/mol·K at 298 K favor reactants or products?

Correct AnswerverifiedShow Answer

What is the energy of activation for the following reaction?

Correct Answerverified10 kJ/mol

Why is the entropy change negative for ring closures?

Correct AnswerverifiedShow Answer

Predict the sign of ∆G for an exothermic reaction with a decrease in entropy.

Correct AnswerverifiedShow Answer

Does a reaction with a Keq = 10 favor reactants or products?

Correct AnswerverifiedShow Answer

In a homolytic bond cleavage, ____ are formed.

Correct AnswerverifiedShow Answer

Which of the following indicates a reaction with a negative ∆G?

Correct AnswerverifiedShow Answer

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) ?

Correct AnswerverifiedB

Given the following rate law, what is the order of the reaction with respect to sodium cyanide?

Correct Answerverifiedsecond

Identify the nucleophilic centers in the following molecule.

Correct AnswerverifiedShow Answer

For the following reaction step, indicate which pattern of arrow pushing it represents.

Correct AnswerverifiedShow Answer

Identify the arrow in the following equation.

Correct AnswerverifiedShow Answer

Using Table 6.1, estimate the enthalpy change of the following reaction under standard conditions.

Correct AnswerverifiedShow Answer

The following reaction has three mechanistic steps. Draw all curved arrows necessary to complete the mechanism.

Correct AnswerverifiedShow Answer

Predict the sign of ∆S for the following reaction.

Correct AnswerverifiedShow Answer

Identify the electrophilic site in the following molecule.

Correct AnswerverifiedSHAPE \* M...View AnswerShow Answer

What is a transition state?

Correct AnswerverifiedShow Answer

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_TB4454_00 6.10 Desc...
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10 kJ/mol

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Does a reaction with a K_eq = 10 favor reactants or products?

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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 (∆H^o) ?

Correct Answer
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B

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second

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SHAPE \* M...
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