Chapter 4-Chemical Dominoes
Section 6: Electrochemical Cells and Half-Reactions
Pre-Test
1) Which of the following statements is true regarding solutions that conduct electricity?
a. Solutions that conduct electricity contain neutral particles that do move around.
b. Solutions that conduct electricity contain neutral particles that do not move around.
c. Solutions that conduct electricity contain charged particles that do move around.
d. Solutions that conduct electricity contain charged particles that do not move around.
2) When a metal loses electrons to form positive metal ions, this process is called oxidation.
In an electrochemical cell, where does oxidation take place?
a. In the cathode
b. In the anode
c. In both the anode and cathode
d. In the salt bridge
3) When a metal loses electrons to form positive metal ions, this process is called oxidation.
Which of the following balanced half-reactions represent the oxidation process?
a. Zn  Zn2+ + 2eb. Al3+ + 3e-  Al
c. 2 Ag+ + 2e-  2 Ag
d. Na+1 + 1e-  Na
Use the activity series of metals below to answer question 4 and question 5.
Activity Series of Metals
Element
lithium (most active)
rubidium
potassium
barium
calcium
sodium
magnesium
aluminum
manganese
zinc
chromium
iron
cobalt
nickel
tin
lead
*hydrogen
copper
mercury
silver
platinum
gold (least active)
Symbol
Li
Rb
K
Ba
Ca
Na
Mg
Al
Mn
Zn
Cr
Fe
Co
Ni
Sn
Pb
H
Cu
Hg
Ag
Pt
Au
4) When a metal loses electrons to form positive metal ions, this process is called oxidation.
Which of the following metals would oxidize most easily?
a. calcium
b. chromium
c. cobalt
d. copper
5) Which of the following metals would be best to use as the cathode in an electrochemical
cell?
a. aluminum
b. iron
c. magnesium
d. nickel