Chemistry
The first element on the periodic table of elements with an atomic number of 1 is?
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What allotrope of oxygen helps protect the biosphere from solar ultraviolet radiation?
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Which of the following is used as a rating scale to grade gasoline?
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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 is used in manufacturing matches, fertilizers and pesticides, and in vulcanization of rubber?
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What is formed when metals are blended with other metals?
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