Pieces of zinc react with copper sulfate solution. Zinc sulfate solution is colourless.
Zn(s) + CuSO.(aq) → ZnSO.(aq) + Cu(s)
In another experiment, 0.043 mol of copper sulfate, CuSO4, is used.
Calculate, to one decimal place, the minimum mass of zinc that must be added to react with all the copper
sulfate.
(relative atomic mass: Zn = 65)
(2)

Yes i think so not 100 percent sure though

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

Maybe you should get some from your teacher and learn more so you can get your grades up and maybe study a bit more