Question 1

Explain the concept of "magic numbers."

Accepted Answer

They are even number

Question 2

Give the maximum age that can be estimated from radiocarbon dating.

Accepted Answer

A)  90,000 years. 
B)  1,000,000 years 
C)  50,000 years. 
D)  5,000 years. 
E)  30,000 years 
A)  90,000 years. 
B)  1,000,000 years 
C)  50,000 years. 
D)  5,000 years. 
E)  30,000 years

Question 3

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

Accepted Answer

A)    Kr 
B)    Sr 
C)    Br 
D)    Y 
E)    Kr 
A)    Kr 
B)    Sr 
C)    Br 
D)    Y 
E)    Kr

Question 4

A freshly prepared sample of curium-243 undergoes 3312 disintegrations per second.After 10.0 yr,the activity of the sample declines to 2437 disintegrations per second.The half-life of curium-243 is ________ yr.

Accepted Answer

A)  7.36 
B)  32.6 
C)  13.6 
D)  2.13 
E)  22.6 
A)  7.36 
B)  32.6 
C)  13.6 
D)  2.13 
E)  22.6

Question 5

Determine the binding energy of an F-19 nucleus.The F-19 nucleus has a mass of 18.99840325 amu.A proton has a mass of 1.00728 amu,a neutron has a mass of 1.008665 amu,and 1 amu is equivalent to 931 MeV of energy.

Accepted Answer

A)  142 MeV 
B)  796 MeV 
C)  1080 MeV 
D)  143 MeV 
E)  145 MeV 
A)  142 MeV 
B)  796 MeV 
C)  1080 MeV 
D)  143 MeV 
E)  145 MeV

Question 6

Atoms with Z > ________ are radioactive and decay in one or more steps involving mostly alpha and beta decay.

Accepted Answer

A)  60 
B)  110 
C)  83 
D)  160 
E)  30 
A)  60 
B)  110 
C)  83 
D)  160 
E)  30

Question 7

The half-life of cobalt-60 is 5.20 yr.How many milligrams of a 2.000-mg sample remains after 9.50 years?

Accepted Answer

A)  0.565 
B)  7.03 × 10-22 
C)  7.076 
D)  1.095 
E)  1.435 
A)  0.565 
B)  7.03 × 10-22 
C)  7.076 
D)  1.095 
E)  1.435

Question 8

Describe what is meant by the term "valley of stability"?

Accepted Answer

If a plot of number of neutrons vs.numbe

Question 9

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 10

Describe what changes occur during beta decay.

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 is unchanged 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 is unchanged and the atomic number increases. 
E)  The mass number and atomic number do not change.

Question 11

Describe what changes occur during alpha decay.

Accepted Answer

A)  The mass number and atomic number decreases. 
B)  The mass number and atomic number increases. 
C)  The mass number increases 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 increases 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 12

Stable isotopes,with low atomic numbers,have a N/Z ratio of 1.What does that imply?

Accepted Answer

A)  The number of neutrons equals the number of protons. 
B)  The number of neutrons equals the number of electrons. 
C)  The number of electrons equals the number of neutrons plus protons. 
D)  The atomic number equals the atomic mass. 
E)  The number of protons and the number of electrons equals the number of neutrons. 
A)  The number of neutrons equals the number of protons. 
B)  The number of neutrons equals the number of electrons. 
C)  The number of electrons equals the number of neutrons plus protons. 
D)  The atomic number equals the atomic mass. 
E)  The number of protons and the number of electrons equals the number of neutrons.

Question 13

Determine the binding energy of an H-3 nucleus.The H-3 nucleus has a mass of 3.0160 amu.A proton has a mass of 1.00728 amu,and a neutron has a mass of 1.008665 amu.

