Some chemistry jokes

Thanks to...someone policy forbids me to mention.

Two guys walk into a bar. The first guy says, "I'll have some H20." The second guy says, "I'll have some H20, too."

The second guy died.

[H2O2 is hydrogen peroxide.]


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Then there's this oldie but goodie:

Little Johnny was a chemist
Little Johnny is no more
For what he thought was HO2
Was H2SO4.

[H2SO4 is sulfuric acid.]