Which direction would these electrons flow?

Question

If the following pairs of metals and solutions of their ions were put together in a voltaic cell, which directions would the electrons flow in?

Al and Ni _______ ----> _______

Mn and Pb _______ --- > _______

Ag and Zn _______ --- > ________

Cu and Cr ________ --- > _______

Pb and Ag _________ --- > _______

Answer 1

Electrons would flow through the wire comprising the external circuit:

Al to Ni

Mn to Pb

Zn to Ag

Cr to Cu

Pb to Ag

The metal that gets oxidized in the solution sends the electrons that it loses through the external circuit. The key thing to remember is that whether the cell is electrolytic (using electricity) or voltaic (making electricity), oxidation occurs at the anode. Therefore the other side is the cathode. Therefore the anode is (-). Therefore the cathode is (+).

Answer 2

Lancenigo di Villorba (TV), Italy

Hi!
I suggest you read my preceeding answer in theme "Nichelous salts and metalic zinc".

Strictly speaking in school surroundings, you should follows this statement "in galvanic couples, electrons flow toward the electrode built in the most noble metal".
A contraction of electrochemical series show this order :
(MOST) Ag ; Cu ; Pb ; Ni ; Cr ; Zn ; Mn ; Al (LEAST)
WHAT ARE THE ANSWERS?
Al / Ni ; toward Ni.
Mn / Pb ; toward Pb.
Ag / Zn ; toward Ag.
Cu / Cr ; toward Cu.
Pb / Ag ; toward Ag.

I hope this helps you.

Answer 3

Al and Ni __Ni_____ ----> ____Al___

Mn and Pb ____Pb___ --- > ___Mn___

Ag and Zn __Zn_____ --- > _____Ag___

Cu and Cr ___Cr_____ --- > ___Cu____

Pb and Ag ____Ag_____ --- > ___Pb____

I hope this helps!!