Accepted Answer

A)  3.75 × 1015 J/mol 
B)  6.47 × 105 J/mol 
C)  8.42 × 1013 J/mol 
D)  6.50 × 1011 J/mol 
E)  1.64 × 108 J/mol 
A)  3.75 × 1015 J/mol 
B)  6.47 × 105 J/mol 
C)  8.42 × 1013 J/mol 
D)  6.50 × 1011 J/mol 
E)  1.64 × 108 J/mol

Question 14

The amount of energy required to break apart the nucleus into its component nucleons is the

Accepted Answer

A)  mass defect. 
B)  alpha decay. 
C)  nuclear binding energy. 
D)  electron capture. 
E)  beta decay. 
A)  mass defect. 
B)  alpha decay. 
C)  nuclear binding energy. 
D)  electron capture. 
E)  beta decay.

Question 15

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

Accepted Answer

A)    O 
B)    C 
C)    O 
D)    B 
E)    F 
A)    O 
B)    C 
C)    O 
D)    B 
E)    F

Question 16

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

Accepted Answer

A)  Cs-137 
B)  I-131 
C)  Al-24 
D)  K-42 
E)  N-14 
A)  Cs-137 
B)  I-131 
C)  Al-24 
D)  K-42 
E)  N-14

Question 17

Give the goal of the Manhattan project.

Accepted Answer

A)  to build an hydrogen bomb 
B)  to build the first particle accelerator at Cornell 
C)  to build an atomic bomb 
D)  to build the first nuclear reactor to generate electricity for Manhattan 
E)  to set up the electrification of Manhattan using DC current 
A)  to build an hydrogen bomb 
B)  to build the first particle accelerator at Cornell 
C)  to build an atomic bomb 
D)  to build the first nuclear reactor to generate electricity for Manhattan 
E)  to set up the electrification of Manhattan using DC current

Question 18

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 19

Samarium-158 undergoes beta emission with a half-life of 5.30 minutes.If you start with 76.2 mg of the material,how long will it take until you have 18.9 mg of the sample?

Accepted Answer

A)  3.51 minutes 
B)  5.30 minutes 
C)  10.6 minutes 
D)  18.4 minutes 
E)  26.3 minutes 
A)  3.51 minutes 
B)  5.30 minutes 
C)  10.6 minutes 
D)  18.4 minutes 
E)  26.3 minutes

Question 20

The following reaction represents what nuclear process?   Th →   He +   Ra

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

Explain the concept of "magic numbers."

Give the maximum age that can be estimated from radiocarbon dating.

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

A freshly prepared sample of curium-243 undergoes 3312 disintegrations per second.After 10.0 yr,the activity of the sample declines to 2437 disintegrations per second.The half-life of curium-243 is ________ yr.

Determine the binding energy of an F-19 nucleus.The F-19 nucleus has a mass of 18.99840325 amu.A proton has a mass of 1.00728 amu,a neutron has a mass of 1.008665 amu,and 1 amu is equivalent to 931 MeV of energy.

Atoms with Z > ________ are radioactive and decay in one or more steps involving mostly alpha and beta decay.

The half-life of cobalt-60 is 5.20 yr.How many milligrams of a 2.000-mg sample remains after 9.50 years?

Describe what is meant by the term "valley of stability"?

Beta decay of 60Co produces a beta particle and

Describe what changes occur during beta decay.

Describe what changes occur during alpha decay.

Stable isotopes,with low atomic numbers,have a N/Z ratio of 1.What does that imply?

Determine the binding energy of an H-3 nucleus.The H-3 nucleus has a mass of 3.0160 amu.A proton has a mass of 1.00728 amu,and a neutron has a mass of 1.008665 amu.

The amount of energy required to break apart the nucleus into its component nucleons is the

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

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

Give the goal of the Manhattan project.

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.

Samarium-158 undergoes beta emission with a half-life of 5.30 minutes.If you start with 76.2 mg of the material,how long will it take until you have 18.9 mg of the sample?

The following reaction represents what nuclear process? Th → He + Ra

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

Beta decay of ⁶⁰Co produces a beta particle and