Poppa gave Gemma a chemistry lesson today.
He took a copper-plated zinc penny (post-1982), and filed the side.
Then, he put the penny in hydrochloric acid and we watched vapors rise off of it.
In this video, he’s showing her how the zinc and hydrochloride react to yield hydrogen. (It also yields zinc chloride, which is aqueous).
The result? A floating penny.
Why is it floating? Because it’s now hollow.
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