Question 1

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

Accepted Answer

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

Question 2

In the radioactive decay series of plutonium-244 to form lead-208,how many alpha particles and how many beta particles are emitted per plutonium atom?

Accepted Answer

A) 6 alpha particles and 6 beta particles 
B) 3 alpha particles and 3 beta particles 
C) 9 alpha particles and 6 beta particles 
D) 12 alpha particles and 8 beta particles 
E) 18 alpha particles and 9 beta particles 
A) 6 alpha particles and 6 beta particles 
B) 3 alpha particles and 3 beta particles 
C) 9 alpha particles and 6 beta particles 
D) 12 alpha particles and 8 beta particles 
E) 18 alpha particles and 9 beta particles C

Question 3

When 25Na undergoes beta emission,what is the product nuclide?

Accepted Answer

A) (25Ne) 
B) (24Mg) 
C) (24Na) 
D) (24Ne) 
E) (25Mg) 
A) (25Ne) 
B) (24Mg) 
C) (24Na) 
D) (24Ne) 
E) (25Mg) E

Question 4

Which of the following nuclides has the highest nuclear binding energy per nucleon?

Accepted Answer

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

Question 5

A nucleus located to the left of the band of stability is expected to undergo what type of nuclear decay?

Accepted Answer

A) alpha emission 
B) electron capture 
C) positron emission 
D) fission 
E) electron emission 
A) alpha emission 
B) electron capture 
C) positron emission 
D) fission 
E) electron emission

Question 6

Which particle has the same mass as a beta particle?

Accepted Answer

A) a neutron 
B) a proton 
C) a gamma ray 
D) an alpha particle 
E) a positron 
A) a neutron 
B) a proton 
C) a gamma ray 
D) an alpha particle 
E) a positron

Question 7

A radioactive isotope decays by α emission followed by two β emissions.What is the change in the mass number and atomic number of the original isotope?

Accepted Answer

A) The mass number decreases by 4 and the atomic number is unchanged. 
B) The mass number increases by 4 and the atomic number increases by 2. 
C) The mass number increases by 4 and the atomic number increases by 4. 
D) The mass number decreases by 2 and the atomic number decreases by 2. 
E) none of the above 
A) The mass number decreases by 4 and the atomic number is unchanged. 
B) The mass number increases by 4 and the atomic number increases by 2. 
C) The mass number increases by 4 and the atomic number increases by 4. 
D) The mass number decreases by 2 and the atomic number decreases by 2. 
E) none of the above

Question 8

The half-life of the radioactive nuclide   is 9.0 min.What is the activity of a 4.7-µg sample of  
? The molar mass of  
Is 78.921 g/mol.(1 Ci = 3.700 × 1010 disintegrations/s)

Accepted Answer

A) ​1.8×103Ci 
B) ​1.1×105Ci 
C) ​1.2×103Ci 
D) ​7.5×104Ci 
E) ​1.1×10-10Ci 
A) ​1.8×103Ci 
B) ​1.1×105Ci 
C) ​1.2×103Ci 
D) ​7.5×104Ci 
E) ​1.1×10-10Ci

Question 9

The activity of a radioactive source

Accepted Answer

A) is a measure of the number of nuclear disintegrations per second. 
B) may be quantified in units of curies (Ci). 
C) is a measure of the energy released per kilogram of tissue. 
D) A and B 
E) B and C 
A) is a measure of the number of nuclear disintegrations per second. 
B) may be quantified in units of curies (Ci). 
C) is a measure of the energy released per kilogram of tissue. 
D) A and B 
E) B and C

Question 10

Which of the following nuclides will produce 243Am upon undergoing alpha decay?

Accepted Answer

A) (247Bk) 
B) (239Np) 
C) (243Pu) 
D) (243Cm) 
E) (244Am) 
A) (247Bk) 
B) (239Np) 
C) (243Pu) 
D) (243Cm) 
E) (244Am)

Question 11

When   absorbs a neutron,fission occurs.One possible fission pathway is as follows:  
What is the missing isotope?

