Chemistry

When cutting onions what is released in the air that makes a person tear?

More Questions from Chemistry
What precious metal is most commonly used in catalytic converters for cars?
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Which of these is a chemical form of communication?
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What volume does 24 grams of ammonia gas occupy at standard temperature and pressure?
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What unit of measurement is one-thousandth of a gram?
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What is the chemical symbol for gold?
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What is often used in advertising signs and produces a bright reddish-orange light?
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What kind of gas is CO2?
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What is table salt's chemical name?
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