My controls were using the same amount of water, the same sized cups, and two equal sized pieces of every metal.
My variable was the different kinds of water. One piece of each metal was in salt water and and the other piece was in fresh water.
Materials: tap water, salt, 2 screws, 2 pieces of aluminum foil, 2 safety pins, 2 tin can lids, 8 cups.
Procedure:
1. Fill up eight cups with tap water. Make sure they are even.
2. Fill four of the cups with half a teaspoon of salt. Leave the other four alone.
3. Take the two pieces of tin foil. Put one piece in a cup of tap water. Put the other piece in a cup of salt water.
4. Take the two screws. Put one screw in a cup of tap water. Put the other screw in a cup of salt water.
5. Take the safety pins. Put one safety pin in a cup of tap water. Put the other safety pin in a cup of salt water.
5. Take the tin can lids. Put one tin can lid in a cup of tap water. Put the other tin can lid in a cup of salt water.
6. The final step is to wait and watch.
Will the materials in the salt water rust before the ones in just the tap water? Or vice versa? Find out by going to the results or do the experiment yourself.
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