Chemistry
What halogen is extremely rare and is considered one of the rarest naturally occurring elements on Earth?
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Which scientist was the first to discover that for DNA, "A=T and C=G"?
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What will happen to a bowl of ice cream left in the sun?
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High levels of what chemical may be in trailers provided for people displaced by Hurricane Katrina?
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Beryllium, magnesium, calcium, strontium, barium, and radium consist what group of elements?
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What precious metal is most commonly used in catalytic converters for cars?
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Silver chloride and silver nitrate are both chemicals that darken with exposure to what?
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