I did an experiment where You will place five metals in different metal ion solutions to see which combinations of metals and ions result in single displacement reactions. The metal are Mg(s) (MgSO4 )

I did an experiment where You will place five metals in different metal ion solutions to see which combinations of metals and ions result in single displacement reactions. The metal are Mg(s) (MgSO4 ), Zn(s) (ZnSO4 ) , Cu(s) (CuSO4 ) , Sn(s) (SnCl2 ) and Fe(s) (FeSO4 ) and the ions are Mg2+(aq) , CU2+(aq) , Zn2+(aq) , Sn2+(aq) and Fe2+(aq). Only 8 reactions occurred  during the experiment and they were between  Mg(s) and  Zn2+(aq) , Mg(s) and CU2+(aq) , Zn(s) and  CU2+(aq) , Sn(s) and CU2+(aq) ,  Fe(s) and  CU2+(aq) ,  Mg(s) and Sn2+(aq) , Zn(s) and Sn2+(aq) , Mg(s) and Fe2+(aq) .

I need help with this question, include a "sources of error section"- what metals/ions should have reacted?  Use textbook or online sources to find out what should have happened (theoretical results)- compare the theoretical results to your observations and come up with two sources of error.

Observation

Mg (MgSO4 ) and  Zn2+                                                             Mg (MgSO4 ) and CU2+                                      

Bubbles, Turned back and start to break sown                  Big bubbles, fizzing, foam and turned darker

Zn (ZnSO4 ) and  CU2+                                                                                                 Sn (SnCl2 ) and CU2+

Zn turned black, turned Cu2+ green, bubbles and start to break down                          Turned cloudy and turned black only at the top

Fe(FeSO4 ) and  CU2+                      Mg (MgSO4 ) and Sn2+                       Zn (ZnSO4) and Sn2+                Mg (MgSO4 ) and Fe2+ 

get softer and bubbles                       bubbles and frizzing                                bubbles and frizzing                   bubbles and frizzing

Mg(MgSO4 ) and Mg2+                      Zn(ZnSO4 ) and Mg2+                  Zn(ZnSO4 ) and Fe2+           Cu(CuSO4 ) and Mg2+

  No reaction                                               No reaction  

 Cu (CuSO4 ) and CU2+                       Cu (CuSO4 ) and Zn+2 Cu                    (CuSO4 ) and Fe+2               Cu(CuSO4 ) and Sn2+

No reaction                                                 No reaction                                                  No reaction                               No reaction 

 Sn (SnCl2 ) and Zn2+                Sn (SnCl2 ) and Sn2+                         Sn(SnCl2 ) and Fe2+                      Sn(SnSO4 ) and Mg2+

   No reaction                                         No reaction                                         No reaction                                         No reaction 

Zn(ZnSO4 ) and Zn2+                  Fe (FeSO4 ) and Mg 2+             Fe (FeSO4 ) and Fe2+             Fe (FeSO4 ) and Zn2+        

No reaction                                       No reaction                                      No reaction                              No reaction 

Fe (FeSO4 ) and Sn2+

No reaction