Question 1

Which of the following nuclides are most likely to decay via positron emission?

Accepted Answer

A) Na-26 
B) I-121 
C) Ca-42 
D) S-30 
E) Sb-122 
A) Na-26 
B) I-121 
C) Ca-42 
D) S-30 
E) Sb-122

Question 2

The following reaction represents what nuclear process?   Cs +   e →   Xe

Accepted Answer

A) beta emission 
B) positron emission 
C) gamma emission 
D) electron capture 
E) alpha capture 
A) beta emission 
B) positron emission 
C) gamma emission 
D) electron capture 
E) alpha capture

Question 3

Write the nuclear equation for the alpha decay of   Ra.

Accepted Answer

A)    Ra +   He →   Th 
B)    Ra →   n +   Ra 
C)    Ra →   e +   Ac 
D)    Ra +   e →   Ac 
E)    Ra →   He +   Rn 
A)    Ra +   He →   Th 
B)    Ra →   n +   Ra 
C)    Ra →   e +   Ac 
D)    Ra +   e →   Ac 
E)    Ra →   He +   Rn

Question 4

The age of an ancient tree trunk is estimated using radiocarbon dating. If the trunk has a C-14 decay rate that is 34% of what it is in living plants, how old is the trunk? The half-life of C-14 is 5730 years.

Accepted Answer

A) 2.92 × 104 years 
B) 1.94 × 104 years 
C) 8.92 × 103 years 
D) 5.31 × 103 years 
E) 1.74 × 102 years 
A) 2.92 × 104 years 
B) 1.94 × 104 years 
C) 8.92 × 103 years 
D) 5.31 × 103 years 
E) 1.74 × 102 years

Question 5

Beta decay of 60Co produces a beta particle and

Accepted Answer

A) (56Mn) 
B) (59Co) 
C) (60Fe) 
D) (60Ni) 
A) (56Mn) 
B) (59Co) 
C) (60Fe) 
D) (60Ni)

Question 6

gamma ray
Match the following.

Accepted Answer

A)    e 
B)    He 
C)    e 
D)    $\gamma$ 
E)    p
F)   n 
A)    e 
B)    He 
C)    e 
D)    $\gamma$ 
E)    p
F)   n

Question 7

Strontium-90 is a byproduct in nuclear reactors fuelled by the radioisotope uranium-235. The half-life of strontium-90 is 28.8 y. What percentage of a strontium-90 sample remains after 75.0 y.?

Accepted Answer

A) 68.1 
B) 16.4 
C) 7.40 
D) 38.4 
E) 2.60 
A) 68.1 
B) 16.4 
C) 7.40 
D) 38.4 
E) 2.60

Question 8

Determine the identity of the daughter nuclide from the positron emission of   Ge.

Accepted Answer

A)    Ga 
B)    As 
C)    Zn 
D)    As 
E)    Ga 
A)    Ga 
B)    As 
C)    Zn 
D)    As 
E)    Ga

Question 9

What percentage of a radioactive substance remains after 7.00 half-lives have elapsed?

Accepted Answer

A) 0.391% 
B) 0.78% 
C) 1.56% 
D) 3.12% 
A) 0.391% 
B) 0.78% 
C) 1.56% 
D) 3.12%

Question 10

Neptunium-239 has a half-life of 2.35 days. How many days must elapse for a sample of 239Np to decay to 0.100% of its original quantity?

Accepted Answer

A) 0.0427 days 
B) 1.491 days 
C) 2.04 days 
D) 23.4 days 
A) 0.0427 days 
B) 1.491 days 
C) 2.04 days 
D) 23.4 days

Question 11

A rock contains 0.313 mg of lead-206 for each milligram of uranium-238. The half-life for the decay of uranium-238 to lead-206 is 4.5 × 109 y. The rock was formed ________ y. ago.

Accepted Answer

A) 1.41 × 109 
B) 1.08 × 109 
C) 1.39 × 109 
D) 2.00 × 109 
E) 1.56 × 109 
A) 1.41 × 109 
B) 1.08 × 109 
C) 1.39 × 109 
D) 2.00 × 109 
E) 1.56 × 109

Question 12

What is the unit for the measure of an absorbed dose of radiation and what is its SI definition?

Accepted Answer

A) watt, 1W = 1 J/1 sec 
B) joule, 1 J = (mv2)/2 
C) becquerel, 1 Bq = (number of decay events)/time 
D) sievert, 1 Sv = 1 J/(kg of body tissue) 
E) gray, 1 Gy = 1 J/(kg of body tissue) 
A) watt, 1W = 1 J/1 sec 
B) joule, 1 J = (mv2)/2 
C) becquerel, 1 Bq = (number of decay events)/time 
D) sievert, 1 Sv = 1 J/(kg of body tissue) 
E) gray, 1 Gy = 1 J/(kg of body tissue)

Question 13

The combination of two light nuclei to form a heavier nuclei is called ________.

