Question 1

Which of the following statements regarding nuclear chemistry is correct?

Accepted Answer

A)  Most of the known nuclides are stable.
B)  There is no clear relationship between the stability of a radioactive nuclide and the combination of neutron and proton numbers in the nucleus.
C)  A nuclide is an atom with a specific atomic number, mass number, and neutron number.
D)  Nucleon is the term used to describe either a proton or an electron.
E)  Each element has only one isotope.

Question 2

When bombarded by a neutron, uranium-235 undergoes fission. If the nuclides produced are barium-141 and krypton-92, how many neutrons are emitted?

Accepted Answer

A)  none
B)  1
C)  2
D)  3
E)  4

Question 3

________ includes all forms of energy that originates from a source and travels through matter or space, such as visible light, X-rays, and radio waves. ________ is a property of ________ atoms that have an excess of matter, energy, or both.

Accepted Answer

Radiation;...

Question 4

Iridium-192 has a half-life of 74 days. What fraction of a sample of this isotope will remain after 222 days?

Accepted Answer

A)  1/2
B)  1/4
C)  1/3
D)  1/8
E)  1/16

Question 5

Select the most stable isotope from the following choices.

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 6

Carbon-14 decays by beta emission to form a new nuclide. Identify the new nuclide.

Accepted Answer

A)  nitrogen-14
B)  nitrogen-13
C)  carbon-12
D)  carbon-13
E)  beryllium-10

Question 7

Which process decreases the atomic number of an element by two?

Accepted Answer

A)  alpha particle emission
B)  beta particle emission
C)  positron emission
D)  gamma ray emission
E)  none of these

Question 8

Compare the decay of a 100.0 mg sample of iodine-131 (half-life = 8.0 days)to the decay of a 100.0 mg sample of phosphorus-32 (half-life = 14.3 days). After 15 days, which nuclide, I-131 or P-32, will have the greater number of atoms of the original nuclide?

Accepted Answer

To compare the decay of a 100.0 mg sampl...

Question 9

In the initial steps of the decay series for uranium-238, it emits 1 alpha particle, followed by 2 beta particles, and then 3 more alpha particles in six steps. Indicate the elemental symbol and the mass number of the final product.

Accepted Answer

The decay series for uranium-238 (U-238)...

Question 10

Bombardment of boron-10 with a projectile particle produces a nitrogen-14 atom and a gamma ray. What is the projectile particle?

Accepted Answer

A)  an alpha particle
B)  a beta particle (electron) 
C)  a positron
D)  a gamma ray
E)  a neutron

Question 11

The half-life of technetium-99 is 6.0 hours. How much of a 50.0 mg sample will remain after 24 hours?

Accepted Answer

A)  25.0 mg
B)  12.5 mg
C)  6.25 mg
D)  3.12 mg
E)  none of the sample will remain

Question 12

Boron is used in control rods in nuclear reactors to absorb neutrons. What are the mass number and the atomic number of the missing particle in the following reaction?  +  →  + _____

Accepted Answer

The answer of Boron is used in control rods in...

Question 13

What is the missing symbol in the following nuclear transformation?  +  → ______

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 14

Which of the following statements regarding the possible effects of radiation on a cell is incorrect?

Accepted Answer

A)  Radiation can pass through a cell with no damage.
B)  Radiation can damage a cell, but it is possible for the cell to repair the damage.
C)  Radiation may damage a cell so severely that it cannot repair itself.
D)  A damaged cell may mutate, and cause cancer.
E)  The degree of damage does not depend on the ionizing ability of the radiation.

Question 15

Write a nuclear equation for the fusion of two hydrogen-2 atoms to form helium-3 and one or more neutrons. How many neutrons are formed?

Accepted Answer

The fusion of two hydrogen-2 (deuterium)...

Question 16

Which of the following statements regarding nuclear chemistry is correct?

Accepted Answer

A)  Atoms with the same mass number but different atomic numbers are called isotopes.
B)  All isotopes are radioactive.
C)  Radioactive decay always results in the emission of an alpha particle.
D)  Radioactive decay processes result in a change in the nucleus of the isotope undergoing reaction.
E)  A nuclear particle (a proton or neutron) is called a nuclide.

Question 17

Carbon-11 radioactively decays by positron emission with a half-life of 20.4 minutes. If a dosage of carbon-11 is administered to a patient for a PET scan, what percentage of carbon-11 will remain in the patient's system after 81.6 min?

Accepted Answer

A)  75.0%
B)  12.5%
C)  87.5%
D)  25.0%
E)  6.25%

Question 18

Potassium-40 decays by beta emission to form a new nuclide. Identify the new nuclide.

