Fe(s) + NiCl2(aq) ==> FeCl2(aq) + Ni(s)
2Na(s) + 2H2O(l) ==> 2NaOH(aq) + H2(g)
You need the activity series to do these. Here is a site that I like.
http://www.files.chem.vt.edu/RVGS/ACT/notes/activity_series.html
This site tells you that any metal will displace the ion of a metal BELOW it in the series. Fe is above Ni; therefore, Fe displaces Ni^2+ in NiCl2. Na is above H; therefore, Na displaces H^+ in H2O.
If you had Ni + FeCl2 ==> you would write No reaction BECAUSE Ni is BELOW Fe so Ni will not displace Fe^2+
What are the equations for these two equations? Not net ionic equations.
a) Nickel (II) chloride and iron
b) Sodium and water
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