Electroplating Processes and Concepts

The video tutorial explains the process of electroplating, where an electric current is used to plate one metal onto another. It highlights practical applications, such as in pennies and jewelry. The experiment involves electroplating a penny with zinc using a zinc chloride solution. The setup includes attaching alligator clips to a battery and immersing a penny and copper strip in the solution. The video details the flow of electrons and the attraction of zinc ions to the penny, forming a zinc shell. Observations include color changes in the copper strip, indicating the transformation of solid copper to liquid copper in the solution.

What is the primary purpose of electroplating in the context of currency and jewelry?

• To increase the weight of the items

• To enhance the appearance and reduce costs

• To make the items more durable

• To change the chemical composition of the items

Which metal is used as a shell in the electroplating of pennies?

• Copper

• Silver

• Gold

• Zinc

In the experiment, what is attached to the positive end of the battery?

• A penny

• A zinc strip

• A copper strip

• An iron nail

What role do electrons play in the electroplating process?

• They change the color of the solution

• They repel the metal ions

• They attract positive ions to the surface

• They dissolve the metal

Why are zinc ions attracted to the penny during electroplating?

• Because zinc ions are negatively charged

• Because zinc ions are neutral

• Because the penny is negatively charged

• Because the penny is positively charged

What forms on the penny as a result of the electroplating process?

• A copper shell

• A zinc shell

• A gold shell

• A silver shell

What change is observed in the copper strip during the experiment?

• It remains unchanged

• It changes color

• It becomes thicker

• It dissolves completely

Why does the part of the copper strip in the solution appear different?

• It is unaffected by the solution

• It turns into liquid copper

• It is oxidized

• It is coated with zinc

What happens to the solid copper during the electroplating process?

• It forms a new compound

• It remains solid

• It turns into liquid copper

• It becomes a gas

What is the reason for the color difference in the copper strip?

• The copper strip is heated

• The copper strip is painted

• The copper strip is coated with zinc

• The copper turns into liquid and enters the solution