Question 1

The mass change for the reaction shown below is ________ amu.The atomic masses are 3He (3.0160),4He (4.0026),1H (1.0078).
2   He →   He + 2   H

Accepted Answer

Question 2

Units used for measuring radiation include the becquerel,the curie,the gray,and the sievert,which have the abbreviations ________,________,________,and ________,respectively.

Accepted Answer

The answer of Units used for measuring radiation include the...

Question 3

Which of the following elements would you expect to have the largest number of stable isotopes? Element number:

Accepted Answer

A) 48 
B) 49 
C) 50 
D) 51 
A) 48 
B) 49 
C) 50 
D) 51

Question 4

Helium-3,an electron,a neutron,and a proton have masses of 3.016029 amu,5.486 × 10-4 amu,1.00866 amu,and 1.00728 amu,respectively.The mass defect for the formation of helium-3 is ________ amu or ________ g/mol.

Accepted Answer

Question 5

Which of the following isotopes is the least stable?

Accepted Answer

A) .7Be,5.37 MeV/nucleon 
B) .23Na,8.11 MeV/nucleon 
C) .94Zr,8.67 MeV/nucleon 
D) .240Pu,7.26 MeV/nucleon 
A) .7Be,5.37 MeV/nucleon 
B) .23Na,8.11 MeV/nucleon 
C) .94Zr,8.67 MeV/nucleon 
D) .240Pu,7.26 MeV/nucleon

Question 6

Fluorine-18 is a radioisotope widely used in positron emission tomography to investigate brain activity.The half-life is 109.8 minutes.How long will it take for 2.75 μg of 18F to decay to 500 ng?

Accepted Answer

A) 0.288 min 
B) 270 min 
C) 871 min 
D) 2.06 × 103 min 
A) 0.288 min 
B) 270 min 
C) 871 min 
D) 2.06 × 103 min

Question 7

Tritium,   H,is formed in the upper atmosphere when   N captures a neutron and then decays.What is the other product of this reaction?

Accepted Answer

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

Question 8

Which of the following statements regarding nuclear stability is true?

Accepted Answer

A) A stable element always has an equal number of protons and neutrons. 
B) The most abundant isotope of an element always has an equal number of protons and neutrons. 
C) Very few elements have at least one radioactive isotope. 
D) Hydrogen is the only element whose most abundant isotope contains more protons than neutrons. 
A) A stable element always has an equal number of protons and neutrons. 
B) The most abundant isotope of an element always has an equal number of protons and neutrons. 
C) Very few elements have at least one radioactive isotope. 
D) Hydrogen is the only element whose most abundant isotope contains more protons than neutrons.

Question 9

An element,   X is formed by bombardment of uranium-238 atoms with a beta particle.How many neutrons are produced by this reaction?

Accepted Answer

A) 3 
B) 2 
C) 1 
D) 0 
A) 3 
B) 2 
C) 1 
D) 0

Question 10

Among the types of radiation,α,β,γ,and X,the one that requires the least amount of protective clothing is ________ radiation.

Accepted Answer

The answer of Among the types of radiation,α,β,γ,and X,the one...

Question 11

An archeological artifact was subjected to radiocarbon dating.The artifact showed a carbon-14 decay rate of 13.8 disintegrations/min per gram of carbon.Carbon-14 has a half-life of 5715 years,and currently living organisms decay at the rate of 15.3 disintegrations/min per gram of carbon.What is the approximate age of the artifact?

Accepted Answer

A) 257 years old 
B) 371 years old 
C) 591 years old 
D) 851 years old 
A) 257 years old 
B) 371 years old 
C) 591 years old 
D) 851 years old

Question 12

Elements with ________ atomic mass are best possible candidates for a fusion reaction.

Accepted Answer

A) very low 
B) moderate 
C) moderate to heavy 
D) very heavy 
A) very low 
B) moderate 
C) moderate to heavy 
D) very heavy

Question 13

What mass percent of 235U (the fissionable isotope)is used in the fuel in nuclear power plants?

Accepted Answer

A) 3% 
B) 14% 
C) 30% 
D) 85% 
A) 3% 
B) 14% 
C) 30% 
D) 85%

Question 14

The binding energy for lithium-7 nuclei is 3.79 × 1012 J/mol.The binding energy per nucleon for lithium-7 nuclei is ________ MeV/nucleon.

Accepted Answer

Question 15

The total binding energies for 3He,4He,and 6He are 7.72 MeV,28.29 MeV,and 29.26 MeV respectively.Arrange the 3 isotopes in increasing order of binding energy per nucleon.

Accepted Answer

A) .3He 4He 6He 
B) .6He 4He 3He 
C) .4He 3He 6He 
D) .3He 6He 4He 
A) .3He 4He 6He 
B) .6He 4He 3He 
C) .4He 3He 6He 
D) .3He 6He 4He

Question 16

If a sample of 233Pa takes 62.7 days to decrease to 20.0% of its original mass,what is its half-life?

