Chemistry question, Please help!

Question

a piece of iron is placed in a solution of Cu(NO3)2 and copper plates out on the iron, similarly when the iron is places in a solution of AgNO3, silver plates out on the iron. When a piece of copper is placed in AgNO3, silver plated out on the copper. the iron and the copper both ionize as 2+ ions, and the silver ionizes as a 1+ ion. Write a balances equation for the chemical reaction and list the metals in order of descending activity

Answer 1

Iron placed in Cu(NO₃)₂:

Fe(s) + Cu(NO₃)₂(aq) ==> Cu(s) + Fe(NO₃)₂(aq) ... Fe is oxidized and Cu is reduced

Iron placed in AgNO₃:

Fe(s) + 2AgNO₃(aq) ==> 2Ag(s) + Fe(NO₃)₂(aq) ... Fe is oxidized and Ag is reduced

Copper placed in AgNO3:

Cu(s) + 2AgNO₃(aq) ==> 2Ag(s) + Cu(NO₃)₂(aq) ... Cu is oxidized and Ag is reduced

From the above reactions, it can be seen that Fe can displaced Cu and Ag (reactions 1 and 2), and we also see that Cu can displace Ag (reaction 3). Thus, Fe has the greatest activity, followed by Cu and then Ag has the lowest activity.