Chemistry
Phosphorus and sulfur are the ingredients in what?
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The Diels-Alder reaction is an example of which class of reactions?
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What is the second most common metal on Earth, and the most widely-used metal?
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How many elements in the actinide series are not radioactive?
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Which of these chemicals is often used to reduce phosphates in water?
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What element in a liquid state is used in the cryogenic cooling of devices and materials?
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What gas in excited state is responsible for the bright red and yellow-green colors of the aurora?
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What is essential for calcium absorption by the human body?
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