The balanced chemical equation for the reaction between zinc and copper II nitrate is:

Zn(s) + Cu(NO3)2(aq) → Zn(NO3)2(aq) + Cu(s)

In this reaction, zinc metal (Zn) reacts with copper II nitrate (Cu(NO3)2) to form zinc nitrate (Zn(NO3)2) and copper metal (Cu). The reaction involves a single displacement reaction, where zinc displaces copper from the copper II nitrate compound.