CHEM134 C003 Lesson 7-Assessment Questions and Answers Graded A+|Accurate|Verified 2026

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CHEM134 C003 Lesson 7-Assessment Questions and Answers
Graded A+

Question 1
Which of the following is true for the cell shown here?

Zn(s)│Zn2+(aq) ║ Cr3+(aq) │Cr(s)

The electrons flow from the zinc to the chromium.

The chromium is oxidized.
The zinc is reduced.

The electrons flow from the chromium to the zinc.
The electrons flow from the cathode to the anode.


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Question 2 points

How many moles of electrons are produced from a current of 17.6 A in 3.00 hours?

5.47 x 10–4 mol



3.35 mol

1.97 mol

52.8 mol


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Question 3 points

The measured voltage of a cell in which the following reaction occurs is 0.96 V

H2(g, 1.0 atm) + 2Ag+(aq, 1.0 M) → 2H+(aq, pH = ?) + 2Ag(s)

Calculate the pH of the H+(aq) solution.

, 2.7

7.1

1.4

14.9

5.4


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Question 4 points

The following reaction occurs in basic solution:

F2 + H2O → O2 + F–

hen the equation is balanced, the sum of the coefficients is:




points



Pt(s) | H2(g) | H+(aq) || Ag+(aq) | Ag(s)

what is the balanced overall (net) cell reaction?

2H+(aq) + 2Ag(s) → H2(g) + 2Ag+(aq)

H2(g) + Ag+(aq) → H+(aq) + Ag(s)

H2(g) + 2Ag(s) → H+(aq) + 2Ag+(aq)

2H+(aq) + 2Ag+(aq) → H2(g) + 2Ag(s)

H2(g) + 2Ag+(aq) → 2H+(aq) + 2Ag(s)




Question 6 points

Given the following reaction in acidic media:

Fe2+ + Cr2O72– → Fe3+ + Cr3+