Order Electrochemistry Discussion Questions

Order Electrochemistry Discussion Questions
Order 5980823
Order Electrochemistry Discussion Questions
1. Which of the following processes occurs in this reaction?
(A) O acts as an oxidizing agent.
(B) O° acts as an oxidizing agent.
(C) AI is reduced at the cathode.
©) Al is oxidized at the anode.
(E) Aluminum is converted from a negative to a neutral oxidation state.
2. A steady current of 15 amperes is passed through the cell for 20 minutes.
Which of the following correctly expresses how to calculate the number of
grams of aluminum produced by this cell (1 faraday = 96,500 coulombs)?
(27)(3)(60)
(15)(20)(96, 500)
(3)(96,500)
(15)(20)(60)(27)
(15)(20)(27)
© (3)(96,500)
py) LICOEH)
(3)(96,500)
(15)(20)(27)(3)
(96,500)(60)
(A)
(
(E)
92 » 500 AP Chemistry Questions to Know by Test Day
Xu) 2 Ag” (ag) > 2 Agy) “te Xt Eq = 2.27
2Ag* ag t 2 > 2 Agy E° = 0.80 V
3. According to the information above, what is the standard reduction
potential for the half-reaction X**(,4) 20D Xv?
(A) 0.67 V
(B) —0.67 V
(C) 1.47 V
(D) =1.47 V
(E) 3.07 V
4, An electric current of 1.00 ampere is passed through an aqueous solution
of FeCl,. Assuming 100 percent efficiency, how long will it take to
electroplate exactly 1.00 mole of iron metal?
(1 faraday = 96,500 coulombs = 6.02 x 10” electrons)
(A) 32,200 sec
(B) 96,500 sec
(C) 193,000 sec
(D) 289,500 sec
(E) 386,000 sec
Questions 375-381 refer to a galvanic cell made of two half-ceils. In one half-cell,
a Zn electrode is bathed in a 1.0 M ZnSO, solution. The other cell contains a 1 M
HCI solution and a hydrogen electrode.
Zn* 2.€ > ZnyE° = -0.76 V,
2 Ht 2e > HyyE° = 0.00 V
5. Which of the following is the correct electron configuration for Zn”?
(A). sas. ADt3S 3p Ak
ip ss? 2p° 3s? 3p3d”9.
(Gy dse2s- 2p? 35° 3p? 3d? 43?
(D) 1s? 2s? 2p® 3s? 3p® 3d8 4s?
(E) S29 2’s? 3p° Sd? 43
376. Which of the following correctly identifies and justifies which species,
Zn or Zn?*, has the highest ionization energy?
(A) Zn, electrons have a greater affinity for pure metals.
(B) Zn, it has a greater electron to proton ratio.
(C) Zn**, it has a larger radius.
(D) Zn7*, it has a greater effective nuclear charge.
(E) Zn**, it has a greater electron-to-proton ratio.
Electrochemistry <« 93
377. Processes that occur at the anode include which of the following?
378.
379.
380.
i
I.
II.
IV.
(A)
(B)
iny is oxidized to Zi jh
Zn (qq) is reduced to Zny.
Aix ) is oxidized to H* (aq).
2 H* (ay is reduced to Hy).
I only
II only
—Q III only
(D)
(E)
I and III only
II and IV only
The salt bridge is filled with a saturated solution of KNO.,. Processes that
occur at the salt bridge include which of the following? I. Il. IIL. IV.
(A) (B) (C) @) (E)
K* moves into the anode half-cell.
K* moves into the cathode half-cell.
NO; moves into the anode half-cell.
NO; moves into the cathode half-cell.
I only
III only
I and IV only
II and III only
I, I, Ill, and IV
Which of the following is true regarding the HCI half-cell? ®
(B) (C) (D)
(E)
The reduction of H* to H, is neither spontaneous nor nonspontaneous.
The reduction of H* and oxidation of H, are at equilibrium.
All electrochemical cells use a hydrogen half-cell.
It is used to measure the reduction potential of Zn** because the
reduction potential has a measured value of zero volts.
The E® value of 0 V for the hydrogen half-cell is arbitrary.
Which of the following is true regarding the standard free energy change
(AG°) of the cell? (A)
@)
(C) (D) (E)
It is negative because the standard reduction potential of Zn?* is
negative.
It is negative because the sum of the standard reduction potentials of
Zn** and H* is -0.76 V.
It is negative because the oxidation of Zn is spontaneous.
It is positive because the reduction of hydrogen ions is spontaneous.
It has a value of zero because the reaction is at equilibrium.
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