Chemistry
Nitrogen on the periodic table is noted by which symbol?
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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 symbol appears on the periodic table for Thorium which has the atomic number 90?
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What is a combination of substances that still remain intact?
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What element, used in some types of paint, created a health risk to children who ate paint chips?
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What will happen to a bowl of ice cream left in the sun?
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