Question 1

What is the decay constant for 131I if the half-life is 8.04 d?

Accepted Answer

A) 9.98 × 10-7 s-1 
B) 9.31 × 10-5 s-1 
C) 3.48 × 10-6 s-1 
D) 4.81 × 10-4 s-1 
A) 9.98 × 10-7 s-1 
B) 9.31 × 10-5 s-1 
C) 3.48 × 10-6 s-1 
D) 4.81 × 10-4 s-1

Question 2

A rock contains 0.313 mg of lead-206 for each milligram of uranium-238.The  
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 3

B decays via the reaction   Be →   E +   B+ + λ
What is the maximum energy of the gamma ray produced if atomic masses are:
    B = 11.00931 amu,   Be = 11.0216 amu,   E = 0.00055 amu? 
Please express your answer in electron volts,amu = 931.5 MeV.

Accepted Answer

A) 11.4 MeV 
B) 0.0118 MeV 
C) 13.2 MeV 
D) 12.0 MeV 
E) 10.8 MeV 
A) 11.4 MeV 
B) 0.0118 MeV 
C) 13.2 MeV 
D) 12.0 MeV 
E) 10.8 MeV

Question 4

Emission of which one of the following leaves both atomic number and mass number unchanged?

Accepted Answer

A) alpha particle 
B) positron 
C) neutron 
D) gamma radiation 
E) beta ray 
A) alpha particle 
B) positron 
C) neutron 
D) gamma radiation 
E) beta ray

Question 5

The binding energy per nucleon is largest for:

Accepted Answer

A) (3He) 
B) (59Co) 
C) (235U) 
D) (98Tc) 
E) (1H) 
A) (3He) 
B) (59Co) 
C) (235U) 
D) (98Tc) 
E) (1H)

Question 6

Which of the following nuclear species would require the least amount of kinetic energy to penetrate the nucleus of a lead (Pb)atom?

Accepted Answer

A)    H 
B)    He 
C)    H 
D)    n 
E)    He 
A)    H 
B)    He 
C)    H 
D)    n 
E)    He

Question 7

A nuclide has a decay constant of 4.28 × 10-4/h.If the activity of a sample is 3.14 × 105/s,how many atoms of the nuclide are present in the sample?

Accepted Answer

A) 7.34 × 108  
B) 2.64 × 1012  
C) 4.84 × 105  
D) 1.34 × 102  
E) 2.34 × 1011  
A) 7.34 × 108  
B) 2.64 × 1012  
C) 4.84 × 105  
D) 1.34 × 102  
E) 2.34 × 1011

Question 8

In the reaction   C +   He →   O 
how much energy is produced per gram of carbon used? 
Masses,in unified atomic mass units are: 
  C= 12.00000,   He= 4.00260,   O = 15.99491.
Express your answer in Joules/gram of carbon.

Accepted Answer

A) 2.10 × 1019 J/g 
B) 5.76 × 1010 J/g 
C) 7.77 × 104 J/g 
D) 2.80 × 1011 J/g 
E) 3.36 × 1015 J/g 
A) 2.10 × 1019 J/g 
B) 5.76 × 1010 J/g 
C) 7.77 × 104 J/g 
D) 2.80 × 1011 J/g 
E) 3.36 × 1015 J/g

Question 9

Potassium-40 decays to argon-40 with a half-life of 1.27 × 109 yr.The age of a mineral sample that has a mass ratio of 40Ar to 40K of 0.812 is ________ y.

Accepted Answer

A) 1.56 × 109 
B) 1.02 × 109 
C) 1.47 × 109 
D) 7.55 × 108 
E) 1.09 × 109 
A) 1.56 × 109 
B) 1.02 × 109 
C) 1.47 × 109 
D) 7.55 × 108 
E) 1.09 × 109

Question 10

Choose the possible products for the nuclear reaction 40Ca + 4He(alpha).

Accepted Answer

A) (43Ar + n) 
B) (43Sc + p) 
C) (43Ca + n) 
D) (42Ca + 2H) 
E) (42Ti + n) 
A) (43Ar + n) 
B) (43Sc + p) 
C) (43Ca + n) 
D) (42Ca + 2H) 
E) (42Ti + n)

Question 11

Which of the following is true concerning the nuclei of stable heavier elements?

Accepted Answer

A) #   n = #   p 
B) #   n > #   p 
C) #   n  #e- 
A) #   n = #   p 
B) #   n > #   p 
C) #   n  #e-

Question 12

An isotope which has too high a neutron-proton ratio can gain stability by:

Accepted Answer

A) beta emission 
B) K-capture 
C) proton emission 
D) gamma emission 
E) alpha emission 
A) beta emission 
B) K-capture 
C) proton emission 
D) gamma emission 
E) alpha emission

Question 13

Choose the INCORRECT statement.

