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We couldn't control the exact shape of the ridges and such on the penny

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We couldn't control how dirty or rusty the coin was so it could be unlevel. If we did control this then we could bring lots of pennies.

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One variable we couldn't control was the amount of amount of rust on the coin. The rust could have taken up space where the water could have gone.

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We could buy new penny's in the future and put them on the same side. And also so that they don't have any rust on them.

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One variable that we couldn't control was the water. One way way could control that in the future is using the same penny and dropping the water at the same height every time

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One variable we couldn't control in this experiment was the amount of rust on the coin. It could have made it less adhesive and added tiny bumps that could have offset the water. But one way we could have controlled it is it we had 2 brand new coins that had no rust on it.

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We couldn't control the temperature of the water because we didn't have any of the materials such as a thermometer, or ice to keep it at a steady temperature.

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one thing that we can change was how fast we dropped the water

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one veriable we can control is how fast you drop the water on the penny another on is how much soap you put in the water.

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a variable we cannot control is the slight differences in area/shape of the penny, we can control it better next time by measuring and comparing two pennies that look very similar.

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One variable we couldn't control was the speed the solution was dropped. You could control it by having a machine drop the solution at the same speed each time.

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I can't control on wasting paper towels.  We can not waste paper towels, we need to save paper towels.  In the future, we should not use paper towels, we should use reusable wood so after the lab, we don't have to throw it away, we would just clean it and use it again for the next lab.

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A variable we couldn't control was the exact speed of the water dropping onto the penny and the exact distance from the penny to the pipette. This is because we aren't machines and can't exactly drop the water at the exact speed, or drop it from the same height because our hand may shake or we accidentally move it.
If I had another chance at redoing the lab, I would get a machine to do the dropping to get more accurate results.

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One vriable

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We could not control how level the paper towel was. We might be able to control it if we put something heavy on the corners or did not use a paper towel at all.

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A variable that we could not control are the coins because we cannot have two of the exact same coin. Ideally, we would have two recently made coins rather than coins made ten years apart or so

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We could not control how fast the water dropped onto the penny. If we had a lot more money, we could possibly build a robot that would be able to do that much more precisely than a human could.

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The variables that you can control are how fast you drop the penny and how how high you drop the water from. The variable you can't control is how corroded the penny was.

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The

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One variable you could not control was the different bumps on both sides of the penny. How you could control this variable in the future is by making sure you are using the same side for both pennies.

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One variable we couldn't control was the speed of the water dropping and what height it dropped from. If we did this experiment again we could make a robot that drops water from the same heigh and speed every time.

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One variable we could not control was the speed of the water droplet falling. We can control that by making a robot and having him/her do it for us

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Please write...
1. One variable you couldn't control and why.
2. How you could control that variable in the future.