Chemistry
What isotope of carbon can be used to figure out how old some objects are or when something died?
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What is the most common chemical element found in the Earth's atmosphere?
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What is the symbol used on the periodic table for the element Protactinium?
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What substance is industrially prepared by the Haber Process?
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Approximately how many toxic chemicals are released while a diesel engine idles?
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What symbol appears on the periodic table for the element with the atomic number 92?
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What happens to water when it gets close to freezing?
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