Presentation on theme: "Which liquid cleans pennies the best?"— Presentation transcript:
1 Which liquid cleans pennies the best? 5th Grade Science Fair Project
2 ProblemWhich of the five liquids used will make these pennies the cleanest and shiniest?
3 PurposeTo determine which liquid will make the pennies the cleanest.
4 HypothesisThe penny cleaned with cola will be the cleanest.
5 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.
6 Materials ½ cup measuring cup 5 clear plastic cups & 5 pennies ½ cup of each liquid: coffee, cola, grapefruit juice, banana pepper juice & pickle juicebowl of clean tap waterPen, marker, paper & camera
7 Procedure/Experiment Pour ½ cup of each liquid into clear cupsTake picture of pennies before dropping into liquidsDrop one penny into each cup of liquidWait 15 minutesTake each penny out and rinse in bowl of clean tap waterTake picture of clean pennies after rinsingTake notes of which is the cleanest, next to cleanest and etc…
10 kosher dill pickle juice ResultsBest to worst:banana pepper juicekosher dill pickle juicegrapefruit juicecolacoffee
11 ConclusionMy 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.