Chemistry
What is the most abundant halogen found in the Earth's crust?
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Praseodymium on the periodic table is noted by which symbol?
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What element is the basis for organic chemistry, as it occurs in all living organisms?
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What is the name of the temperature at which Helium I becomes Helium II?
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Which is a chemical often injected into lips for plastic surgery?
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A compound or molecule that is composed of carbon, oxygen and hydrogen best fits which science term?
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What major chemical other than chlorine is used to purify water of microorganisms?
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What is the most commonly encountered form of silver?
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