1. Write the net ionic equation for the precipitation reaction that occurs when aqueous solutions of potassium sulfide and chromium(II) nitrate are combined. Be sure to specify states such as (aq) or (s).

2. Does a reaction occur when aqueous solutions of calcium chloride and ammonium sulfate are combined? yes

Be sure to specify states such as (aq) or (s).

Write the net ionic equation. _______________________

3. When solid Ni metal is put into an aqueous solution of Cu (NO₃)₂ , solid Cu metal and a solution of Ni (NO₃)₂ result. Write the net ionic equation for the reaction.