Exam 21: Radioactivity and Nuclear Chemistry

A geological sample is found to have a Pb-206/U-238 mass ratio of 0.337/1.00.Assuming there was no Pb-206 present when the sample was formed,how old is it? The half-life of U-238 is 4.5 × 10⁹ years.

Determine the identity of the daughter nuclide from the alpha decay of Po.

The combination of two light nuclei to form a heavier nuclei is called

Identify the instrument(s)used to detect radiation.

The following reaction represents what nuclear process? Cs + e → Xe

If we start with 1.000 g of cobalt-60,0.270 g will remain after 10.0 yr.This means that the half-life of cobalt-60 is ________ yr.

Nuclides above the valley of stability can become more stable through which of the following processes?

Identify the highest natural radiation.

A rock contains 0.112 mg of lead-206 for each milligram of uranium-238.The half-life for the decay of uranium-238 to lead-206 is 4.5 × 10⁹ yr.The rock was formed ________ yr ago.

Complete the following equation of transmutation. Al + He → P + ______

Write a nuclear equation to describe the spontaneous fission of Am to form I-134 and Mo-107. Determine how many neutrons are produced in the reaction.

Write a nuclear equation for the alpha decay of U.

Determine the identity of the daughter nuclide from the alpha decay of Rn.

Which of the following nuclides is most likely to undergo beta decay?

In addition to a beta particle,what is the other product of beta decay of Tl?

Identify the missing particle in the following nuclear equation: Pb → e + ?

Which of the following nuclides are most likely to decay via beta decay?

An archaeologist graduate student found a leg bone of a large animal during the building of a new science building.The bone had a carbon-14 decay rate of 14.8 disintegrations per minute per gram of carbon.Living organisms have a decay rate of 15.3 disintegrations per minute.How old is the bone?

You have an unknown radioactive material.If you start out with a 405 mg sample,and after 120 minutes 53.1 mg remains,what is the half life?

Which particle has the highest penetrating power?