Question

How do you balance `Zn + CuSO_4 -> ZnSO_4 + Cu`?

Answer 1

It is already balanced.

Explanation:

What I always do first when balancing chemical equations is calculating the number of atoms for each element :

Zinc (Zn), we have `1` on the LHS, and `1` on the RHS.
Copper (Cu), we have `1` on the LHS, and `1` on the RHS.
Sulphur (S), we have `1` on the LHS, and `1` on the RHS.
Oxygen (O), we have `4` on the LHS, and `4` on the RHS.