Question 1

How many 14C atoms are in a charcoal sample that has a decay rate of 3,500 disintegrations per min? (For 14C, t1/2 = 5,730 yr.)

Accepted Answer

A) 2.9 × 107 atoms 
B) 8.0 × 10-7 atoms 
C) 1.4 × 1014 atoms 
D) 1.5 × 1013 atoms 
E) 6.02 × 1020 atoms 
A) 2.9 × 107 atoms 
B) 8.0 × 10-7 atoms 
C) 1.4 × 1014 atoms 
D) 1.5 × 1013 atoms 
E) 6.02 × 1020 atoms

Question 2

The following nuclear equation is correctly balanced.

Accepted Answer

A) True 
 B)False

Question 3

Define free radicals.

Accepted Answer

molecular fragments

Question 4

The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 × 109 yr.A sample of moon rock was found to contain 78 argon-40 atoms for every 22 potassium-40 atoms.The age of the rock is

Accepted Answer

A) 8.1 × 10-10 yr 
B) 2.4 × 109 yr 
C) 2.8 × 109 yr 
D) 4.6 × 109 yr 
E) 6.8 × 109 yr 
A) 8.1 × 10-10 yr 
B) 2.4 × 109 yr 
C) 2.8 × 109 yr 
D) 4.6 × 109 yr 
E) 6.8 × 109 yr

Question 5

Predict the other product of the following nuclear transformation.   Li +   n   ____ +   He

Accepted Answer

A)    He 
B)    H 
C)    H 
D)    $\beta$ 
E)    H 
A)    He 
B)    H 
C)    H 
D)    $\beta$ 
E)    H

Question 6

Complete and balance the nuclear equation

Accepted Answer

The answer of Complete and balance the nuclear equation ...

Question 7

Cobalt-60 is a beta emitter with a half-life of 5.3 years.Approximately what fraction of the cobalt-60 atoms in a particular sample will remain after 32 years?

Accepted Answer

A) 1/6 
B) 1/8 
C) 1/16 
D) 1/32 
E) 1/64 
A) 1/6 
B) 1/8 
C) 1/16 
D) 1/32 
E) 1/64

Question 8

When a 87Br nucleus emits a beta particle, the nuclear species that results is ___________.

Accepted Answer

Question 9

Radioactive nitrogen-13 has a half-life of 10 minutes.After 40 minutes, how much of this isotope would remain in a sample that originally contained 96 mg?

Accepted Answer

The answer of Radioactive nitrogen-13 has a half-life of 10...

Question 10

The isotope with the greatest nuclear binding energy per nucleon is

Accepted Answer

A)    H 
B)    He 
C)    C 
D)    Fe 
E)    U 
A)    H 
B)    He 
C)    C 
D)    Fe 
E)    U

Question 11

Determine how much energy is released when thorium-230 decays according to     .[Atomic masses: thorium-230 = 230.033127 amu; helium-4 = 4.002603 amu; radium-226 = 226.025403 amu]

Accepted Answer

A) 3.98 × 109 kJ/mol 
B) 4.60 × 108 kJ/mol 
C) 7.20 × 1011 kJ/mol 
D) 4.90 × 109 kJ/mol 
E) 7.15 × 1011 kJ/mol 
A) 3.98 × 109 kJ/mol 
B) 4.60 × 108 kJ/mol 
C) 7.20 × 1011 kJ/mol 
D) 4.90 × 109 kJ/mol 
E) 7.15 × 1011 kJ/mol

Question 12

Which of the following is an example of a free radical?

Accepted Answer

A) H3O+ 
B) H2O2 
C) HO2- 
D) HO2· 
E) H2O 
A) H3O+ 
B) H2O2 
C) HO2- 
D) HO2· 
E) H2O

Question 13

What type of nuclear process is illustrated below?

Accepted Answer

The answer of What type of nuclear process is illustrated...

How many ¹⁴C atoms are in a charcoal sample that has a decay rate of 3,500 disintegrations per min? (For ¹⁴C, t_1/2 = 5,730 yr.)

The following nuclear equation is correctly balanced.

Define free radicals.

The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 × 10⁹ yr.A sample of moon rock was found to contain 78 argon-40 atoms for every 22 potassium-40 atoms.The age of the rock is

Predict the other product of the following nuclear transformation. Li + n ____ + He

Complete and balance the nuclear equation

Cobalt-60 is a beta emitter with a half-life of 5.3 years.Approximately what fraction of the cobalt-60 atoms in a particular sample will remain after 32 years?

When a ⁸⁷Br nucleus emits a beta particle, the nuclear species that results is ___________.

Radioactive nitrogen-13 has a half-life of 10 minutes.After 40 minutes, how much of this isotope would remain in a sample that originally contained 96 mg?

The isotope with the greatest nuclear binding energy per nucleon is

Determine how much energy is released when thorium-230 decays according to .[Atomic masses: thorium-230 = 230.033127 amu; helium-4 = 4.002603 amu; radium-226 = 226.025403 amu]

Which of the following is an example of a free radical?

What type of nuclear process is illustrated below?

Chemistry: the Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Gases

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

Exam 19: Nuclear Chemistry

How many 14C atoms are in a charcoal sample that has a decay rate of 3,500 disintegrations per min? (For 14C, t1/2 = 5,730 yr.)

The following nuclear equation is correctly balanced.

Define free radicals.

The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 × 109 yr.A sample of moon rock was found to contain 78 argon-40 atoms for every 22 potassium-40 atoms.The age of the rock is

Predict the other product of the following nuclear transformation. Li + n ____ + He

Complete and balance the nuclear equation

Cobalt-60 is a beta emitter with a half-life of 5.3 years.Approximately what fraction of the cobalt-60 atoms in a particular sample will remain after 32 years?

When a 87Br nucleus emits a beta particle, the nuclear species that results is ___________.

Radioactive nitrogen-13 has a half-life of 10 minutes.After 40 minutes, how much of this isotope would remain in a sample that originally contained 96 mg?

The isotope with the greatest nuclear binding energy per nucleon is

Determine how much energy is released when thorium-230 decays according to .[Atomic masses: thorium-230 = 230.033127 amu; helium-4 = 4.002603 amu; radium-226 = 226.025403 amu]

Which of the following is an example of a free radical?

What type of nuclear process is illustrated below?

Chemistry: the Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Gases

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

How many ¹⁴C atoms are in a charcoal sample that has a decay rate of 3,500 disintegrations per min? (For ¹⁴C, t_1/2 = 5,730 yr.)

The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 × 10⁹ yr.A sample of moon rock was found to contain 78 argon-40 atoms for every 22 potassium-40 atoms.The age of the rock is

When a ⁸⁷Br nucleus emits a beta particle, the nuclear species that results is ___________.