Accepted Answer

A) radioactive cleavage 
B) nuclear fission 
C) nuclear fusion 
D) radioactive merge 
E) the half-life 
A) radioactive cleavage 
B) nuclear fission 
C) nuclear fusion 
D) radioactive merge 
E) the half-life

Question 14

Describe what is meant by the "valley of stability."

Accepted Answer

If a plot of number of neutrons vs. numb

Question 15

Calculate the mass defect in Ni-59 if the mass of a Ni-59 nucleus is 58.69344 amu. The mass of a proton is 1.00728 amu and the mass of a neutron is 1.008665 amu.

Accepted Answer

A) 0.23212 amu 
B) 0.77902 amu 
C) 0.23041 amu 
D) 0.77589 amu 
E) 0.22198 amu 
A) 0.23212 amu 
B) 0.77902 amu 
C) 0.23041 amu 
D) 0.77589 amu 
E) 0.22198 amu

Which of the following nuclides are most likely to decay via positron emission?

The following reaction represents what nuclear process? Cs + e → Xe

Write the nuclear equation for the alpha decay of Ra.

The age of an ancient tree trunk is estimated using radiocarbon dating. If the trunk has a C-14 decay rate that is 34% of what it is in living plants, how old is the trunk? The half-life of C-14 is 5730 years.

Beta decay of ⁶⁰Co produces a beta particle and

gamma ray Match the following.

Strontium-90 is a byproduct in nuclear reactors fuelled by the radioisotope uranium-235. The half-life of strontium-90 is 28.8 y. What percentage of a strontium-90 sample remains after 75.0 y.?

Determine the identity of the daughter nuclide from the positron emission of Ge.

What percentage of a radioactive substance remains after 7.00 half-lives have elapsed?

Neptunium-239 has a half-life of 2.35 days. How many days must elapse for a sample of ²³⁹Np to decay to 0.100% of its original quantity?

A rock contains 0.313 mg of lead-206 for each milligram of uranium-238. The half-life for the decay of uranium-238 to lead-206 is 4.5 × 10⁹ y. The rock was formed ________ y. ago.

What is the unit for the measure of an absorbed dose of radiation and what is its SI definition?

The combination of two light nuclei to form a heavier nuclei is called ________.

Describe what is meant by the "valley of stability."

Calculate the mass defect in Ni-59 if the mass of a Ni-59 nucleus is 58.69344 amu. The mass of a proton is 1.00728 amu and the mass of a neutron is 1.008665 amu.

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Molecules, Compounds, and Nomenclature

Chemical Reactions and Stoichiometry

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding Ii: Molecular Shapes, Valence Bond Theory, and Molecular Orbital Theory

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Organic Chemistry I: Structures

Organic Chemistry II: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallury

Transition Metals and Coordination Compounds

Filters

Exam 19: Radioactivity and Nuclear Chemistry

Which of the following nuclides are most likely to decay via positron emission?

The following reaction represents what nuclear process? Cs + e → Xe

Write the nuclear equation for the alpha decay of Ra.

The age of an ancient tree trunk is estimated using radiocarbon dating. If the trunk has a C-14 decay rate that is 34% of what it is in living plants, how old is the trunk? The half-life of C-14 is 5730 years.

Beta decay of 60Co produces a beta particle and

gamma ray Match the following.

Strontium-90 is a byproduct in nuclear reactors fuelled by the radioisotope uranium-235. The half-life of strontium-90 is 28.8 y. What percentage of a strontium-90 sample remains after 75.0 y.?

Determine the identity of the daughter nuclide from the positron emission of Ge.

What percentage of a radioactive substance remains after 7.00 half-lives have elapsed?

Neptunium-239 has a half-life of 2.35 days. How many days must elapse for a sample of 239Np to decay to 0.100% of its original quantity?

A rock contains 0.313 mg of lead-206 for each milligram of uranium-238. The half-life for the decay of uranium-238 to lead-206 is 4.5 × 109 y. The rock was formed ________ y. ago.

What is the unit for the measure of an absorbed dose of radiation and what is its SI definition?

The combination of two light nuclei to form a heavier nuclei is called ________.

Describe what is meant by the "valley of stability."

Calculate the mass defect in Ni-59 if the mass of a Ni-59 nucleus is 58.69344 amu. The mass of a proton is 1.00728 amu and the mass of a neutron is 1.008665 amu.

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Molecules, Compounds, and Nomenclature

Chemical Reactions and Stoichiometry

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding Ii: Molecular Shapes, Valence Bond Theory, and Molecular Orbital Theory

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Organic Chemistry I: Structures

Organic Chemistry II: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallury

Transition Metals and Coordination Compounds

Filters

Beta decay of ⁶⁰Co produces a beta particle and

Neptunium-239 has a half-life of 2.35 days. How many days must elapse for a sample of ²³⁹Np to decay to 0.100% of its original quantity?

A rock contains 0.313 mg of lead-206 for each milligram of uranium-238. The half-life for the decay of uranium-238 to lead-206 is 4.5 × 10⁹ y. The rock was formed ________ y. ago.