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10 very dirty pennies (the dirtier the better! A questionable aspect of this experiment is arisen with the change of the color of ammonia during the experiment. Science Activity: Turn Old Pennies Bright and Shiny! | Exploratorium Shine Bright Like aPenny! - Scientific American Pour cup of baking soda into one of your plastic cups. Wipe the excess ketchup off the pennies, then rinse them off. It is a great sensory STEM activity for preschoolers and older children. Penny lab experiment conclusion.By comparison, the old pre-1982 copper pennies were 95% copper and 5% zinc with a density of 8. Just don't drink the coke afterward. Conclusion: The hypothesis was proven true, and the pennies, were best cleaned by the strongest acid, which in this experiment was lemon juice. Salt is another compound called sodium chloride, so it contains a chemical called chlorine (like what we use in swimming pools to keep them clean). The soda cleans the pennies because it contains phosphoric acid. Coke contains phosphoric acid that cleans the oxides. I'm giving you a shout out on the post. Leave them there for 10 minutes while you and your kids talk about the results of the first experiment. There is a second stage to this experiment that you can also try out, and the only extra materials you will need is two more old pennies and some more paper towels. What is the optimal time to leave the pennies in the cleaning solution? Cleaning Pennies Science Project.docx - Course Hero While copper is a beautiful metal, it is also reactive. Pennies are obviously made of copper, and they start out bright and shiny when they are new. I'm so glad you liked it! Try more solutions. The vinegar removed some of the copper from the pennies, if there is enough copper in the vinegar, the copper will become attracted by to the metal in the nuts and bolts and they will take on a new copper color - cool. Leave the coins to air dry for at least 30 minutes. Follow us on Facebook, Twitter or Instagramto see new experiments! First, put the coins back into the same mixture as the one you used in the first experiment. Were you surprised by the results? You may print and distribute up to 200 copies of this document annually, at no charge, for personal and classroom educational use. You can actually do lots of simple science experiments at home with just a few basic supplies. Which penny is the cleanest, compared to the control? All you need are pennies, water, dish soap, salt, and vinegar. My kids had fun doing this, raiding their piggy banks to find some dirty pennies. Here is a step by step walkthrough of the experiment so you dont get forget what to do or lose track of where you are: Once this is all done, you may be tempted to clean everything but not yet! Once 5 minutes has passed, rinse each cup with water until the inside of the cup and the pennies are clean (be careful not to lose your penny!). i need to know!!! Before you start, its important to take note that for this cleaning coins experiment to work, you need coins made of copper; otherwise, this will not work.