Chemistry
What is the fifth most abundant element in the universe after hydrogen, helium, oxygen and carbon?
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What is the third most abundant gas in the earth's atmosphere?
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What is a chemical or physical agent that tends to cause cancers?
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What process causes molecules to move into areas that have fewer molecules?
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What symbol appears on the periodic table for the element with the atomic number 70?
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What alkaline earth metal is formed from the decay of uranium?
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What word means "two or more types of matter are evenly distributed in a mixture"?
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Which of these chemicals is often used to reduce phosphates in water?
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