Accepted Answer

A) Fusion is the basis of the hydrogen bomb. 
B) Fusion is the splitting of a nucleus into two smaller nuclei. 
C) Fusion is a reaction that occurs on the sun. 
D) Fusion is not now used to produce electricity commercially. 
E) Fusion can produce an almost unlimited amount of energy. 
A) Fusion is the basis of the hydrogen bomb. 
B) Fusion is the splitting of a nucleus into two smaller nuclei. 
C) Fusion is a reaction that occurs on the sun. 
D) Fusion is not now used to produce electricity commercially. 
E) Fusion can produce an almost unlimited amount of energy.

Question 14

Which of the following are true for alpha particles?
I.α particles are equivalent to 2   P+ 2   N.
II.α decay decreases the atomic number by four.
III.α particles are deflected more strongly than e- by magnetic fields,but in the opposite direction.
IV.α particles are easily stopped as they strike matter.

Accepted Answer

A) I and II 
B) I,II,III 
C) I and III 
D) I and IV 
E) I,II,III,and IV 
A) I and II 
B) I,II,III 
C) I and III 
D) I and IV 
E) I,II,III,and IV

Question 15

Choose the INCORRECT statement.

Accepted Answer

A) Geiger-M   ller counters detect radiation by the ionization caused in the gas in the counter. 
B) Bubble chambers detect radiation by the ionization trail left by the radiation. 
C) Radiation causes no harm to the human body. 
D) Radiation kills cancer cells more easily than normal cells. 
E) Alpha particles are less penetrating than beta particles. 
A) Geiger-M   ller counters detect radiation by the ionization caused in the gas in the counter. 
B) Bubble chambers detect radiation by the ionization trail left by the radiation. 
C) Radiation causes no harm to the human body. 
D) Radiation kills cancer cells more easily than normal cells. 
E) Alpha particles are less penetrating than beta particles.

Question 16

Choose the INCORRECT statement.

Accepted Answer

A) Radioactive 32P as a phosphate can be used to trace the uptake of phosphorus in plants. 
B) The thyroid gland can be studied by the use of radioactive iodine. 
C) There is no difference in physical properties between isotopes. 
D) The mechanism of a chemical reaction can be followed by a radioactive tracer such as 35S. 
E) Industrial catalysts can be followed by a tracer such as 192Ir. 
A) Radioactive 32P as a phosphate can be used to trace the uptake of phosphorus in plants. 
B) The thyroid gland can be studied by the use of radioactive iodine. 
C) There is no difference in physical properties between isotopes. 
D) The mechanism of a chemical reaction can be followed by a radioactive tracer such as 35S. 
E) Industrial catalysts can be followed by a tracer such as 192Ir.

Exam 25: Nuclear Chemistry

What is the decay constant for 131I if the half-life is 8.04 d?

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

B decays via the reaction Be → E + B+ + λ What is the maximum energy of the gamma ray produced if atomic masses are: B = 11.00931 amu, Be = 11.0216 amu, E = 0.00055 amu? Please express your answer in electron volts,amu = 931.5 MeV.

Emission of which one of the following leaves both atomic number and mass number unchanged?

The binding energy per nucleon is largest for:

Which of the following nuclear species would require the least amount of kinetic energy to penetrate the nucleus of a lead (Pb)atom?

A nuclide has a decay constant of 4.28 × 10-4/h.If the activity of a sample is 3.14 × 105/s,how many atoms of the nuclide are present in the sample?

In the reaction C + He → O how much energy is produced per gram of carbon used? Masses,in unified atomic mass units are: C= 12.00000, He= 4.00260, O = 15.99491. Express your answer in Joules/gram of carbon.

Potassium-40 decays to argon-40 with a half-life of 1.27 × 109 yr.The age of a mineral sample that has a mass ratio of 40Ar to 40K of 0.812 is ________ y.

Choose the possible products for the nuclear reaction 40Ca + 4He(alpha).

Which of the following is true concerning the nuclei of stable heavier elements?

An isotope which has too high a neutron-proton ratio can gain stability by:

Choose the INCORRECT statement.

Choose the INCORRECT statement.

Choose the INCORRECT statement.

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

What is the decay constant for ¹³¹I if the half-life is 8.04 d?

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

B decays via the reaction Be → E + B⁺ + λ What is the maximum energy of the gamma ray produced if atomic masses are: B = 11.00931 amu, Be = 11.0216 amu, E = 0.00055 amu? Please express your answer in electron volts,amu = 931.5 MeV.

A nuclide has a decay constant of 4.28 × 10^-4/h.If the activity of a sample is 3.14 × 10⁵/s,how many atoms of the nuclide are present in the sample?

Potassium-40 decays to argon-40 with a half-life of 1.27 × 10⁹ yr.The age of a mineral sample that has a mass ratio of ⁴⁰Ar to ⁴⁰K of 0.812 is ________ y.

Choose the possible products for the nuclear reaction ⁴⁰Ca + ⁴He(alpha).