partial equations??

Question

not sure how to do these..Im supposed to write the partial equations for the following and then write the products I believe will form. Any help??

1) Fe(s) + Cu(2+) (aq)----->
2) Mg(s) + 2 H(+) (aq)------>
3) Cu(s) + 2 Ag(+) (aq)------->
4) Zn(s) + Cu(2+) (aq)------>
5) Cu(s) + Zn(2+) (aq) ------>

Answer 1

These are all reduction-oxidation reactions. You can separate each of these reactions in to a reduction half reaction and an oxidation half reaction. In the first, electron(s) will be on the left side, and in the oxidation, electrons will be on the right side.

1). Cu2+ + 2e- --> Cu(s) and Fe(s) --> Fe3+ + 3e-
( whether for this assignment or not, you will eventually have to balance the number of electrons between the two reactions)
3 Cu2+ + 6 e- --> 3 Cu(s)
2 Fe3+ + 6 e- --> 2 Fe(s)

The others are done the same way...You'll need to know the stable forms of the different ions formed in these reactions.. Send me a message if this doesn't help.