Chemistry
What halogen is extremely rare and is considered one of the rarest naturally occurring elements on Earth?
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On which scale is the boiling point of water 80 degrees?
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What element was known in ancient times and referred to in Genesis as "brimstone"?
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Felix Hoffmann, not Bayer, first patented what remedy?
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What is the second-most abundant element in the universe, though it is much less common on Earth?
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What volume does 24 grams of ammonia gas occupy at standard temperature and pressure?
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