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Electrochemical Cells
Test Description: Review of Voltaic/ Electrolytic cells
Instructions: Answer all questions to get your test result.
1) The type of reaction in a voltaic cell is best described as
A
spontaneous oxidation-reduction reaction
B
spontaneous oxidation reaction only
C
nonspontaneous oxidation-reduction reaction
D
nonspontaneous oxidation reaction only
2) An electrochemical cell is made up of two half-cells connected by a salt bridge and an external conductor. What is the function of the salt bridge?
A
to permit the migration of ions
B
to permit the mixing of solutions
C
to prevent the migration of ions
D
to permit the flow of electrons
3) Consider the equation, 2 H2O + electricity --> 2 H2 + O2
A
an electrolytic cell, because it absorbs energy
B
a voltaic cell, because it releases energy
C
a voltaic cell, because it absorbs energy
D
an electrolytic cell, because it releases energy
4) In an electrolytic cell, to which electrode will a positive ion migrate and undergo reduction?
A
The cathode, which is negatively charged
B
The anode, which is negatively charged
C
The cathode, which is positively charged
D
The anode, which is positively charged
5) Which reaction occurs at the anode in a voltaic and electrolytic cell?
A
both reduction and oxidation
B
reduction only
C
neither reduction nor oxidation
D
oxidation only
6) A voltaic cell is constructed using Cu and Zn electrodes. The electrons flow from the
A
Cu half-cell to the Zn half-cell through the wire
B
Zn half-cell to the Cu half-cell through the salt bridge
C
Zn half-cell to the Cu half-cell through the wire
D
Cu half-cell to the Zn half-cell through the salt bridge
7) The equation for the electrolysis of a fused salt is as follows: 2 LiCl(l) + electricity --> 2 Li(l) + Cl2(g). Which reaction occurs at the cathode?
A
2 Cl- --> Cl2(g) + 2 e-
B
2 Cl- + 2 e- --> Cl2(g)
C
Li+ --> Li(l) + e-
D
Li+ + e- --> Li(l)
8) When electroplating with silver, the mass of the negative electrode
A
decreases
B
remains the same
C
increases
9) Which of the following occurs in an electrolytic cell?
A
An oxidation reaction takes place at the cathode.
B
A chemical reaction produces an electric current.
C
A reduction reaction takes place at the anode.
D
An electric current produces a chemical reaction.
10) In an electrolytic cell, which ion would migrate through the solution to the positive electrode?
A
a chloride ion
B
a hydronium ion
C
an ammonium ion
D
a hydrogen ion
*select an answer for all questions
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