Question 1

The decay curve shown below approximates the decay of phosphorus-32.What is the approximate half-life of phosphorus-32?

Accepted Answer

A) 14 days 
B) 27 days 
C) 35 days 
D) 37.5 days 
A) 14 days 
B) 27 days 
C) 35 days 
D) 37.5 days

Question 2

Carbon-14 has a half-life of 5715 years.Currently living organisms decay at a rate of 15.3 disintegrations/ min per gram of carbon.If an archeological artifact has a carbon-14 decay rate of 12.0 disintegrations/ min per gram of carbon,the approximate age of the artifact is ________ years old.

Accepted Answer

The answer of Carbon-14 has a half-life of 5715 years.Currently...

Question 3

"Isotopes" are atoms with the same number of ________ but different number of ________.

Accepted Answer

A) electrons,neutrons 
B) neutrons,protons 
C) protons,electrons 
D) protons,neutrons 
A) electrons,neutrons 
B) neutrons,protons 
C) protons,electrons 
D) protons,neutrons

Question 4

Radiocarbon dating involves the unbalanced equation shown below.Needed to balance this equation is ________.This is an example of ________ decay.   C →   N + ?

Accepted Answer

The answer of Radiocarbon dating involves the unbalanced equation shown...

Question 5

What does the term "critical mass" mean? It is the

Accepted Answer

A) amount of fissionable material which will self-sustain a nuclear chain reaction. 
B) difference between mass of individual protons and neutrons and the mass of the nucleus. 
C) energy which holds the nucleus together. 
D) mass of fuel in a nuclear reactor core. 
A) amount of fissionable material which will self-sustain a nuclear chain reaction. 
B) difference between mass of individual protons and neutrons and the mass of the nucleus. 
C) energy which holds the nucleus together. 
D) mass of fuel in a nuclear reactor core.

Question 6

The mass of a helium-4 nucleus is ________ (greater than,less than,the same as)the sum of the masses of two protons plus two neutrons.

Accepted Answer

The answer of The mass of a helium-4 nucleus is...

Question 7

A rad is

Accepted Answer

A) the amount of sample that undergoes 1 disintegration per second. 
B) the amount of sample that undergoes 3.7 × 1010 disintegrations per second. 
C) the amount of tissue damage done by radiation. 
D) equal to 0.01 J of energy absorbed per kilogram of tissue. 
A) the amount of sample that undergoes 1 disintegration per second. 
B) the amount of sample that undergoes 3.7 × 1010 disintegrations per second. 
C) the amount of tissue damage done by radiation. 
D) equal to 0.01 J of energy absorbed per kilogram of tissue.

Question 8

Tell the type of decay process occurring in the following nuclear reaction.

Accepted Answer

A) α emission 
B) β emission 
C) γ emission 
D) electron capture or positron emission 
A) α emission 
B) β emission 
C) γ emission 
D) electron capture or positron emission

Question 9

Gamma radiation can be described as

Accepted Answer

A) a helium nucleus. 
B) a negatively charged free electron. 
C) high energy electromagnetic radiation. 
D) a positively charged free electron. 
A) a helium nucleus. 
B) a negatively charged free electron. 
C) high energy electromagnetic radiation. 
D) a positively charged free electron.

Question 10

When a substance decays by beta emission,the mass number of the nucleus ________ and the atomic number ________.

Accepted Answer

A) decreases by 2,remains the same 
B) increases by 2,remains the same 
C) remains the same,decreases by 1 
D) remains the same,increases by 1 
A) decreases by 2,remains the same 
B) increases by 2,remains the same 
C) remains the same,decreases by 1 
D) remains the same,increases by 1

Question 11

Nitrogen-14 (14.003074 amu)is synthesized in the sun by fusion of 13C (13.003355 amu)and 1H (1.007825 amu).How much energy is released in this nuclear reaction?

Accepted Answer

A) 2.432 × 106 kJ/mol 
B) 7.295 × 108 kJ/mol 
C) 9.141 × 1010 kJ/mol 
D) 1.807 × 1011 kJ/mol 
A) 2.432 × 106 kJ/mol 
B) 7.295 × 108 kJ/mol 
C) 9.141 × 1010 kJ/mol 
D) 1.807 × 1011 kJ/mol

Question 12

The decay curve shown below approximates the decay of cobalt-60.What is the approximate half-life of cobalt-60?

Accepted Answer

A) 5 years 
B) 12.5 years 
C) 15 years 
D) 17.5 years 
A) 5 years 
B) 12.5 years 
C) 15 years 
D) 17.5 years

Question 13

Which of the following isotopes is the most stable?

Accepted Answer

A) .6He,4.89 MeV/nucleon 
B) .20Ne,8.03 MeV/nucleon 
C) .94Zr,8.67 MeV/nucleon 
D) .240Pu,7.26 MeV/nucleon 
A) .6He,4.89 MeV/nucleon 
B) .20Ne,8.03 MeV/nucleon 
C) .94Zr,8.67 MeV/nucleon 
D) .240Pu,7.26 MeV/nucleon

Question 14

As the atomic number of the elements increases,the ratio of neutrons to protons in stable nuclei

Accepted Answer

A) decreases. 
B) stays the same. 
C) increases. 
D) is unrelated to stability. 
A) decreases. 
B) stays the same. 
C) increases. 
D) is unrelated to stability.

