Question

5. Clean an iron nail with a piece sandpaper of steel wool so the surface of the nail is shiny.
6. Place the nail in a test tube and add the 0.50 M Copper (II) sulphate solution so that one
half of the nail is covered.
7. After approximately 15 minutes, remove the nail and note any changes in both the nail
and the solution.
My answer is In Reaction 2 the changes of the iron nail and the solution indicate that when the solution came in contact with the iron nail, the iron nail began to rust.