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Home  arrow Chapter 20: Electrochemistry  arrow Quiz 1

Quiz 1



This activity contains 12 questions.

Question 1.
Based on the data in Appendix E, which of the following is the strongest oxidizing agent and which is weakest in acidic solution: Ce4+, Br2, H2O2, Cu+?

 
End of Question 1


Question 2.
Breathalyzers determine alcohol content via the redox reaction

Cr2O72- + C2H5OH --> Cr3+ + C2H4O2

Which substance is a reductant (reducing agent) and which is an oxidant (oxidizing agent)?

 
End of Question 2


Question 3.

Complete and balance the following equation:

Cr2O72-(aq) + NO2-(aq) --> NO3-(aq) + Cr3+(aq) (acidic solution)

How many water molecules are needed and on which side of the equation must they appear?

 
End of Question 3


Question 4.
Given the following information,

Fe3+(aq) + H2(g) --> 2H+ + Fe2+, E°cell = 0.77.

Determine E° for the reaction

e- + Fe3+(aq) --> Fe2+(aq).

 
End of Question 4


Question 5.
Predict the products in the electrolysis of aqueous potassium bromide.

 
End of Question 5


Question 6.
The standard reduction potentials in V for Pb2+ and Ag+ are -0.13 and +0.80, respectively. Calculate E° in volts for a cell in which the overall reaction is

Pb + 2Ag+ --> Pb2+ + 2Ag

 
End of Question 6


Question 7.

The two electrodes Cr(s)/Cr3+(aq) and Sn(s)/Sn2+(aq) are combined to afford a spontaneous electrochemical reaction. The standard reduction potentials in V for Cr3+(aq) and Sn2+(aq) are -0.74 and -0.14, respectively. E° in V is
 
End of Question 7


Question 8.
Using standard reduction potentials, predict which of the following metal(s) would react with a solution of copper(II) ions. iron, zinc, aluminum, cadmium, silver

 
End of Question 8


Question 9.
What is G° at 298 K for the reaction Hg(l) + 2Fe3+(aq) --> Hg2+(aq) + 2Fe2+(aq)?

 
End of Question 9


Question 10.
What mass in grams of copper will be deposited from a solution of Cu2+ by a current of 2.50 A in 2.00 hr?

 
End of Question 10


Question 11.
Which of the following statements is/are correct?

(i) oxidation occurs at the anode

(ii) reduction occurs at the cathode

(iii) a reducing agent is oxidized during a redox reaction

 
End of Question 11


Question 12.
Which of these metals will not dissolve in hydrochloric acid under standard conditions?

 
End of Question 12





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