Accepted Answer

A)  argon-40
B)  chlorine-36
C)  calcium-40
D)  calcium-39
E)  phosphorus-38

Question 19

Why is radon gas dangerous?

Accepted Answer

A)  It reacts chemically with lung tissue.
B)  It emits gamma rays.
C)  It undergoes fusion reactions, producing lots of energy.
D)  It undergoes fission reactions at a very high rate.
E)  Its decay products are radioactive solids that can attach to lung tissue and cause cell damage upon decay.

Question 20

Strontium-90 has a half-life of 28 years. How long will it take for 75% of the isotope to decay?

Accepted Answer

A)  28 years
B)  14 years
C)  42 years
D)  56 years
E)  84 years

Exam 15: Nuclear Chemistry

Which of the following statements regarding nuclear chemistry is correct?

Correct AnswerverifiedShow Answer

________ includes all forms of energy that originates from a source and travels through matter or space, such as visible light, X-rays, and radio waves. ________ is a property of ________ atoms that have an excess of matter, energy, or both.

Correct AnswerverifiedRadiation;...View AnswerShow Answer

Strontium-90 has a half-life of 28 years. How long will it take for 75% of the isotope to decay?

Correct AnswerverifiedShow Answer

Iridium-192 has a half-life of 74 days. What fraction of a sample of this isotope will remain after 222 days?

Correct AnswerverifiedShow Answer

Why is radon gas dangerous?

Correct AnswerverifiedShow Answer

Boron is used in control rods in nuclear reactors to absorb neutrons. What are the mass number and the atomic number of the missing particle in the following reaction? + → + _____

Correct AnswerverifiedShow Answer

What is the missing symbol in the following nuclear transformation? + → ______

Correct AnswerverifiedShow Answer

When bombarded by a neutron, uranium-235 undergoes fission. If the nuclides produced are barium-141 and krypton-92, how many neutrons are emitted?

Correct AnswerverifiedShow Answer

In the initial steps of the decay series for uranium-238, it emits 1 alpha particle, followed by 2 beta particles, and then 3 more alpha particles in six steps. Indicate the elemental symbol and the mass number of the final product.

Correct AnswerAnswered by ExamLex AIThe decay series for uranium-238 (U-238)...View AnswerShow Answer

Bombardment of boron-10 with a projectile particle produces a nitrogen-14 atom and a gamma ray. What is the projectile particle?

Correct AnswerverifiedShow Answer

Which of the following statements regarding nuclear chemistry is correct?

Correct AnswerverifiedShow Answer

Select the most stable isotope from the following choices.

Correct AnswerverifiedShow Answer

Write a nuclear equation for the fusion of two hydrogen-2 atoms to form helium-3 and one or more neutrons. How many neutrons are formed?

Correct AnswerAnswered by ExamLex AIThe fusion of two hydrogen-2 (deuterium)...View AnswerShow Answer

Compare the decay of a 100.0 mg sample of iodine-131 (half-life = 8.0 days)to the decay of a 100.0 mg sample of phosphorus-32 (half-life = 14.3 days). After 15 days, which nuclide, I-131 or P-32, will have the greater number of atoms of the original nuclide?

Correct AnswerAnswered by ExamLex AITo compare the decay of a 100.0 mg sampl...View AnswerShow Answer

Which of the following statements regarding the possible effects of radiation on a cell is incorrect?

Correct AnswerverifiedShow Answer

Which process decreases the atomic number of an element by two?

Correct AnswerverifiedShow Answer

The half-life of technetium-99 is 6.0 hours. How much of a 50.0 mg sample will remain after 24 hours?

Correct AnswerverifiedShow Answer

Carbon-14 decays by beta emission to form a new nuclide. Identify the new nuclide.

Correct AnswerverifiedShow Answer

Carbon-11 radioactively decays by positron emission with a half-life of 20.4 minutes. If a dosage of carbon-11 is administered to a patient for a PET scan, what percentage of carbon-11 will remain in the patient's system after 81.6 min?

Correct AnswerverifiedShow Answer

Potassium-40 decays by beta emission to form a new nuclide. Identify the new nuclide.

Correct AnswerverifiedShow Answer

Correct Answer
verified

includes all forms of energy that originates from a source and travels through matter or space, such as visible light, X-rays, and radio waves. is a property of atoms that have an excess of matter, energy, or both.

Correct Answer
verified
Radiation;...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The decay series for uranium-238 (U-238)...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The fusion of two hydrogen-2 (deuterium)...
View Answer

Correct Answer
Answered by ExamLex AI
To compare the decay of a 100.0 mg sampl...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified