Electrochemical Cells Question Preview (ID: 14584)
Review Of Voltaic/ Electrolytic Cells.
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The type of reaction in a voltaic cell is best described as
a) spontaneous oxidation reaction only
b) nonspontaneous oxidation reaction only
c) spontaneous oxidation-reduction reaction
d) nonspontaneous oxidation-reduction reaction
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 prevent the migration of ions
c) to permit the mixing of solutions
d) to permit the flow of electrons
Consider the equation, 2 H2O + electricity --> 2 H2 + O2
a) a voltaic cell, because it releases energy
b) an electrolytic cell, because it releases energy
c) a voltaic cell, because it absorbs energy
d) an electrolytic cell, because it absorbs energy
In an electrolytic cell, to which electrode will a positive ion migrate and undergo reduction?
a) The anode, which is negatively charged
b) The anode, which is positively charged
c) The cathode, which is negatively charged
d) The cathode, which is positively charged
Which reaction occurs at the anode in a voltaic and electrolytic cell?
a) reduction only
b) oxidation only
c) both reduction and oxidation
d) neither reduction nor oxidation
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) Cu half-cell to the Zn half-cell through the salt bridge
c) Zn half-cell to the Cu half-cell through the wire
d) Zn half-cell to the Cu half-cell through the salt bridge
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+ + e- --> Li(l)
d) Li+ --> Li(l) + e-
When electroplating with silver, the mass of the negative electrode
a) decreases
b) increases
c) remains the same
d)
Which of the following occurs in an electrolytic cell?
a) A chemical reaction produces an electric current.
b) An electric current produces a chemical reaction.
c) An oxidation reaction takes place at the cathode.
d) A reduction reaction takes place at the anode.
In an electrolytic cell, which ion would migrate through the solution to the positive electrode?
a) a hydrogen ion
b) a chloride ion
c) an ammonium ion
d) a hydronium ion
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