Chemistry

How many degrees of unsaturation are in the compound C2H4?

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What element was known in ancient times and referred to in Genesis as "brimstone"?
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What are electrically charged atoms called?
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Which of these is a significant greenhouse gas?
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Which of the following is produced in alkaline scrubbing and called wet slurry?
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Which of those would you use to perform a metathesis reaction?
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What is often used in advertising signs and produces a bright reddish-orange light?
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Who discovered calcium and barium?
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What phenomenon explains why cyclohexatriene does not exist?
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