Question 1

Relative to the sum of the masses of its constituent nucleons (neutrons + protons),the mass of a nucleus is

Accepted Answer

A) always greater. 
B) sometimes the same and sometimes smaller. 
C) always smaller. 
D) always the same. 
E) sometimes greater and sometimes smaller. 
A) always greater. 
B) sometimes the same and sometimes smaller. 
C) always smaller. 
D) always the same. 
E) sometimes greater and sometimes smaller.

Question 2

A sample of wood from an Egyptian mummy case gives a   count of 8.5 cpm/gC (counts per minute per gram of carbon).How old is the wood? (The initial decay rate of  
Is 15.3 cpm/g C,and its half-life is 5730 years.)

Accepted Answer

A)    years 
B)    years 
C)    years 
D)    years 
E) none of these 
A)    years 
B)    years 
C)    years 
D)    years 
E) none of these

Question 3

Which of the following statements is(are)true for the fission of uranium-235?

Accepted Answer

A) The electron is captured by the nucleus,which becomes unstable. 
B) The nuclides produced are more stable than the uranium nuclide. 
C) The nuclides produced are individually heavier than the uranium nuclide. 
D) The products include neutrons. 
E) Two of these statements are true. 
A) The electron is captured by the nucleus,which becomes unstable. 
B) The nuclides produced are more stable than the uranium nuclide. 
C) The nuclides produced are individually heavier than the uranium nuclide. 
D) The products include neutrons. 
E) Two of these statements are true.

Question 4

Which of the following particles cannot be accelerated to high speeds in a particle accelerator or cyclotron?

Accepted Answer

A) neutrons 
B) electrons 
C) protons 
D) alpha particles 
E) hydrogen nuclei 
A) neutrons 
B) electrons 
C) protons 
D) alpha particles 
E) hydrogen nuclei

Question 5

What is the decay constant for a particular radioactive element that has a half-life of 5.66 years?

Accepted Answer

A) 0.161/year 
B) 0.113/year 
C) 7.18 × 10-3/h 
D) 25.8/s 
E) 0.122/year 
A) 0.161/year 
B) 0.113/year 
C) 7.18 × 10-3/h 
D) 25.8/s 
E) 0.122/year

Question 6

Which of the following is the most likely mode of decay for the radioactive nuclide   ?

Accepted Answer

A) positron emission 
B) gamma radiation 
C) beta emission 
D) alpha emission 
E) neutron emission 
A) positron emission 
B) gamma radiation 
C) beta emission 
D) alpha emission 
E) neutron emission

Question 7

The isotope 210Pb has a half-life of 22 years.What percentage of a pure 210Pb sample prepared in April 1937 remains in April 1994?

Accepted Answer

A) 17% 
B) 26% 
C) 31% 
D) 21% 
E) 38% 
A) 17% 
B) 26% 
C) 31% 
D) 21% 
E) 38%

Question 8

What assumption must be true for radiocarbon (14C)dating to be useful?

Accepted Answer

A) (14
C)  has the same mass as 12C. 
B) A constant concentration of 14C is maintained in living plants and animals through equilibration with atmospheric levels of 14C. 
C) The sample cannot have been chemically altered prior to the analysis. 
D) (14
C)  always decays at the same rate. 
E) (14
C)  is nonradioactive. 
A) (14
C)  has the same mass as 12C. 
B) A constant concentration of 14C is maintained in living plants and animals through equilibration with atmospheric levels of 14C. 
C) The sample cannot have been chemically altered prior to the analysis. 
D) (14
C)  always decays at the same rate. 
E) (14
C)  is nonradioactive.

Question 9

When 103Pd undergoes electron capture,what is the product nuclide?

Accepted Answer

A) (103Ag) 
B) (101Rh) 
C) (107Ag) 
D) (103Rh) 
E) (104Cd) 
A) (103Ag) 
B) (101Rh) 
C) (107Ag) 
D) (103Rh) 
E) (104Cd)

Question 10

Which of the following nuclides will produce 192Pt upon undergoing beta decay?

