Shiny Pennies

Shiny Pennis

PREP TIME: 2 MINUTES
EXPERIMENT DURATION: OVERNIGHT

Supplies Needed:

3 cups

1 lemon

Dark soda

Water

3 pennies made before 1983


Science Question:
Can you make a penny look new again?
Pennies made before 1983 are made of mostly copper, which turns dull with age. Using the juice of a lemon, or a dark soda, you can make a penny look new again.

The Experiment:
Line up the cups. Pour the juice of the lemon into one of your cups, pour soda in another and the fill the last with tap water. Drop a penny into each of cup and let it sit overnight.
In the morning, pull your pennies out of the liquid.

The Outcome:
The pennies that were in the soda and the lemon juice will be shiny, but the penny that was in water will still be dull.

Why It Worked:
SlThe liquids work as a cleaner, and easily take the gunk and grime off an old penny.

Variation:
• What happens if you try to clean a nickel, dime or quarter?

Did You Know?
Pennies used to be made entirely of copper, but they stopped using it when the amount of copper in a penny started to be worth more than the penny itself!

The 101 coolest Simple Science Experiments by Rachel Miller, Holly Homer & Jamie Harrington

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