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Copy of My Science Fair Project

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Bree Green

on 22 September 2014

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Transcript of Copy of My Science Fair Project

Experimental Design


Fill your 3 cups with 1/2 cup of soda in each.

2. Drop 1 penny in each of the 3 cups.

3. Set the cups in a place where they wont get spilled, and aren't in direct sunlight.
I am going to test the soda's ability to clean a grimy penny.
We will do this by filling cups with different sodas and droping pennies in the soda for several hours at a time.
Then we will see how it worked/didn't work. Then we will observe the changes on the penny at different times.
4. check the coins after 24 hours
My purpose is to see if different sodas will affect the corrosion,& grime on a penny.
The sodas i chose were
Strawberry Lemonade, Grape soda,
& Pepsi.
Don't forget
to check
After 24 hours there were no results with any of the pennies.
After 48 hours the strawberry lemonade had the most results in cleaning all the grime off of the penny. As to the grape soda & the pepsi had barely removed any grime.
After 1 week the penny in the Strawberry Lemonade started to regrow grime. The Pepsi still had barely any affect on the penny, and the Grape Soda removed all of the grime and made the penny light pink in
I think
you leave pennies in different sodas for different amounts of time
it will cause the penny to change colors & eventually dissolve.
I also think the lighter soda will have more affect on the penny.

Source 1
Source 2
Source 3
During the experiment the amount of soda, the type of soda, & how many pennies there were did not change.

My independent variable was the type of soda.

My dependent variable was the cleanliness of the pennies.
1 - measuring cup.
3 - 12oz. foam or plastic cups.
3 - dirty or grimy pennies.
3 - sodas of your choice.
5. check the coins again after 48 hours
1 - sharpie to label cups
6. Continue to check the coins for 1 week.
Oxygen causes pennies to corrode forming copper oxide. All soda has some form of acid. The acid in the soda causes a chemical reaction on the penny. The acid in the soda then begins to eat and dissolve the grime off of the penny. The acid is carbonic acid. Also known as carbonation. The carbonation is what eats at the grime.
Soda pop contains phosphoric acid to improve taste. It also however increases the acidity levels in the soda. There is more phosphoric acid than carbonic acid though. So when it comes to removing grime the phosphoric acid is doing most of the work. Phosphoric acid is also known for slowing the growth rate of bateria and mold, that is why it works so well in removing grime off of pennies.
By: Breanna Green
7th grade
Mr. Roberts

Clean Pennies ?
Can pennies really be cleaned?
In this experiment I will test soda's ability to clean pennies.
In my hypothesis i was correct about the soda cleaning the penny and eventually dissolving it.
I was wrong however because the dark soda had more affect on the penny than the light soda.
The best result in the experiment was the grape soda completely restored the penny to a new, shiny, pinkish color.
Oxidation or as most people call it rust, is the process in which oxygen mixes with other substances or chemicals they attach to. Such as in iron it is slow burning process which results in rust, which can be dark orange or brown.
As for copper it results in a green color/coating called copper oxide. The copper oxide does not weaken the copper but puts a greenish coating on it.
The Statue of Liberty is originally made of
copper. Through the years it has developed a thick green coating of copper oxide.
Oxidized copper often forms a green hue or patina.
This is the same process a penny goes through.
Carbonic acid or carbonation
is a very mild acid, however it can do a lot of damage. Leaving a penny in a soft drink will clean it, but if you leave it in too long the penny will eventually dissolve.
The result is you can clean a penny with soda but if you leave it in soda for to long it will dissolve.
Source 1-
Source 2-
Source 3-
By :
Breanna Green
Full transcript