Accepted Answer

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

Question 12

Use the following table to assist in answering the question below.
Nuclide
Half-Life
Uranium-238
4)51 × 109 years
Uranium-234
2)48 × 105 years
Thorium-230
8)0 × 104 years
Radium-226
1)62 × 103 years
Lead-210
20)4 years
The rate constant for the decay of unstable nuclide X by alpha-particle emission is 1.17 × 10-6 / day.What is the identity of X?

Accepted Answer

A) radium-226 
B) thorium-230 
C) uranium-238 
D) uranium-234 
E) lead-210 
A) radium-226 
B) thorium-230 
C) uranium-238 
D) uranium-234 
E) lead-210

Question 13

A living tree contains 14C (half-life,5730 years)and has a specific activity of 750 counts per hour.A wooden artifact recovered from an archeological site gives a count of 210 counts per hour.The age of this artifact is most nearly

Accepted Answer

A) 47,000 years. 
B) 4,500 years. 
C) 10,000 years. 
D) 22,000 years. 
E) 5730 years. 
A) 47,000 years. 
B) 4,500 years. 
C) 10,000 years. 
D) 22,000 years. 
E) 5730 years.

Question 14

If a tree dies and the trunk remains undisturbed for 14560 years,what percentage of original   is still present? (half-life of  
= 5730 years)

Accepted Answer

A) 34.0% 
B) 25.0% 
C) 82.0% 
D) 17.0% 
A) 34.0% 
B) 25.0% 
C) 82.0% 
D) 17.0%

Question 15

How much energy is released when 2.00 metric tons of 2H2 gas undergoes nuclear fusion? (1 metric ton = 1000 kg,c = 3.00 × 108 m/s,1 amu = 1.66054 × 10-27 kg)
2H + 2H → 3He + 1n
Particle
Mass (amu)  
​
1)008665  
​
2)01400  
​
3)01603
​

Accepted Answer

A) ​6.77×10-18J 
B) ​1.48×1017J 
C) ​1.07×1017J 
D) ​5.39×1010J 
E) ​2.95×1017J 
A) ​6.77×10-18J 
B) ​1.48×1017J 
C) ​1.07×1017J 
D) ​5.39×1010J 
E) ​2.95×1017J

Question 16

Which of the following corresponds to the most rapid nuclear decay?

Accepted Answer

A) t1/2 = 1.0 × 103 min 
B) t1/2 = 1.0 × 109 year 
C) k = 1.0 × 10-3/year 
D) k = 1.0 × 10-1/day 
E) k = 1.0 × 10-5/s 
A) t1/2 = 1.0 × 103 min 
B) t1/2 = 1.0 × 109 year 
C) k = 1.0 × 10-3/year 
D) k = 1.0 × 10-1/day 
E) k = 1.0 × 10-5/s

Question 17

The commonly used radioactive isotopes radium-226,radon-222,and cobalt-60 are used in _____.

Accepted Answer

A) ​palliative therapy 
B) ​drug therapy 
C) ​electromagnetic therapy 
D) ​cancer therapy 
E) ​helminthic therapy 
A) ​palliative therapy 
B) ​drug therapy 
C) ​electromagnetic therapy 
D) ​cancer therapy 
E) ​helminthic therapy

Question 18

If 1 mol of oxygen-16 were formed from protons and neutrons,0.1366 g of mass would be lost.What can best account for this loss?

Accepted Answer

A) Converting from the atomic scale (in atomic mass units)to the macroscopic scale (in grams)can often cause minor errors to occur. 
B) The process was so exothermic that the system lost energy,which means that it also lost mass. 
C) This is impossible because of the law of conservation of matter (so mass must be conserved). 
D) When fission occurs,the nuclei remaining always have a smaller mass. 
E) Both a and c are correct. 
A) Converting from the atomic scale (in atomic mass units)to the macroscopic scale (in grams)can often cause minor errors to occur. 
B) The process was so exothermic that the system lost energy,which means that it also lost mass. 
C) This is impossible because of the law of conservation of matter (so mass must be conserved). 
D) When fission occurs,the nuclei remaining always have a smaller mass. 
E) Both a and c are correct.

