Chemistry

What isotope of carbon can be used to figure out how old some objects are or when something died?

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Which of the following is a metal?
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What happens to water when it gets close to freezing?
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Which mineral water company had to admit in 1990 that they artificially carbonated their product?
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What state of matter is air?
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Which of these is an element?
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What particle has a positive charge of 1 unit?
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Who discovered calcium and barium?
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What does the "T' represent in t-butyl?
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