Question 15

If the mass of one neutron is 1.00866 amu,the mass of one proton is 1.00728 amu,and the mass of 14C nucleus is 13.99995 amu,calculate the binding energy for the 14C nucleus.

Accepted Answer

A) 9.92 × 109 kJ/mol 
B) 1.02 × 1010 kJ/mol 
C) 5.54 × 1011 kJ/mol 
D) 5.95 × 1011 kJ/mol 
A) 9.92 × 109 kJ/mol 
B) 1.02 × 1010 kJ/mol 
C) 5.54 × 1011 kJ/mol 
D) 5.95 × 1011 kJ/mol

Question 16

Nuclei that are in the band of stability have a neutron/proton ratio ________ (equal to,greater than,less than)1:1.

Accepted Answer

The answer of Nuclei that are in the band of...

Question 17

Which reaction below represents   O decay by positron emission?

Accepted Answer

A)   
O →
  
E +
  
Ra 
B)   
O →
  
E +
  
N 
C)   
O →
  
E +
  
O 
D)   
O →
  
E +
  
O 
A)   
O →
  
E +
  
Ra 
B)   
O →
  
E +
  
N 
C)   
O →
  
E +
  
O 
D)   
O →
  
E +
  
O

Question 18

Which of the following nuclides is most likely to undergo beta decay?

Accepted Answer

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

Question 19

In fusion reactions to make superheavy elements,energy is required to bring the two nuclei together and to form additional mass.How much energy must be converted into mass for the alpha bombardment of 253Es to form 257Md? (The isotopic masses are 253Es = 253.08294 amu,4He = 4.00260 amu,257Md = 257.09558 amu. )

Accepted Answer

A) 3.01 × 106 kJ/mol 
B) 9.04 × 108 kJ/mol 
C) 3.59 × 1011 kJ/mol 
D) 7.21 × 1011 kJ/mol 
A) 3.01 × 106 kJ/mol 
B) 9.04 × 108 kJ/mol 
C) 3.59 × 1011 kJ/mol 
D) 7.21 × 1011 kJ/mol

Question 20

A small block of wood or heavy clothing can form an effective shield against what type of radiation?

Accepted Answer

A) beta particles 
B) cosmic rays 
C) gamma rays 
D) neutrons 
A) beta particles 
B) cosmic rays 
C) gamma rays 
D) neutrons

Exam 19: Nuclear Chemistry

The decay curve shown below approximates the decay of phosphorus-32.What is the approximate half-life of phosphorus-32?

Carbon-14 has a half-life of 5715 years.Currently living organisms decay at a rate of 15.3 disintegrations/ min per gram of carbon.If an archeological artifact has a carbon-14 decay rate of 12.0 disintegrations/ min per gram of carbon,the approximate age of the artifact is ________ years old.

"Isotopes" are atoms with the same number of ________ but different number of ________.

Radiocarbon dating involves the unbalanced equation shown below.Needed to balance this equation is ________.This is an example of ________ decay. C → N + ?

What does the term "critical mass" mean? It is the

The mass of a helium-4 nucleus is ________ (greater than,less than,the same as)the sum of the masses of two protons plus two neutrons.

A rad is

Tell the type of decay process occurring in the following nuclear reaction.

Gamma radiation can be described as

When a substance decays by beta emission,the mass number of the nucleus ________ and the atomic number ________.

Nitrogen-14 (14.003074 amu)is synthesized in the sun by fusion of 13C (13.003355 amu)and 1H (1.007825 amu).How much energy is released in this nuclear reaction?

The decay curve shown below approximates the decay of cobalt-60.What is the approximate half-life of cobalt-60?

Which of the following isotopes is the most stable?

As the atomic number of the elements increases,the ratio of neutrons to protons in stable nuclei

If the mass of one neutron is 1.00866 amu,the mass of one proton is 1.00728 amu,and the mass of 14C nucleus is 13.99995 amu,calculate the binding energy for the 14C nucleus.

Nuclei that are in the band of stability have a neutron/proton ratio ________ (equal to,greater than,less than)1:1.

Which reaction below represents O decay by positron emission?

Which of the following nuclides is most likely to undergo beta decay?

A small block of wood or heavy clothing can form an effective shield against what type of radiation?

Chemical Tools: Experimentation and Measurement

Atoms, molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Periodicity and the Electronic Structure of Atoms

Ionic Compounds: Periodic Trends and Bonding

Covalent Bonding and Electron-Dot Structures

Covalent Compounds: Bonding Theories and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids, solids, and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

The Main-Group Elements

Connections to Organic and Biological Chemistry

Filters

"Isotopes" are atoms with the same number of but different number of .

Radiocarbon dating involves the unbalanced equation shown below.Needed to balance this equation is .This is an example of decay. C → N + ?

When a substance decays by beta emission,the mass number of the nucleus and the atomic number .

Nitrogen-14 (14.003074 amu)is synthesized in the sun by fusion of ¹³C (13.003355 amu)and ¹H (1.007825 amu).How much energy is released in this nuclear reaction?

If the mass of one neutron is 1.00866 amu,the mass of one proton is 1.00728 amu,and the mass of ¹⁴C nucleus is 13.99995 amu,calculate the binding energy for the ¹⁴C nucleus.