Question 19

The half-life of phosphorus-33 is 25 days.How much of a 128-g sample will remain after 160 days?

Accepted Answer

A) 1.5 g 
B) 16 g 
C) 1.0 g 
D) 8.0 g 
E) 4.0 g 
A) 1.5 g 
B) 16 g 
C) 1.0 g 
D) 8.0 g 
E) 4.0 g

Question 20

When the radioactive nuclide 198Po undergoes alpha emission,what is the product nuclide?

Accepted Answer

A) (196Pb) 
B) (202Rn) 
C) (196At) 
D) (194Pb) 
E) (198Rn) 
A) (196Pb) 
B) (202Rn) 
C) (196At) 
D) (194Pb) 
E) (198Rn)

Exam 20: Nuclear Chemistry

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

In the radioactive decay series of plutonium-244 to form lead-208,how many alpha particles and how many beta particles are emitted per plutonium atom?

When 25Na undergoes beta emission,what is the product nuclide?

Which of the following nuclides has the highest nuclear binding energy per nucleon?

A nucleus located to the left of the band of stability is expected to undergo what type of nuclear decay?

Which particle has the same mass as a beta particle?

A radioactive isotope decays by α emission followed by two β emissions.What is the change in the mass number and atomic number of the original isotope?

The half-life of the radioactive nuclide is 9.0 min.What is the activity of a 4.7-µg sample of ? The molar mass of Is 78.921 g/mol.(1 Ci = 3.700 × 1010 disintegrations/s)

The activity of a radioactive source

Which of the following nuclides will produce 243Am upon undergoing alpha decay?

When absorbs a neutron,fission occurs.One possible fission pathway is as follows: What is the missing isotope?

A living tree contains 14C (half-life,5730 years)and has a specific activity of 750 counts per hour.A wooden artifact recovered from an archeological site gives a count of 210 counts per hour.The age of this artifact is most nearly

If a tree dies and the trunk remains undisturbed for 14560 years,what percentage of original is still present? (half-life of = 5730 years)

How much energy is released when 2.00 metric tons of 2H2 gas undergoes nuclear fusion? (1 metric ton = 1000 kg,c = 3.00 × 108 m/s,1 amu = 1.66054 × 10-27 kg) 2H + 2H → 3He + 1n Particle Mass (amu) ​ 1)008665 ​ 2)01400 ​ 3)01603 ​

Which of the following corresponds to the most rapid nuclear decay?

The commonly used radioactive isotopes radium-226,radon-222,and cobalt-60 are used in _____.

If 1 mol of oxygen-16 were formed from protons and neutrons,0.1366 g of mass would be lost.What can best account for this loss?

The half-life of phosphorus-33 is 25 days.How much of a 128-g sample will remain after 160 days?

When the radioactive nuclide 198Po undergoes alpha emission,what is the product nuclide?

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

When ²⁵Na undergoes beta emission,what is the product nuclide?

The half-life of the radioactive nuclide is 9.0 min.What is the activity of a 4.7-µg sample of ? The molar mass of Is 78.921 g/mol.(1 Ci = 3.700 × 10¹⁰ disintegrations/s)

Which of the following nuclides will produce ²⁴³Am upon undergoing alpha decay?

A living tree contains ¹⁴C (half-life,5730 years)and has a specific activity of 750 counts per hour.A wooden artifact recovered from an archeological site gives a count of 210 counts per hour.The age of this artifact is most nearly

How much energy is released when 2.00 metric tons of ²H₂ gas undergoes nuclear fusion? (1 metric ton = 1000 kg,c = 3.00 × 10⁸ m/s,1 amu = 1.66054 × 10^-27 kg) ²H + ²H → ³He + ¹n Particle Mass (amu) 1)008665 2)01400 3)01603

When the radioactive nuclide ¹⁹⁸Po undergoes alpha emission,what is the product nuclide?