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Easy Elementary Science Projects: Cleaning A Copper Coin With Lemon Juice

This experiment is another of our easy elementary science projects that uses lemons or lemon juice. We are going to use lemon juice to react with the copper oxide and to remove it in that way. When a copper coin is exposed to the air it reacts with oxygen in the air to form copper oxide that gives the coin a dull appearance.

What you need for this easy elementary science project:

• 4 Tablespoons of lemon juice
• 2 dull copper coins
• A glass
• Water
• A soft cloth
• A camera

What you have to do for this project:

1. Take a photo of your coins before you start, making sure they are both more or less the same in color (dull)
2. Pour the lemon juice into a glass
3. Drop the coin into the lemon juice
4. Leave the coin in the lemon juice for about 5 minutes
5. Remove the coin from the lemon juice, rinse it clean and dry it with a soft cloth
6. What has happened?
7. Take a photo of both coins next to each other to show the difference.
8. Explain what has happened.

Doing easy elementary science projects are a lot of fun. If you want to make very sure you are following the proper scientific method it may be a good idea to get a good science fair project e-book. I have found Science Fair Projects Made Easy to be a very good one; you may want to have a look at it.

For more easy elementary science fair projects you can visit our Easy Science Fair Projects Blog And our Easy Science Fair Projects Website.

Examples Of Science Fair Projects - Air Pressure And Air Weight

Get more Science Fair Projects at Easy Science Fair Projects

This science project is one of our examples of science fair projects where you actually proof two related characteristics of air. You will prove that air has weight and that, because of the weight, air pressure is strong enough to bend a can. We are going to use the principle that as air heats up; it has a greater volume and if it is in a container some of the air will escape from the container. Then by screwing a top on the container we are going to prevent the air from going back in when the container cools down.

CAUTION: This example science fair project must be done with adult supervision as heat is used.

What you will need for this experiment:

• Large container
• A can with a screw top (you get cans of olive oil that will be the ideal can)
• Water
• Stove
• Oven mitts
• Ice
• Dish cloth
• A scale
• Note book
• Pen
• Camera

How to do this science experiment:

1. For your display, it is a good idea to take a photo of the can in its original state.
2. Fill the large container with water and ice and put it to one side until you need it.
3. With a finely calibrated scale, weigh the can with the screw top on.
4. Make a note of this weight.
5. Remove the screw top.
6. Put the can on the burner on the stove.
7. Heat the can until it is very hot.
8. Using the oven mitts, remove the can from the stove and, working quickly, screw the top on the can and place it in the cold water.
9. Observe what happens, write it down and take a photo.
10. When the can has cooled down, wipe it dry and weigh it.
11. Make a note of the weight and take a photo.
12. What has happened?
13. Why do you think it happened, remember we said in the beginning that we are going to prove two things?

What happens is that the air pressure bends the can. Why can we say that? What did we do to remove air from the can so that the air pressure on the outside is more than in the inside?

The other thing that happens is that the can now weighs less. Why is that? Think of what we have done with the air in the can.

This is just one of our many examples of science fair projects. For more fun and easy examples of science fair projects visit our site Easy Science Fair Projects.

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