Accepted Answer

A) (192Ir) 
B) (193Pt) 
C) (192Au) 
D) (196Hg) 
E) (188Os) 
A) (192Ir) 
B) (193Pt) 
C) (192Au) 
D) (196Hg) 
E) (188Os)

Question 11

Which of the following nuclides will produce 233Pa upon undergoing alpha decay?

Accepted Answer

A) (234Pa) 
B) (233U) 
C) (229Ra) 
D) (237Np) 
E) (233Th) 
A) (234Pa) 
B) (233U) 
C) (229Ra) 
D) (237Np) 
E) (233Th)

Question 12

When a neutron in the nucleus is converted to a proton,which of the following is emitted?

Accepted Answer

A) positron 
B) beta particle 
C) alpha particle 
D) deuteron 
E) neutron 
A) positron 
B) beta particle 
C) alpha particle 
D) deuteron 
E) neutron

Question 13

When 235U collides with one neutron,fission occurs.What is one possible set of products?

Accepted Answer

A) four neutrons,90Sr,and 140Xe 
B) four neutrons,90Sr,and 139Xe 
C) four neutrons,90Sr,and 139Ce 
D) four neutrons,90Sr,and 141Xe 
E) four neutrons,90Sr,and 142Xe 
A) four neutrons,90Sr,and 140Xe 
B) four neutrons,90Sr,and 139Xe 
C) four neutrons,90Sr,and 139Ce 
D) four neutrons,90Sr,and 141Xe 
E) four neutrons,90Sr,and 142Xe

Question 14

Which of the following statements about 248Bk is incorrect?

Accepted Answer

A) If 248Bk were to undergo spontaneous fission,the products would be 247Bk and a neutron. 
B) If 248Bk were to undergo beta decay,the products would be 248Cf and a beta particle. 
C) If 248Bk were to undergo alpha decay,the products would be 244Am and an alpha particle. 
D) If 248Bk were to undergo electron capture,the only product would be 248Cm. 
E) If a metastable form of 248Bk were to undergo gamma decay,the products would be 248Bk and a gamma ray. 
A) If 248Bk were to undergo spontaneous fission,the products would be 247Bk and a neutron. 
B) If 248Bk were to undergo beta decay,the products would be 248Cf and a beta particle. 
C) If 248Bk were to undergo alpha decay,the products would be 244Am and an alpha particle. 
D) If 248Bk were to undergo electron capture,the only product would be 248Cm. 
E) If a metastable form of 248Bk were to undergo gamma decay,the products would be 248Bk and a gamma ray.

Question 15

Iodine-131,which is used to treat thyroid cancer,has a half-life of 8.04 days.How much time is required for 68% of the isotope to decay?

Accepted Answer

A) 13 days 
B) 7 days 
C) 43 days 
D) 53 days 
E) 4 days 
A) 13 days 
B) 7 days 
C) 43 days 
D) 53 days 
E) 4 days

Question 16

Consider a certain type of nucleus that has a rate constant of 2.43 × 10-2 min-1.Calculate the time required for the sample to decay to one-fourth of its initial value.

Accepted Answer

A) 28.5 min 
B) 35.6 min 
C) 0.0486 min 
D) 57.0 min 
E) 2.43 min 
A) 28.5 min 
B) 35.6 min 
C) 0.0486 min 
D) 57.0 min 
E) 2.43 min

Question 17

The nuclide   is radioactive.When one of these atoms decays,a series of α and β- particle emissions occurs,taking the atom through many transformations to end up as an atom of  
)How many α particles are emitted in converting  
Into  
?

Accepted Answer

A) 6 
B) 2 
C) 214 
D) 8 
E) 4 
A) 6 
B) 2 
C) 214 
D) 8 
E) 4

Question 18

Metastable isotopes,such as Technetium-99m and those produced from neutron activation analysis decay by what process?

Accepted Answer

A) gamma emission 
B) alpha emission 
C) beta emission 
D) positron emission 
E) all of the above 
A) gamma emission 
B) alpha emission 
C) beta emission 
D) positron emission 
E) all of the above

Question 19

The gamma ray emission from the decay of cobalt-60 is used in cancer therapies.Cobalt-60 decays by the emission of two gamma rays followed by beta emission.What is the final product of this decay process?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 20

Which of these is not a transuranium element?

