Question 1

Which of the following best explains why heavier elements don't form in first-generation stars?

Accepted Answer

A)   The concentration of reactants is not high enough.
B)   The heavier elements are only made in a supernova.
C)   The spectrum of the star contains too much red.
D)   Second generation stars are hotter.
E)   There are free neutrons in a 1st generation star.F) B) and D)
G) None of the above

Question 2

Fission power produces unstable nuclides which have varying half-lives. One common product is cesium, with several different nuclides being produced. One nuclide that is problematic is 137Cs which decays by  β\betaβ  emission with a half-life of 30.2 years. How many years will it take for 1.5 kg of 137Cs to decompose to only 12 g of 137Cs?(If needed, use the following equation: 137Cs which decays by  \beta  emission with a half-life of 30.2 years. How many years will it take for 1.5 kg of 137Cs to decompose to only 12 g of 137Cs?(If needed, use the following equation:     )  A)  60.4 B)  181.2 C)  210.4 D)  213.4 E)  240.6 " class="answers-bank-image d-inline" rel="preload" > 137Cs which decays by  \beta  emission with a half-life of 30.2 years. How many years will it take for 1.5 kg of 137Cs to decompose to only 12 g of 137Cs?(If needed, use the following equation:     )  A)  60.4 B)  181.2 C)  210.4 D)  213.4 E)  240.6 " class="answers-bank-image d-inline" rel="preload" > )

Accepted Answer

A)   60.4
B)   181.2
C)   210.4
D)   213.4
E)   240.6 F) A) and E)
G) A) and D)

Question 3

How is electricity made from the energy released at a nuclear power plant?

Accepted Answer

A)   via hot water
B)   via steam
C)   via heavy water
D)   via refrigeration
E)   via cooling towersF) A) and E)
G) B) and D)

Question 4

Seaborgium (Z= 106)  can be synthesized by the bombardment of 249Cf with 16O. If four (4)  neutrons are produced in the reaction, what is the mass number of the Sg nuclide?

Accepted Answer

A)   259
B)   260
C)   261
D)   262
E)   264F) A) and B)
G) All of the above

Question 5

Strontium-90 decays by   β\betaβ  emission. Which of the following is the decay product?

Accepted Answer

A)   
B)   
C)   
D)   
E)    F) A) and C)
G) C) and D)

Question 6

Neutron-capture reactions are

Accepted Answer

A)   endothermic, and only occur at high temperature.
B)   exothermic, as neutron is attracted by strong nuclear force.
C)   exothermic, as they are spontaneous.
D)   result in stable reaction products.E) C) and D)
F) B) and C)

Question 7

What is the definition of critical mass?

Accepted Answer

A)   mass needed to start a nuclear bomb
B)   mass with a neutron recapture ratio of 1
C)   mass with a neutron recapture ratio less than 1
D)   mass needed to be detected by airport security
E)   mass needed to start a nuclear reactorF) A) and C)
G) A) and E)

Question 8

Which force is responsible for repulsions in the nucleus?

Accepted Answer

A)   gravitational force
B)   electrical force
C)   magnetic force
D)   strong nuclear force
E)   the star wars forceF) C) and D)
G) None of the above

Question 9

Which nuclei would undergo neutron capture and subsequent decay to produce 99Tc, two  γ\gammaγ  particles and one  β\betaβ particle?

Accepted Answer

A)   106Ag
B)   107Ag
C)   99Mo
D)   98Mo
E)   98Ru F) B) and E)
G) A) and B)

Question 10

222Rn is an unstable nucleus that is hazardous. Several pathways are known for its decomposition. One is  β\betaβ  - α\alphaα - β\betaβ - α\alphaα - β\betaβ - β\betaβ . The product nuclide is

Accepted Answer

A)   210Tl.
B)   210Pb.
C)   210Po.
D)   214Po.
E)   206Tl. F) C) and E)
G) A) and D)

Question 11

Fusion is important

Accepted Answer

A)   as a current method of producing electricity.
B)   for understanding the formation of the elements.
C)   for triggering fission bombs.
D)   b and c.
E)   as an energy source for space programs.F) C) and D)
G) B) and C)

Question 12

Which of the following factors limit the radio-dating techniques?

