Chemistry
What is the approximate heat of vaporization of water at its boiling point?
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A unit of measure of absorbed radiation is known as what?
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What is the fifth most abundant element in the universe after hydrogen, helium, oxygen and carbon?
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What is the symbol used on the periodic table for the element Promethium?
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What contain most of the calcium ion in the human body?
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Which branch of chemistry deals with the determination of the chemical composition of substances?
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Which of the following is used as a rating scale to grade gasoline?
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What is the third most abundant gas in the earth's atmosphere?
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What is a method to indicate reactants and products of a chemical reaction using chemical formulas?
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