Chemistry

Chemistry, 14.07.2019 13:40, hunterdylan01

Of the rock's original uranium-235 remains. how old is the rock

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Chemistry, 26.06.2019 10:10, millie54

Arock is found to contain 2.2 grams of uranium-235, a radioactive isotope. if the rock has undergone 2.75 half-lives, what was the original amount of uranium-235 in the rock and how old is the rock

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Mathematics, 01.08.2019 07:00, dontcareanyonemo

Suppose you find a rock and measure that 12.5% of the original uranium-235 still remains it, while the other 87.5% has decayed into lead-207. about how old is the rock?

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Mathematics, 12.10.2019 18:30, lolo15xxx

Radioactive uranium-235 has a half-life of about 700 million years. suppose you find a rock and chemical analysis tells you that only one sixteenth of the rock's original uranium-235 remains. how old is the rock? a. 2.8 billion years old b. 1.4 billion years old c. 175 million years old d. 2.1 billion years old e. 3.5 billion years old f. 350 million years old

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Chemistry, 25.10.2019 17:43, rehel1546

You are dating moon rocks based on their proportions of uranium-238 (half-life of about 4.5 billion years) and its ultimate decay product, lead. 1.find the age for a rock for which you determine that 58% of the original uranium-238 remains, while the other 42% has decayed into lead. t=( ) billion years 2.find the age for a rock for which you determine that 66% of the original uranium-238 remains, while the other 34% has decayed into lead. t=( ) billion years

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