The electrode reactions are
Zn ==> Zn^2+ + 2e
Fe^2+ + 2e ==> Fe
The anode is where oxidation occurs; therefore, Zn is the anode and it is the negative electrode. Electrons flow from Zn to Fe. Zn is more "active" than Fe.
A student constructs a galvanic cell that has a strip of iron metal immersed in a solution of
0.1M Fe(NO3)2 as one half-cell and a strip of zinc metal immersed in a solution of 0.1M Zn(NO3)2
as the other half-cell. The measured cell potential is less than zero when the positive terminal of
the voltmeter is attached to the zinc strip and the negative terminal is attached to the iron strip.
Which half-cell is the anode (Fe or Zn)?
Which half-cell is the cathode?
Do the electrons flow from Zn to Fe or vice versa?
Which metal is more “active” Zn or Fe?
1 answer
1 answer