Answer:
You have to use a sufficient amount of heat, to make a zinc plated copper penny into a gold color
There are also 7 detailed steps you can use if you are tryin got make gold pennies
1.Pour 20 mL of NaOH solution to the dish.
2.Add the zinc dust in the dish with the NaOH, and gently swirl the mixture together.
3.Set the hot plate to medium heat and place the evaporating dish on top.
4.Heat for 5 minutes. Do not boil. When the dish is hot, place a penny in it. Heat for two minutes or until the penny is coated and becomes silver in appearance.
5.Remove the penny from the dish with tongs and drop it into water. When cool, wipe the penny clean with a cloth to remove any excess zinc.
6.Using tongs, hold the penny in the flame of a Bunsen burner and gently heat. The penny should turn “gold” (brass). (Do not overheat the penny.)
7.Dip the penny in the beaker of water until it is cool to the touch.
