andrew o'leary science fair backboard
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“The Corrosive Effects of Soda”
Andrew O’LearyNovember 28, 2011
Period 4
HypothesesThe darker colored soda has more corrosive
effects than lighter colored soda. The pennies left in the darker colored soda will look less tarnished than the pennies in lighter soda.
Abstract The purpose of this project was to determine the effects of soda on
corrosion of the tooth enamel. The project was to determine which sodas caused more corrosion; lighter colored or darker colored.
The hypotheses of the project were that the darker colored soda has more corrosive effects than lighter colored soda. The pennies left in the darker colored soda will look less tarnished than the pennies in lighter soda.
The first part of the procedures in this project was to locate six pennies with the same amount of tarnish on them. Each penny was placed in a cup with one cup of each soda used. One cup contained distilled water and the others contained Coke, Dr. Pepper, Sprite, Mountain Dew, and Pepsi. The pennies were placed in each cup and left for seven days. Each day in the afternoon, the pennies were checked for corrosiveness or amount of tarnish worn off the penny. Each penny was dried off and laid on a white note card and given a numerical measure of 0-10. All of the pennies started out with the rating of 10, meaning the most amount of tarnish and a 0 rating was no tarnish left. The pennies were photographed on the first and last day.
Variables, Constants,& ControlsManipulated Variable: The type of soda in the cup. Responding Variable: The amount of corrosion on the
penny. Constants: The amount of soda in the cup. The amount of tarnish on the penny. The size of the cup. The amount of time the penny spends in the soda. Control: One cup filled with distilled water.
Materials1 small bottle of Coca Cola1 small bottle of Pepsi1 small bottle of Dr. Pepper1 small bottle of Sprite1 small bottle of Mountain Dew1 small bottle of distilled waterSix plastic cupsSix tarnished penniesJournal or LogbookMeasuring cupPermanent marker for labeling
Procedures1. Fill a plastic cup with 1 cup (measured) of the
Coca Cola soft drink. Make sure each cup is labeled with the liquid that is contained within it.
2. Repeat step one with the remainder of the cups, filling each one with a different soft drink and finally, the water.
3. Drop each of the tarnished pennies in a separate cup. The penny that is soaking in the cup of distilled water will be your control.
Graph
Corrosion Chart Date Dr.
Pepper Mountain Dew
Coke Distilled Water
Pepsi Sprite
10/24/2011
10 10 10 10 10 10
10/25/2011
5 9 4 10 7 8
10/26/2011
2 8 2 10 6 6
10/27/2011
1 8 1 10 5 4
10/28/2011
0 8 1 10 4 3
10/29/2011
0 7 0 10 4 3
10/30/2011
0 7 0 10 4 3
10/31/2011
0 7 0 10 4 3
Key = 10 tarnish 1 No tarnish
ConclusionThe conclusion of the project is that the
darker colored sodas did cause more corrosion overall than the lighter colored sodas. Although Pepsi did not have as much corrosion as Dr. Pepper and Coke and Sprite had more corrosion than Pepsi, it cannot be determined that darker colored sodas cause more corrosion.