Accepted Answer

A) 0.0370 days 
B) 27.0 days 
C) 157 days 
D) 195 days 
A) 0.0370 days 
B) 27.0 days 
C) 157 days 
D) 195 days

Question 17

What is the missing product of the nuclear reaction?   Bi +   p → ? +   Po

Accepted Answer

A) α 
B) β+ 
C) β- 
D) n 
A) α 
B) β+ 
C) β- 
D) n

Question 18

Human bones found on the west coast of the United States were thought to be remains of a prospector who lived in the 19th century.The bones were subjected to carbon-14 dating.Carbon-14 has a half-life of 5715 years.Living organisms decay at a rate of 15.30 disintegrations per minute per gram of carbon.The bones had a carbon-14 decay rate of 4.660 disintegrations per minute per gram of carbon.To one significant figure the age of the bones is ________ years old,so the person ________ (did,did not)live in the 19th century.

Accepted Answer

Question 19

Which of the following figures represents the decay of   K by positron emission to give   Ar after three half-lives has passed? Unshaded spheres represent   K atoms and shaded spheres represent   Ar atoms.

Accepted Answer

A) figure (1) 
B) figure (2) 
C) figure (3) 
D) figure (4) 
A) figure (1) 
B) figure (2) 
C) figure (3) 
D) figure (4)

Question 20

Which one of the following statements about isotopes is false?

Accepted Answer

A) The ratio of neutrons to protons is about 1:1 for elements lighter than Ca. 
B) The ratio of neutrons to protons is > 1:1 for elements heavier than Ca. 
C) Nonradioactive isotopes generally have an odd number of neutrons. 
D) All isotopes beyond 209Bi are radioactive. 
A) The ratio of neutrons to protons is about 1:1 for elements lighter than Ca. 
B) The ratio of neutrons to protons is > 1:1 for elements heavier than Ca. 
C) Nonradioactive isotopes generally have an odd number of neutrons. 
D) All isotopes beyond 209Bi are radioactive.

Exam 19: Nuclear Chemistry

The mass change for the reaction shown below is ________ amu.The atomic masses are 3He (3.0160),4He (4.0026),1H (1.0078). 2 He → He + 2 H

Units used for measuring radiation include the becquerel,the curie,the gray,and the sievert,which have the abbreviations ________,________,________,and ________,respectively.

Which of the following elements would you expect to have the largest number of stable isotopes? Element number:

Helium-3,an electron,a neutron,and a proton have masses of 3.016029 amu,5.486 × 10-4 amu,1.00866 amu,and 1.00728 amu,respectively.The mass defect for the formation of helium-3 is ________ amu or ________ g/mol.

Which of the following isotopes is the least stable?

Fluorine-18 is a radioisotope widely used in positron emission tomography to investigate brain activity.The half-life is 109.8 minutes.How long will it take for 2.75 μg of 18F to decay to 500 ng?

Tritium, H,is formed in the upper atmosphere when N captures a neutron and then decays.What is the other product of this reaction?

Which of the following statements regarding nuclear stability is true?

An element, X is formed by bombardment of uranium-238 atoms with a beta particle.How many neutrons are produced by this reaction?

Among the types of radiation,α,β,γ,and X,the one that requires the least amount of protective clothing is ________ radiation.

Elements with ________ atomic mass are best possible candidates for a fusion reaction.

What mass percent of 235U (the fissionable isotope)is used in the fuel in nuclear power plants?

The binding energy for lithium-7 nuclei is 3.79 × 1012 J/mol.The binding energy per nucleon for lithium-7 nuclei is ________ MeV/nucleon.

The total binding energies for 3He,4He,and 6He are 7.72 MeV,28.29 MeV,and 29.26 MeV respectively.Arrange the 3 isotopes in increasing order of binding energy per nucleon.

If a sample of 233Pa takes 62.7 days to decrease to 20.0% of its original mass,what is its half-life?

What is the missing product of the nuclear reaction? Bi + p → ? + Po

Which of the following figures represents the decay of K by positron emission to give Ar after three half-lives has passed? Unshaded spheres represent K atoms and shaded spheres represent Ar atoms.

Which one of the following statements about isotopes is false?

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The mass change for the reaction shown below is ________ amu.The atomic masses are ³He (3.0160),⁴He (4.0026),¹H (1.0078). 2 He → He + 2 H

Units used for measuring radiation include the becquerel,the curie,the gray,and the sievert,which have the abbreviations ,,,and ,respectively.

Helium-3,an electron,a neutron,and a proton have masses of 3.016029 amu,5.486 × 10^-4 amu,1.00866 amu,and 1.00728 amu,respectively.The mass defect for the formation of helium-3 is amu or g/mol.

Fluorine-18 is a radioisotope widely used in positron emission tomography to investigate brain activity.The half-life is 109.8 minutes.How long will it take for 2.75 μg of ¹⁸F to decay to 500 ng?

What mass percent of ²³⁵U (the fissionable isotope)is used in the fuel in nuclear power plants?

The binding energy for lithium-7 nuclei is 3.79 × 10¹² J/mol.The binding energy per nucleon for lithium-7 nuclei is ________ MeV/nucleon.

The total binding energies for ³He,⁴He,and ⁶He are 7.72 MeV,28.29 MeV,and 29.26 MeV respectively.Arrange the 3 isotopes in increasing order of binding energy per nucleon.

If a sample of ²³³Pa takes 62.7 days to decrease to 20.0% of its original mass,what is its half-life?