Accepted Answer

A) plutonium 
B) neptunium 
C) curium 
D) thorium 
E) americium 
A) plutonium 
B) neptunium 
C) curium 
D) thorium 
E) americium

Exam 20: Nuclear Chemistry

Relative to the sum of the masses of its constituent nucleons (neutrons + protons),the mass of a nucleus is

A sample of wood from an Egyptian mummy case gives a count of 8.5 cpm/gC (counts per minute per gram of carbon).How old is the wood? (The initial decay rate of Is 15.3 cpm/g C,and its half-life is 5730 years.)

Which of the following statements is(are)true for the fission of uranium-235?

Which of the following particles cannot be accelerated to high speeds in a particle accelerator or cyclotron?

What is the decay constant for a particular radioactive element that has a half-life of 5.66 years?

Which of the following is the most likely mode of decay for the radioactive nuclide ?

The isotope 210Pb has a half-life of 22 years.What percentage of a pure 210Pb sample prepared in April 1937 remains in April 1994?

What assumption must be true for radiocarbon (14C)dating to be useful?

When 103Pd undergoes electron capture,what is the product nuclide?

Which of the following nuclides will produce 192Pt upon undergoing beta decay?

Which of the following nuclides will produce 233Pa upon undergoing alpha decay?

When a neutron in the nucleus is converted to a proton,which of the following is emitted?

When 235U collides with one neutron,fission occurs.What is one possible set of products?

Which of the following statements about 248Bk is incorrect?

Iodine-131,which is used to treat thyroid cancer,has a half-life of 8.04 days.How much time is required for 68% of the isotope to decay?

Consider a certain type of nucleus that has a rate constant of 2.43 × 10-2 min-1.Calculate the time required for the sample to decay to one-fourth of its initial value.

The nuclide is radioactive.When one of these atoms decays,a series of α and β- particle emissions occurs,taking the atom through many transformations to end up as an atom of )How many α particles are emitted in converting Into ?

Metastable isotopes,such as Technetium-99m and those produced from neutron activation analysis decay by what process?

The gamma ray emission from the decay of cobalt-60 is used in cancer therapies.Cobalt-60 decays by the emission of two gamma rays followed by beta emission.What is the final product of this decay process?

Which of these is not a transuranium element?

Chemistry and Measurement

Atoms, molecules, and Ions

Calculations With Chemical Formulas and Equations

Chemical Reactions

The Gaseous State

Thermochemistry

Quantum Theory of the Atom

Electron Configurations and Periodicity

Ionic and Covalent Bonding

Molecular Geometry and Chemical Bonding Theory

States of Matter; Liquids and Solids

Solutions

Rates of Reaction

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Thermodynamics and Equilibrium

Electrochemistry

Chemistry of the Main-Group Metals

The Transition Elements and Coordination Compounds

Organic Chemistry

Polymer Materials: Synthetic and Biological

Filters

The isotope ²¹⁰Pb has a half-life of 22 years.What percentage of a pure ²¹⁰Pb sample prepared in April 1937 remains in April 1994?

What assumption must be true for radiocarbon (¹⁴C)dating to be useful?

When ¹⁰³Pd undergoes electron capture,what is the product nuclide?

Which of the following nuclides will produce ¹⁹²Pt upon undergoing beta decay?

Which of the following nuclides will produce ²³³Pa upon undergoing alpha decay?

When ²³⁵U collides with one neutron,fission occurs.What is one possible set of products?

Which of the following statements about ²⁴⁸Bk is incorrect?

Consider a certain type of nucleus that has a rate constant of 2.43 × 10^-2 min^-1.Calculate the time required for the sample to decay to one-fourth of its initial value.

The nuclide is radioactive.When one of these atoms decays,a series of α and β^- particle emissions occurs,taking the atom through many transformations to end up as an atom of )How many α particles are emitted in converting Into ?