Chemistry
What is the chemical symbol for Helium?
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What is the molecular geometry of the molecule sulfur hexafluoride?
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What symbol appears on the periodic table for Thorium which has the atomic number 90?
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Which of these can take on either a positive or negative charge, typically being a protein?
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What is the name for naturally-occurring alloy of gold and silver with a small amount of other metals?
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What element was known in ancient times and referred to in Genesis as "brimstone"?
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What is a compound or mixture of chemical compounds that is used to maintain a steady pH?
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What is the third most abundant gas in the earth's atmosphere?
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Which of the following analytical techniques gives an "ion peak"?
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