Chemistry
Which of these can take on either a positive or negative charge, typically being a protein?
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What is used in manufacturing matches, fertilizers and pesticides, and in vulcanization of rubber?
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Which of these is the primary component of natural gas?
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What is the second most abundant element by mass (about 18.5%) in the human body?
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What symbol appears on the periodic table for Sulfur which has the atomic number 16?
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Heavy water contains what isotopic form of hydrogen?
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