Between Mg and Zn which one is the anode and which one is the cathode?

And between Mg and Fe which one is the anode and which one is the cathode?
Please help!!

To determine which metal is the anode and which one is the cathode, you need to consult the standard electrode potentials of the metals. These values indicate the tendency of a metal to undergo oxidation or reduction reactions.

For the first comparison between Mg and Zn, we compare their standard electrode potentials. The standard electrode potential of Mg (Mg2+(aq) + 2e- → Mg(s)) is approximately -2.37 V, while the standard electrode potential of Zn (Zn2+(aq) + 2e- → Zn(s)) is approximately -0.76 V.

Since the standard electrode potential of Mg is more negative than that of Zn, Mg tends to lose electrons (undergo oxidation) more easily than Zn. Therefore, Mg will be the anode, and Zn will be the cathode.

For the second comparison between Mg and Fe, the standard electrode potential of Fe (Fe2+(aq) + 2e- → Fe(s)) is approximately -0.44 V. As Fe has a more negative standard electrode potential compared to Mg, Fe will be the anode, and Mg will be the cathode.

In summary:
- Mg is the anode and Zn is the cathode
- Fe is the anode and Mg is the cathode

Remember, when comparing standard electrode potentials, the metal with the more negative potential is the anode, and the metal with the less negative (or more positive) potential is the cathode.