Tue, Mar 01, 2022 11:32 AM in Pennies, Aluminum, and Vinegar reactions
As a quick follow-up, it is possible that the cups we used were previously contaminated with salt and not washed properly. I am not sure. I just set up a new experiment with sanded and unsanded pennies, salt and no salt added to the vinegar. They are bubbling away right now.
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Tue, Mar 01, 2022 11:10 AM in Pennies, Aluminum, and Vinegar reactions
I am a new teacher teaching science to grades 6-8. In 8th grade, we have been exploring chemical and physical changes. They recently ran an experiment where they sanded the edges of pennies minted after 1985 and submerged them in white vinegar along with a 2x2 cm square of aluminum foil. They observed the bubbles forming on the edges of the pennies and saw nothing happen with the foil, which is w...
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