Chemistry

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

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How many pounds of carbon dioxide are produced when a car burns one gallon of gas?
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Approximately how many toxic chemicals are released while a diesel engine idles?
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Which is true of pericyclic reactions?
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Under standard conditions, what periodic table group exists in all three main phases of matter?
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What is the usual ounce capacity of a jigger?
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Which of these objects has the most mass?
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What is the third most abundant gas in the earth's atmosphere?
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What would you call the treatment of disease, usually cancer, by chemical agents?
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