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I notice that the penny at the bottom is dirtier then the penny at the top.the penny is changing because the top ones are very clean but the bottom one are not, this because of the oxide.the penny at the top became clean as the penny goes up it becomes cleaner and cleaner.this is a physical change because when it was dirty we used some thing to clean it so it turns back to a clean penny and a physical change is when it can turn back to its form.

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I notice that the pennies in each row have different colors becauce it depends how much time the copper has been reacted with copper oxide

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I notice top of pennies because not get oxygen the change form color change and .pennies that physical change form the pennies and the trying show the clean don't have to change oxygen. the physical change because form into a nice were clean pennies because we clean pennies getting into the pennies the clean form pennies copper form the are change color.

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I notice that the top pennies look clean because its tying to show us that the clean ones got oxygen. I also notice that the bottom ones are dirty because they are tying to show us that the dirty ones did not get oxygen. These are changing because some don't have oxygen. This process is a Physical Change because you can still make the bottom ones cleaner.

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I notice that all of the pennies are different. The pennies on the top are changing into the dirty ones because the copper oxide is getting into the pennies copper. This process is a Physical Change because the pennies on the bottom can still go back into a nice clean penny

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I notice that the top pennies are cleaner than the botton pennies.The pennies rust is changing .The pennies are a physical change.I think the picture is showing us how the pennies are getting dirter.

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The pennies are changing colors.

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I NOTICED THAT THE PENNYS IN THE TOP ROWS ARE THE CLEANEST AND THE PENNYS IN THE BOTTOM ARE DIRTY.
T

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I noticeed that

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I noticed that at cup one

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I notice that the

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i notice that the pennies in cup 1  will turn shiny and clean cause the air will eveaporatre if you take the lid off and thenit will turn shiny and clean .

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I notice that the top pennies look clean because they are trying to shows us which got oxygen and which

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1. What do you notice about the pennies?

2. What is changing?

3. Is it physical or a chemical change??

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I notice the first penny is going to change colors cause of air and oxygen, and the the secand cup will not change colors!

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I notice that the top pennies look cleaner because they are trying to show us the difference when they cleaned the pennies. The dirty ones are at the bottom because they are showing us the progress how the pennies are getting cleaner. The pennies are getting cleaner from all the rust or dullness.

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I predict that the penny in cup 1 will be more clean than cup 2 because when vinegar reacts with the penny will have a shiny metal surface.

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I perdict that  the penny in cup 2 will be shinny because the penny is not that dirty and the vinigar will be able to react easy

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Copper oxide will be cleaned on the penny becuase it is not exposed to oxygen when it is covered.

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i predict that the pennies in the top will get more shiny when you use the vinigar it causes a chemical reation and cooper oxide will be going away

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I predict that the side that is faced to the paper towel will clean better because they get to obsorve more vinegar

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The top of the penny is shinier that the bottom of the penny.

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the pennys on the top are shinier than the others the ones at the bottom are dirtier because of the oxygen in the air and the ones in middle are mild

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The top of the pennies are clean and shiny but as it goes down it gets a lot of copper oxide so it gets messy.It needs air to get get copper oxide.

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The pennies at the top are shinier than all the others and the ones at the bottom are dirtier.

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As the pennies at the top go down they start to get dirty because they are mixing with oxygen and at the bottom the pennies are rusted and dirty.

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I notice that the top pennies are shiny and as they go down they get more dirty.

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The pennies are changing color. The pennies at the bottom look old and rusty. The pennies at the top look new an shiny.

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The pennys at the top are fresh and new. the pennys at the middle are dirty and not shiny. the pennys at the bottom are green and dull

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the pennies are differnt because some of the pennies have rust on them because the air toches the pennies

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In my observations i notice that the two pennies were rusty and not shinny but when they were put inside the vinegar with salt  they got shinny.

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My observation that I have lookin at is that some of them are shiny
lookin yyaaaaa

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The pennies on the top are white an clean an on the bottom are dirty and black. : { )

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The pennys were not claen they were dirty , but some of the top pennys were really shiny and clean they were the color gold.Vingar can clean the pennys when their dirty this is why the metal pennys wre cleaner than the bottom/lower metal pennys.This is what i observed with my eyes

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First, the pennies were looking a little rusty. Then the pennies turned shiny. ; {3

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In my observation I noticed that the pennies that were rusty and dirty got cleaner when vinegar was added because it got rid of the copper.

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In my observation i noticed that the pennies almost instantly  became clean and that the viniger is a type of acid that can get rid of the copper

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The pennies on the bottom look rusty, but the pennies on the top looks new.That is what is different about the pennies on the bottm than from the top.

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the pennys at the top are shiney and the lower ones are dirty rusty and old

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I can see the penny turning all dull looking but then it turns shiny and new looking

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The  first penny was clean  and dry and the other one was

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The pennies in the picture  look shiny and clean and the bottoms are blue or dark and dirty.

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Half of the pennies look shiny and smooth. The other half of the pennies look dull and not smooth.

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The penny change to rusty to shiney. At first I saw each penny was  rusty  but with the vineger and water made each penny clean.

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I see that from the bottom its nasty and when it start cleaning it .it  is so clean because the viniger cleans it and the nasty ones are not clean because the air

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The pennys were durty i put the pennys in the vinegar with water then the pennys were not durty they were clean and shiny.

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Some of the pennys in the picture look clean and shiny,  but the rest of the pennys look very very durty and at the bottom of picture the pennys look blue

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It looks like the penny is changeing color. Also it looks like first it was rusty. Then it was shiney.

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The picture shows some penny's that are clean and look smooth but at the bottom the penny's look old ,and rusty i tyhink that the penny's at the bottom are not smooth like the ones at the top.