Question 1

Neptunium-239 has a half-life of 2.35 days.How many days must elapse for a sample of 239Np to decay to 1.00% of its original quantity?

Accepted Answer

A)  0.0640 days 
B)  0.736 days 
C)  1.36 days 
D)  15.6 days 
A)  0.0640 days 
B)  0.736 days 
C)  1.36 days 
D)  15.6 days

Question 2

Describe what changes occur during positron emission.

Accepted Answer

A)  The mass number and atomic number decreases. 
B)  The mass number and atomic number increases. 
C)  The mass number is unchanged and the atomic number decreases. 
D)  The mass number decreases and the atomic number increases. 
E)  The mass number and atomic number do not change. 
A)  The mass number and atomic number decreases. 
B)  The mass number and atomic number increases. 
C)  The mass number is unchanged and the atomic number decreases. 
D)  The mass number decreases and the atomic number increases. 
E)  The mass number and atomic number do not change.

Question 3

The following reaction represents what nuclear process?   U +   n →   Ba +   Kr + 3   n

Accepted Answer

A)  nuclear fission 
B)  nuclear fusion 
C)  electron capture 
D)  alpha decay 
E)  beta emission 
A)  nuclear fission 
B)  nuclear fusion 
C)  electron capture 
D)  alpha decay 
E)  beta emission

Question 4

Identify the part of the body that can be studied with radiotracers.

Accepted Answer

A)  spleen 
B)  brain 
C)  heart 
D)  tumors 
E)  all of the above 
A)  spleen 
B)  brain 
C)  heart 
D)  tumors 
E)  all of the above

Question 5

Determine the identity of the daughter nuclide from the alpha decay of   Po.

Accepted Answer

A)    Po 
B)    Hg 
C)    At 
D)    Pb 
E)    Rn 
A)    Po 
B)    Hg 
C)    At 
D)    Pb 
E)    Rn

Question 6

Complete the following equation of nuclear fusion.   H +   H →   He + ______

Accepted Answer

A)    e 
B)    g 
C)    n 
D)    n 
E)    n 
A)    e 
B)    g 
C)    n 
D)    n 
E)    n

Question 7

Describe what changes occur during gamma ray emission.

Accepted Answer

A)  The mass number and atomic number decreases. 
B)  The mass number and atomic number increases. 
C)  The mass number is unchanged and the atomic number decreases. 
D)  The mass number decreases and the atomic number is unchanged. 
E)  The mass number and atomic number do not change. 
A)  The mass number and atomic number decreases. 
B)  The mass number and atomic number increases. 
C)  The mass number is unchanged and the atomic number decreases. 
D)  The mass number decreases and the atomic number is unchanged. 
E)  The mass number and atomic number do not change.

Question 8

Determine the identity of the daughter nuclide from the electron capture by   Fe.

Accepted Answer

A)    Co 
B)    Mn 
C)    Co 
D)    Mn 
E)    Cr 
A)    Co 
B)    Mn 
C)    Co 
D)    Mn 
E)    Cr

Question 9

Write a nuclear equation for the alpha decay of   Am.

Accepted Answer

A)    Am →   He +   Np 
B)    Am →   He +   Bk 
C)    Am →   e +   Cm 
D)    Am →   e +   Pu 
E)    Am →   n +   Am 
A)    Am →   He +   Np 
B)    Am →   He +   Bk 
C)    Am →   e +   Cm 
D)    Am →   e +   Pu 
E)    Am →   n +   Am

Question 10

Determine the identity of the daughter nuclide from the beta decay of   Tc.

Accepted Answer

A)    Ru 
B)    Rh 
C)    Nb 
D)    Mo 
E)    Ru 
A)    Ru 
B)    Rh 
C)    Nb 
D)    Mo 
E)    Ru

Question 11

Which of the following elements would be expected to be particularly stable?

Accepted Answer

A)    O 
B)    N 
C)    C 
D)    B 
A)    O 
B)    N 
C)    C 
D)    B

Question 12

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 13

Define chain reaction in terms of the fission of uranium nucleus.

Accepted Answer

Neutrons,produced by

Question 14

Determine the identity of the daughter nuclide from the beta decay of   Pb.

Accepted Answer

A)    Pt 
B)    Tl 
C)    Hg 
D)    Bi 
E)    Pb 
A)    Pt 
B)    Tl 
C)    Hg 
D)    Bi 
E)    Pb

Question 15

Determine the identity of the daughter nuclide from the electron capture by   Cl.

Accepted Answer

A)    Ar 
B)    K 
C)    S 
D)    P 
E)    Ar 
A)    Ar 
B)    K 
C)    S 
D)    P 
E)    Ar

Question 16

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 17

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 18

What percentage of a radioactive substance remains after 3.00 half-lives have elapsed?

Accepted Answer

A)  6.25% 
B)  12.5% 
C)  25.0% 
D)  50.0% 
A)  6.25% 
B)  12.5% 
C)  25.0% 
D)  50.0%

Question 19

Write a nuclear equation to describe the neutron induced fission of   Pu to form   Kr and   Ce.Determine how many neutrons are produced in the reaction.

Accepted Answer

A)  2 
B)  0 
C)  3 
D)  1 
E)  4 
A)  2 
B)  0 
C)  3 
D)  1 
E)  4

Question 20

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

Accepted Answer

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

Exam 21: Radioactivity and Nuclear Chemistry

Neptunium-239 has a half-life of 2.35 days.How many days must elapse for a sample of 239Np to decay to 1.00% of its original quantity?

Describe what changes occur during positron emission.

The following reaction represents what nuclear process? U + n → Ba + Kr + 3 n

Identify the part of the body that can be studied with radiotracers.

Determine the identity of the daughter nuclide from the alpha decay of Po.

Complete the following equation of nuclear fusion. H + H → He + ______

Describe what changes occur during gamma ray emission.

Determine the identity of the daughter nuclide from the electron capture by Fe.

Write a nuclear equation for the alpha decay of Am.

Determine the identity of the daughter nuclide from the beta decay of Tc.

Which of the following elements would be expected to be particularly stable?

Write the nuclear equation for the alpha decay of Ra.

Define chain reaction in terms of the fission of uranium nucleus.

Determine the identity of the daughter nuclide from the beta decay of Pb.

Determine the identity of the daughter nuclide from the electron capture by Cl.

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

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

What percentage of a radioactive substance remains after 3.00 half-lives have elapsed?

Write a nuclear equation to describe the neutron induced fission of Pu to form Kr and Ce.Determine how many neutrons are produced in the reaction.

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

Essentials: Units, Measurements, and Problem Solving

Atoms

The Quantum Mechanical Model of the Atom

Periodic Properties of the Elements

Molecules and Compounds

Chemical Bonding I

Chemical Bonding Ii

Chemical Reactions and Chemical Quantities

Introduction to Solutions and Aqueous Reactions

Thermochemistry

Gases

Liquids, Solids, and Intermolecular Forces

Crystalline Solids and Modern Materials

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Organic Chemistry

Transition Metals and Coordination Compounds

Filters

Neptunium-239 has a half-life of 2.35 days.How many days must elapse for a sample of ²³⁹Np to decay to 1.00% of its original quantity?