Chemistry
What gas in excited state is responsible for the bright red and yellow-green colors of the aurora?
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What is the approximate heat of vaporization of water at its boiling point?
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What symbol appears on the periodic table for Calcium which has the atomic number 20?
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What is the symbol used on the periodic table for the element Lawrencium?
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Which of these can take on either a positive or negative charge, typically being a protein?
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Which of these chemicals is often used to reduce phosphates in water?
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