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Some chemicals react with the air, or are volatile and would escape. Others might be dangerous if the bottle falls over and the chemical spills out.

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Q: Why are bottle of chemicals kept tightly closed except when a quantity of chemical is being removed?
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Why are bottles of chemicals kept tightly closed except when a quantity of chemical is being removed?

They are kept tightly closed so there is less chance of contamination and if the bottle gets knocked over, its contents will not spill.


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