Chemistry
What is the second most abundant element by mass (about 18.5%) in the human body?
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What element is the basis for organic chemistry, as it occurs in all living organisms?
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High levels of what chemical may be in trailers provided for people displaced by Hurricane Katrina?
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What compounds that are soluble in water are classed as bases?
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What is the symbol used on the periodic table for the element Chlorine?
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Which of these helps determine what state of matter a substance is in?
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Which is a chemical often injected into lips for plastic surgery?
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