Chemistry
What major chemical other than chlorine is used to purify water of microorganisms?
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What is a chemical or physical agent that tends to cause cancers?
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What word means "two or more types of matter are evenly distributed in a mixture"?
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A unit of measure of absorbed radiation is known as what?
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Beryllium, magnesium, calcium, strontium, barium, and radium consist what group of elements?
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What transition metals are the only elements known to produce a magnetic field?
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