Chemistry
What is the fifth most abundant element in the universe after hydrogen, helium, oxygen and carbon?
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What term is used for military use of harmful biological agents?
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Which scientist was the first to discover that for DNA, "A=T and C=G"?
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What symbol appears on the periodic table for the element with the atomic number 10?
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Which is a chemical often injected into lips for plastic surgery?
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What element was known in ancient times and referred to in Genesis as "brimstone"?
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The Diels-Alder reaction is an example of which class of reactions?
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Gold, silver, lead, and copper exhibit the properties of which of the following crystal systems?
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