Chemistry
What is the fifth most abundant element in the universe after hydrogen, helium, oxygen and carbon?
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What is the term for rain that contains chemical pollutants?
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What is a vital constituent of plant and animal life, and is the key component of hemoglobin?
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What symbol appears on the periodic table for Oxygen which has the atomic number 8?
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When cutting onions what is released in the air that makes a person tear?
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What major chemical other than chlorine is used to purify water of microorganisms?
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What symbol appears on the periodic table for the element with the atomic number 14?
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