As an ion chromatography chemist I made this one up:
Anions aren't negative, they're just misunderstood.
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Two chemists go into a restaurant.
The first one says "I think I'll have an H2O."
The second one says "I think I'll have an H2O too" - and he died.
Q: What do you get when you complete science class?
A: A graduated cylinder.
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Little Johnny's Chemistry teacher wanted to teach his class a lesson about the evils of liquor, so he set up an experiment that involved a glass of water, a glass of whiskey, and two worms.
"Now, class. Observe what happens to the two the worms," said the professor putting the first worm in the glass of water.
The worm in the water moved about, twisting and seemingly unharmed.
He then dropped the second work in the whiskey glass.
It writhed in pain for a moment, then quickly sank to the bottom and died.
"Now kids, what lesson can we derive from this experiment?" he asked.
Little Johnny raised his hand and wisely responded, "Drink whiskey and you won't get worms!"
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Don't trust atoms, they make up everything.
Q: What happened to the man who was stopped for having sodium chloride and a nine-volt in his car?
A: He was booked for a salt and battery.
If you're not part of the solution, you're part of the precipitate.
Chuck Norris destroyed the periodic table, because Chuck Norris only recognizes the element of surprise.
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Q: What is the chemical formula for "banana"?
A: BaNa2
If the Silver Surfer and Iron Man team up, they'd be alloys.