Accepted Answer

A)   The half-life of the isotope.
B)   The amount of background radiation.
C)   The quantity of sample.
D)   all of the above
E)   none of the aboveF) D) and E)
G) A) and B)

Question 13

Seborgium's most stable isotope contains one-hundred-six protons and one-hundred-fifty-seven neutrons. This nuclide's symbol is

Accepted Answer

A)    .S
B)   
C)   
D)   
E)   F) A) and C)
G) A) and B)

Question 14

All waste from a nuclear fission reactor

Accepted Answer

A)   are solid and composed of the daughter products of the fission reaction.
B)   can be safely disposed of as they are composed of low grade radioactive materials.
C)   include thermal waste in the form of warm water.
D)   result from melt down of the reactor.
E)   is radioactive and poses a potential threat to the environment.F) A) and E)
G) None of the above

Question 15

The REM unit

Accepted Answer

A)   represents the total energy of radiation absorbed.
B)   describes the effect of radiation on living humans.
C)   is the amount of radiation necessary to treat food products.
D)   accounts for the different properties of different types of radiation.
E)   only applies to alpha emissions.F) B) and D)
G) D) and E)

Question 16

238U is an unstable nuclide that undergoes multiple decay events. One sequence is  β\betaβ  -  β\betaβ  -  α\alphaα  -  α\alphaα  -  α\alphaα  . The product nuclide is

Accepted Answer

A)   220Rn.
B)   222Rd.
C)   218Po.
D)   222Rn.
E)   220Rd. F) A) and C)
G) A) and B)

Question 17

What radioactive particle do you need to be concerned about that can go through clothing but not through your body?

Accepted Answer

A)   alpha
B)   beta positive
C)   beta negative
D)   gamma
E)   neutronF) C) and E)
G) A) and B)

Question 18

Radioactive waste nuclides with short half-lives are usually less of a problem for disposal because they are quite active but only for a short time. For example, 134 Cs has a half-life of 2.1 years. If initially there were 1.5 kg of 134Cs, how much of this nuclide would be present in 14.7 years?(If needed, use the following equation: 134 Cs has a half-life of 2.1 years. If initially there were 1.5 kg of 134Cs, how much of this nuclide would be present in 14.7 years?(If needed, use the following equation:     )  A)  1.2 kg B)  120 g C)  12 g D)  10 g E)  14.7 g" class="answers-bank-image d-inline" rel="preload" > 134 Cs has a half-life of 2.1 years. If initially there were 1.5 kg of 134Cs, how much of this nuclide would be present in 14.7 years?(If needed, use the following equation:     )  A)  1.2 kg B)  120 g C)  12 g D)  10 g E)  14.7 g" class="answers-bank-image d-inline" rel="preload" > )

Accepted Answer

A)   1.2 kg
B)   120 g
C)   12 g
D)   10 g
E)   14.7 gF) A) and E)
G) A) and D)

Question 19

Typically how old can an artifact found in an archeological dig be and still allow you to use Carbon-14 dating to analyze its age? (14C, t1/2 = 5730 years.) (If needed, use the following equations: 14C, t1/2 = 5730 years.) (If needed, use the following equations:     )  A)  1 half-life B)  2 half-lives C)  4 half-lives D)  5 half-lives E)  can use it to determine the age of anything." class="answers-bank-image d-inline" rel="preload" > 14C, t1/2 = 5730 years.) (If needed, use the following equations:     )  A)  1 half-life B)  2 half-lives C)  4 half-lives D)  5 half-lives E)  can use it to determine the age of anything." class="answers-bank-image d-inline" rel="preload" > )

Accepted Answer

A)   1 half-life
B)   2 half-lives
C)   4 half-lives
D)   5 half-lives
E)   can use it to determine the age of anything.F) B) and D)
G) D) and E)

Question 20

Nuclei that lie below the belt of stability are characterized by

Accepted Answer

A)   high numbers of neutrons.
B)   low neutron to proton ratio.
C)   high neutron to proton ratio.
D)    α\alphaα  particle emission.
E)   green colours. F) A) and E)
G) C) and D)

Exam 21: Nuclear Chemistry and Radiochemistry

The REM unit

Correct Answer
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Fusion is important

Correct Answer
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Strontium-90 decays by $\beta$ emission. Which of the following is the decay product?

Correct Answer
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Correct Answer
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Which of the following best explains why heavier elements don't form in first-generation stars?

Correct Answer
verified

²³⁸U is an unstable nuclide that undergoes multiple decay events. One sequence is $\beta$ - $\beta$ - $\alpha$ - $\alpha$ - $\alpha$ . The product nuclide is

Correct Answer
verified

Neutron-capture reactions are

Correct Answer
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All waste from a nuclear fission reactor

Correct Answer
verified

Correct Answer
verified

Nuclei that lie below the belt of stability are characterized by

Correct Answer
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What is the definition of critical mass?

Correct Answer
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Seaborgium (Z= 106) can be synthesized by the bombardment of ²⁴⁹Cf with ¹⁶O. If four (4) neutrons are produced in the reaction, what is the mass number of the Sg nuclide?

