Cleaning for Pennies

You have been investigating chemical changes in matter. In this activity, you and your family members will observe a simple chemical change.




Ask an adult to help you pour about ¼ cup vinegar into the jar. Drop some of the pennies into the vinegar and put some of them aside for now. Let the dirty pennies sit for several hours. Take the pennies from the jar. Observe them. Now compare them with the pennies you set aside.


What happened to the pennies? Vinegar contains acetic acid. What do you think the vinegar did to the pennies?