Which liquid cleans pennies the best?
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Transcript of Which liquid cleans pennies the best?
Which liquid cleans pennies the best?
5th Grade Science Fair Project
Problem
• Which of the five liquids used will make these pennies the cleanest and shiniest?
Purpose
• To determine which liquid will make the pennies the cleanest.
Hypothesis
• The penny cleaned with cola will be the cleanest.
Research
• Before 1982, pennies were made of pure copper.• After 1982, pennies are made of zinc core with a thin
copper plating.• Pure copper pennies look dirty because the copper
mixes with the oxygen in the air and makes copper oxide.
• All 5 pennies I am using are from before 1982.
Materials• ½ cup measuring cup
• 5 clear plastic cups & 5 pennies
• ½ cup of each liquid: coffee, cola, grapefruit juice, banana pepper juice & pickle juice
• bowl of clean tap water
• Pen, marker, paper & camera
Procedure/Experiment• Pour ½ cup of each liquid into clear cups
• Take picture of pennies before dropping into liquids
• Drop one penny into each cup of liquid
• Wait 15 minutes
• Take each penny out and rinse in bowl of clean tap water
• Take picture of clean pennies after rinsing
• Take notes of which is the cleanest, next to cleanest and etc…
Procedure/Experiment
Results
Results Best to worst:
☼ banana pepper juice☼ kosher dill pickle juice
☼ grapefruit juice☼ cola
☼ coffee
Conclusion
• My hypothesis that the cola would clean the penny the best was incorrect. In fact, the cola was in 4th place as a cleaner. My project clearly shows the banana pepper juice was the best cleaner. The pickle juice in 2nd place did a better job than the 3rd place grapefruit juice. And last, I saw no change on the penny that was in the 5th place coffee.