Chemistry
What symbol appears on the periodic table for the element with the atomic number 18?
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What extremely flammable gas was associated with the famous explosion of the Hindenburg airship?
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Which of these is a heavy gas used in specialized electric lamps?
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What are substances that control the rates of chemical reactions?
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The Diels-Alder reaction is an example of which class of reactions?
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What is the name of a hydrocarbon with two carbons sp^2 hybridized?
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What is a vital constituent of plant and animal life, and is the key component of hemoglobin?
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Which is a chemical often injected into lips for plastic surgery?
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