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Provide the equation that relates the equilibrium constant, Keq, to the acid dissociation constant, Ka, for the following equilibrium. Provide the equation that relates the equilibrium constant, K<sub>eq</sub>, to the acid dissociation constant, K<sub>a</sub>, for the following equilibrium.

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Provide the equation for the acid dissociate constant, Ka,for the following equilibrium. Provide the equation for the acid dissociate constant, K<sub>a</sub>,for the following equilibrium.

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Which atom in the following structure is preferentially protonated by a strong acid? Which atom in the following structure is preferentially protonated by a strong acid? A) i B) ii C) iii D) iv


A) i
B) ii
C) iii
D) iv

E) B) and C)
F) B) and D)

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What is the value of the equilibrium constant for the following equilibrium? What is the value of the equilibrium constant for the following equilibrium?

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log10Keq = pKa(acid) - pK...

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Provide a brief explanation, based on features of the molecules, for the following trend in pKa values? Provide a brief explanation, based on features of the molecules, for the following trend in pK<sub>a</sub> values?

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This trend is best understood in terms o...

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Which of the following compounds has the highest pKa?


A) SiH4
B) H2S
C) PH3
D) HCl

E) All of the above
F) None of the above

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What is the value of the equilibrium constant, Keq, for the following reaction? What is the value of the equilibrium constant, K<sub>eq</sub>, for the following reaction? A) 10<sup>13</sup> B) 10<sup>-13</sup> C) 13 D) (<sup>1</sup>/<sub>13</sub>)


A) 1013
B) 10-13
C) 13
D) (1/13)

E) A) and D)
F) All of the above

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Which of the following is a definition of the rate-determining step of a reaction mechanism?


A) the first step
B) the last step
C) the step that crosses the highest energy barrier
D) the most exothermic step

E) A) and B)
F) A) and C)

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Which of the following is a Lewis acid but not a Brønsted-Lowry acid?


A) CH3COOH
B) AlCl3
C) H2O
D) CH3OH

E) C) and D)
F) B) and D)

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Which of the following is present in the highest concentration upon dissolution of H2SO4 in water?


A) H2SO4
B) H+
C) H3O+
D) HO-

E) B) and D)
F) B) and C)

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Which of the following terms describes the role of ethyne in the acid-base reaction shown? Which of the following terms describes the role of ethyne in the acid-base reaction shown? A) Brønsted-Lowry acid B) Brønsted-Lowry base C) Lewis acid D) Lewis base


A) Brønsted-Lowry acid
B) Brønsted-Lowry base
C) Lewis acid
D) Lewis base

E) B) and C)
F) A) and B)

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Which of the following has a pKa value of approximately 25?


A) CH3CH3
B) CH2=CH2
C) HCºCH
D) CH3CH2OH

E) A) and D)
F) C) and D)

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Which of the following compounds has the highest pKa?


A) NH3
B) H2O
C) HCl
D) CH4

E) A) and B)
F) None of the above

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Which of the following equations is correct?


A) DG °\degree = DH °\degree - TDS °\degree
B) DH °\degree = DG °\degree - TDS °\degree
C) DG °\degree = DH °\degree - DS °\degree
D) DG °\degree = DH °\degree - DS °\degree /T

E) A) and B)
F) B) and D)

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Which of the following anions is the strongest base?


A) CH3COO-
B) HO-
C) NH2-
D) Cl-

E) A) and B)
F) A) and C)

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Which of the following is the strongest acid?


A) HCl
B) HI
C) HF
D) HBr

E) A) and C)
F) B) and C)

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Which of the following is a feature of a Brønsted-Lowry acid?


A) proton donor
B) proton acceptor
C) electron pair donor
D) electron pair acceptor

E) A) and C)
F) C) and D)

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Provide a brief explanation, based on features of the molecules, for the following trend in pKa values? Provide a brief explanation, based on features of the molecules, for the following trend in pK<sub>a</sub> values?

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This trend is best understood in terms o...

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What is the approximate pKa value of HCl?


A) -7
B) 5
C) 16
D) 51

E) C) and D)
F) B) and C)

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Which of the following is the strongest acid?


A) CH3OH
B) CH3CHO
C) CH3COCH3
D) CH3COOH

E) None of the above
F) B) and C)

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