Chemistry
What is the symbol used on the periodic table for the element Lawrencium?
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The Air-Quality Index measures exposure in the air at ground-level to which chemical?
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Which of the following substances is industrially prepared by the contact process?
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What is added to drinking water and to swimming pools to serve as a disinfectant?
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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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