Science-Clean Dirty Coins

http://www.sciencebob.com/experiments/pennychem.php
L.I- For students to be able to write a science report.

Wednesday in Science we are going to conduct the following experiment. We are hoping the items mixed together will create a chemical reaction and we shall see a change in the coins surface.
I wonder what would happen if we used differnet household items like lemon juice or Coke or toothpaste?
Would it make a difference to the experiment if I left the coins in the bowl of vinegar over night? What are your thoughts on this idea.

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