Question

Why was it important to polish the copper strips and wire, the coin, and the nail in the electroplating experiment?

You need to remove a layer of copper from the surface of each material.

You need to have a clean surface for contact between the solution and the material.

You need to heat up the surface of each material by friction to get the reaction going.

You need to apply a layer of iron to the surface of each material.

Answer 1

You need to have a clean surface for contact between the solution and the material.

Step-by-step explanation:

The presence of impurity on the surface of the material, and lack of surface uniformity (smoothness) can reduce the effective contact between material and solution and can interfere with the electroplating process's success.