Correct Answer
verified

How is electricity made from the energy released at a nuclear power plant?

Correct Answer
verified

²²²Rnis an unstable nucleus that is hazardous. Several pathways are known for its decomposition. One is $\beta$ - $\alpha$ - $\beta$ - $\alpha$ - $\beta$ - $\beta$ . The product nuclide is

Correct Answer
verified

Which force is responsible for repulsions in the nucleus?

Correct Answer
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What radioactive particle do you need to be concerned about that can go through clothing but not through your body?

Correct Answer
verified

Which nuclei would undergo neutron capture and subsequent decay to produce ⁹⁹Tc, two $\gamma$ particles and one $\beta$ particle?

Correct Answer
verified

Which of the following factors limit the radio-dating techniques?

Correct Answer
verified

Typically how old can an artifact found in an archeological dig be and still allow you to use Carbon-14 dating to analyze its age? (¹⁴C, t_1/2 = 5730 years.) (If needed, use the following equations: )

Correct Answer
verified

Seborgium's most stable isotope contains one-hundred-six protons and one-hundred-fifty-seven neutrons. This nuclide's symbol is

Correct Answer
verified

Exam 21: Nuclear Chemistry and Radiochemistry

The REM unit

Correct AnswerverifiedShow Answer

Fusion is important

Correct AnswerverifiedShow Answer

Strontium-90 decays by β\betaβ emission. Which of the following is the decay product?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following best explains why heavier elements don't form in first-generation stars?

Correct AnswerverifiedShow Answer

238U is an unstable nuclide that undergoes multiple decay events. One sequence is β\betaβ - β\betaβ - α\alphaα - α\alphaα - α\alphaα . The product nuclide is

Correct AnswerverifiedShow Answer

Neutron-capture reactions are

Correct AnswerverifiedShow Answer

All waste from a nuclear fission reactor

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Nuclei that lie below the belt of stability are characterized by

Correct AnswerverifiedShow Answer

What is the definition of critical mass?

Correct AnswerverifiedShow Answer

Seaborgium (Z= 106) can be synthesized by the bombardment of 249Cf with 16O. If four (4) neutrons are produced in the reaction, what is the mass number of the Sg nuclide?

Correct AnswerverifiedShow Answer

How is electricity made from the energy released at a nuclear power plant?

Correct AnswerverifiedShow Answer

222Rn is an unstable nucleus that is hazardous. Several pathways are known for its decomposition. One is β\betaβ - α\alphaα - β\betaβ - α\alphaα - β\betaβ - β\betaβ . The product nuclide is

Correct AnswerverifiedShow Answer

Which force is responsible for repulsions in the nucleus?

Correct AnswerverifiedShow Answer

What radioactive particle do you need to be concerned about that can go through clothing but not through your body?

Correct AnswerverifiedShow Answer

Which nuclei would undergo neutron capture and subsequent decay to produce 99Tc, two γ\gammaγ particles and one β\betaβ particle?

Correct AnswerverifiedShow Answer

Which of the following factors limit the radio-dating techniques?

Correct AnswerverifiedShow Answer

Typically how old can an artifact found in an archeological dig be and still allow you to use Carbon-14 dating to analyze its age? (14C, t1/2 = 5730 years.) (If needed, use the following equations: )

Correct AnswerverifiedShow Answer

Seborgium's most stable isotope contains one-hundred-six protons and one-hundred-fifty-seven neutrons. This nuclide's symbol is

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Strontium-90 decays by $\beta$ emission. Which of the following is the decay product?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

²³⁸U is an unstable nuclide that undergoes multiple decay events. One sequence is $\beta$ - $\beta$ - $\alpha$ - $\alpha$ - $\alpha$ . The product nuclide is

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Seaborgium (Z= 106) can be synthesized by the bombardment of ²⁴⁹Cf with ¹⁶O. If four (4) neutrons are produced in the reaction, what is the mass number of the Sg nuclide?

Correct Answer
verified

Correct Answer
verified

²²²Rnis an unstable nucleus that is hazardous. Several pathways are known for its decomposition. One is $\beta$ - $\alpha$ - $\beta$ - $\alpha$ - $\beta$ - $\beta$ . The product nuclide is

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which nuclei would undergo neutron capture and subsequent decay to produce ⁹⁹Tc, two $\gamma$ particles and one $\beta$ particle?

Correct Answer
verified

Correct Answer
verified

Typically how old can an artifact found in an archeological dig be and still allow you to use Carbon-14 dating to analyze its age? (¹⁴C, t_1/2 = 5730 years.) (If needed, use the following equations: )

Correct Answer
verified

Correct Answer
verified