Exam 3: Acids and Bases

A) (CH₃) ₂NH
B) (CH₃) ₃N
C) (CH₃) ₂NLi
D) More than one of these choices.
E) None of these choices.

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A) The reaction is an endothermic reaction and $\Delta$ S is approximately zero.
B) The reaction is an endothermic reaction and $\Delta$ S is negative.
C) The reaction is an exothermic reaction and $\Delta$ S is negative.
D) The reaction is an exothermic reaction and $\Delta$ S is approximately zero.
E) None of these choices.

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A) The reaction is an endothermic reaction and $\Delta$ S is approximately zero.
B) The reaction is an endothermic reaction and $\Delta$ S is negative.
C) The reaction is an exothermic reaction and $\Delta$ S is negative.
D) The reaction is an exothermic reaction and $\Delta$ S is approximately zero.
E) None of these choices.

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A)
B)
C) CH₃O^-
D) two of these choices
E) there is no electrophile in this reaction

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A) " $\Delta$ G is negative and $\Delta$ S is approximately zero"
B) " $\Delta$ G is negative and $\Delta$ S is negative"
C) " $\Delta$ G is positive and $\Delta$ S is positive"
D) " $\Delta$ G is negative and $\Delta$ S is positive"
E) "None of these choices."

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A) CH₃CH₂OH
B) CH₃CO₂H
C) HC $\equiv$ CH
D) CH₂=CH₂
E) CH₃CH₃

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A) The stronger the acid,the larger is its pK_a.
B) The conjugate base of a strong acid is a strong base.
C) Acid-base reactions always favor the formation of the stronger acid and the stronger base.
D) Strong acids can have negative pK_a values.
E) Hydrogen need not be present in the molecular formula of a Bronsted-Lowry acid.

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D

A) The reaction is an exothermic reaction and $\Delta$ H is approximately zero.
B) The reaction is an endothermic reaction and $\Delta$ H is negative.
C) The reaction is an exothermic reaction and $\Delta$ H is negative.
D) The reaction is an exothermic reaction and $\Delta$ H is positive.
E) None of these choices.

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A) I > II > III > IV > V
B) II > V > III > I > IV
C) II > III > V > I > IV
D) III > I > V > II > IV
E) V > II > III > I > IV

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A) NaNH₂ + CH₃CH₂CH₂CH₂CH₂CH₃
B) CH₃CH₂CO₂Na + HI
C) CH₃Li in hexane + ethyne
D) NaH + methanol
E) Two of these choices will not occur.

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A) RSH compounds are stronger acids than ROH compounds.
B) PH₃ is a weaker base than NH₃.
C) NH₂^- is a stronger base than OH^-.
D) OH^- is a stronger base than OR^-.
E) H^- is a stronger base than OR^-.

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A) H₃O⁺
B) H₂SO₄
C) HClO₄
D) HCl
E) HNO₃

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A) CH₃CH₂OH pK_a = 18
B) CH₃CO₂H pK_a = 4.75
C) ClCH₂CO₂H pK_a = 2.81
D) Cl₂CHCO₂H pK_a = 1.29
E) Cl₃CCO₂H pK_a = 0.66

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A

A) PH₂^- > SiH₃^- > HS^- > Cl^-
B) SiH₃^- > PH₂^- > HS^- > Cl^-
C) Cl^- > HS^- > PH₂^- > SiH₃^-
D) HS^- > Cl^- > SiH₃^- > PH₂^-
E) Cl^- > PH₂^- > SiH₃^- > HS^-

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A) III > II > IV > V > I
B) II > III > V > IV > I
C) II > V > III > IV > I
D) V > III > II > IV > I
E) I > IV > II > III > V

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A) NaOH + NaOCH₃ + H₂S
B) H₃O⁺ + Na₂S + NaOCH₃
C) H₂SO₄ + NaOCH₃
D) H₃O⁺ + NaOH + CH₃SH
E) No reaction occurs

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