Potassium-40 decays to argon-40 with a half-life of 1.27 × 109 yr. The age of a mineral sample that has a mass ratio of 40Ar to 40K of 0.412 is ________ y.

A) 1.62 × 109 B) 5.23 × 108 C) 7.55 × 108 D) 2.26 × 109 E) 6.32 × 108 A) 1.62 × 109 B) 5.23 × 108 C) 7.55 × 108 D) 2.26 × 109 E) 6.32 × 108

Exam 19: Radioactivity and Nuclear Chemistry

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Strontium-90 is a byproduct in nuclear reactors fuelled by the radioisotope uranium-235. The half-life of strontium-90 is 28.8 y. What percentage of a strontium-90 sample remains after 85.0 y.?

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Question 21

Which of the following statements is TRUE?

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Question 22

Complete the following equation of nuclear transmutation. U + C → Cf + 6 ________

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Question 23

Potassium-40 decays to argon-40 with a half-life of 1.27 × 10⁹ yr. The age of a mineral sample that has a mass ratio of ⁴⁰Ar to ⁴⁰K of 0.412 is ________ y.

(Multiple Choice)

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Question 24

Determine the identity of the daughter nuclide from the beta decay of P.

(Multiple Choice)

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Question 25

Define radioactivity.

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Question 26

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.

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Question 27

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

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Question 28

Complete the following equation of transmutation. N + He → O + ________

(Multiple Choice)

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Question 29

Which of the following statements is TRUE?

(Multiple Choice)

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Question 30

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

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Question 31

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

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Question 32

Determine the identity of the daughter nuclide from the electron capture by Be.

(Multiple Choice)

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Question 33

If we start with 1.000 g of strontium-90, 0.8444 g will remain after 7.00 y. This means that the of strontium-90 is ________ y.

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Question 34

Complete the following equation of nuclear fusion. H + H → He + ________

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Question 35

Identify the radioactive green light that glows in the dark.

(Multiple Choice)

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Question 36

Determine the binding energy per nucleon of a Mg-24 nucleus. The Mg-24 nucleus has a mass of 23.985042 u. A proton has a mass of 1.00728 u, a neutron has a mass of 1.008665 u, and 1 u is equivalent to 931 MeV of energy.

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Question 37

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

(Multiple Choice)

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Question 38

Carbon-11 is used in medical imaging. The half-life of this radioisotope is 20.4 min. What percentage of a sample remains after 50.0 min?

(Multiple Choice)

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Question 39

Which of the following elements would be expected to be particularly stable?

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Question 40

Showing 21 - 40 of 116

Exam 19: Radioactivity and Nuclear Chemistry

Strontium-90 is a byproduct in nuclear reactors fuelled by the radioisotope uranium-235. The half-life of strontium-90 is 28.8 y. What percentage of a strontium-90 sample remains after 85.0 y.?

Which of the following statements is TRUE?

Complete the following equation of nuclear transmutation. U + C → Cf + 6 ________

Potassium-40 decays to argon-40 with a half-life of 1.27 × 109 yr. The age of a mineral sample that has a mass ratio of 40Ar to 40K of 0.412 is ________ y.

Determine the identity of the daughter nuclide from the beta decay of P.

Define radioactivity.

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.

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

Complete the following equation of transmutation. N + He → O + ________

Which of the following statements is TRUE?

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

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

Determine the identity of the daughter nuclide from the electron capture by Be.

If we start with 1.000 g of strontium-90, 0.8444 g will remain after 7.00 y. This means that the of strontium-90 is ________ y.

Complete the following equation of nuclear fusion. H + H → He + ________

Identify the radioactive green light that glows in the dark.

Determine the binding energy per nucleon of a Mg-24 nucleus. The Mg-24 nucleus has a mass of 23.985042 u. A proton has a mass of 1.00728 u, a neutron has a mass of 1.008665 u, and 1 u is equivalent to 931 MeV of energy.

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

Carbon-11 is used in medical imaging. The half-life of this radioisotope is 20.4 min. What percentage of a sample remains after 50.0 min?

Which of the following elements would be expected to be particularly stable?

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Potassium-40 decays to argon-40 with a half-life of 1.27 × 10⁹ yr. The age of a mineral sample that has a mass ratio of ⁴⁰Ar to ⁴⁰K of 0.412 is ________ y.

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.