Question 1

Phosphorus-32 has a half-life of 14.3 days.How many grams remain from a 10.0 gram sample after 30.0 days?

Accepted Answer

A) 2.34 g 
B) 7.18 g 
C) 4.64 g 
D) 0.340 g 
E) 3.59 g 
A) 2.34 g 
B) 7.18 g 
C) 4.64 g 
D) 0.340 g 
E) 3.59 g A

Question 2

If the decay constant for 131I is 9.98 × 10-7 s-1,calculate the activity of a 1.00 mg sample.

Accepted Answer

A) 4.59 × 1012 atoms/s 
B) 4.73 × 1012 atoms/s 
C) 4.61 × 1024 atoms/s 
D) 9.98 × 10-4 atoms/s 
A) 4.59 × 1012 atoms/s 
B) 4.73 × 1012 atoms/s 
C) 4.61 × 1024 atoms/s 
D) 9.98 × 10-4 atoms/s A

Question 3

Artificially induced radioactivity is caused by bombarding a nucleus with another particle.

Accepted Answer

A) True 
 B)False  True

Question 4

Transuranium elements are elements with atomic numbers greater than 92.

Accepted Answer

A) True 
 B)False

Question 5

In addition to a beta particle,what is the other product of beta decay of   Pb?

Accepted Answer

A)    Hg 
B)    Tl 
C)    Bi 
D)    Po 
A)    Hg 
B)    Tl 
C)    Bi 
D)    Po

Question 6

Fe can be prepared by electron-capture from ________.

Accepted Answer

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

Question 7

Fission is the process of combining small nuclei into larger nuclei.

Accepted Answer

A) True 
 B)False

Question 8

Radioactivity is a first order kinetics process.

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A)    Pt 
B)    Pt 
C)    Pt 
D)    Pt 
A)    Pt 
B)    Pt 
C)    Pt 
D)    Pt

Question 10

A certain radioactive series starts with   U and ends with   Pb.In the overall process,________ alpha particles and ________ beta particles are emitted.

Accepted Answer

A) 7,10 
B) 7,4 
C) 8,6 
D) 14,10 
E) 7,8 
A) 7,10 
B) 7,4 
C) 8,6 
D) 14,10 
E) 7,8

Question 11

A wooden artifact is subjected to radiocarbon dating.The activity associated with its 14C content is 12 dis min-1 g-1.A sample of wood from a modern source gave 15 dis min-1 g-1.If the half-life of 14C is 5730 y,what is the age of the artifact?

Accepted Answer

A) 1.8 × 103 y 
B) 800 y 
C) 1.3 × 103 y 
D) 7.2 × 103 y 
A) 1.8 × 103 y 
B) 800 y 
C) 1.3 × 103 y 
D) 7.2 × 103 y

Question 12

The observation that a 30 g sample of C-14 has a decay rate faster than that of a 20 g sample of C-14 would be consistent with the:

Accepted Answer

A) Half-Life Principle 
B) Disintegration Rule 
C) Radioactive decay law 
D) Mass-Rate Principle 
E) Mass-decay ratio 
A) Half-Life Principle 
B) Disintegration Rule 
C) Radioactive decay law 
D) Mass-Rate Principle 
E) Mass-decay ratio

Question 13

On forming the nuclide from the protons,neutrons and electrons,the mass loss per nucleon for the   He is 0.00759 amu,whereas that for   Fe is 0.00944 amu.This means that:

Accepted Answer

A)    Fe undergoes nuclear fission 
B)    He is more stable than   Fe 
C) thirteen   He nuclei could react to form one   Fe nucleus 
D)    Fe is more stable than   He 
E)    He weighs more than   Fe 
A)    Fe undergoes nuclear fission 
B)    He is more stable than   Fe 
C) thirteen   He nuclei could react to form one   Fe nucleus 
D)    Fe is more stable than   He 
E)    He weighs more than   Fe

Question 14

Carbon-11 is used in medical imaging.The half-life of this radioisotope is 20.4 min.What percentage of a sample remains after 60.0 min?

Accepted Answer

A) 71.2 
B) 5.28 
C) 13.0 
D) 34.0 
E) 2.94 
A) 71.2 
B) 5.28 
C) 13.0 
D) 34.0 
E) 2.94

Question 15

A certain isotope has a half-life of 14.7 min.How long will it take for 24.2% of the isotope to decay?

Accepted Answer

A) 5.88 min 
B) 30.1 min 
C) 4.07 min 
D) 0.0131 min 
E) 0.400 min 
A) 5.88 min 
B) 30.1 min 
C) 4.07 min 
D) 0.0131 min 
E) 0.400 min

Question 16

When   Sr undergoes positron emission,the product nucleus is ________.

Accepted Answer

A)    Rb 
B)    Sr 
C)    Y 
D)    Sr 
E)    Y 
A)    Rb 
B)    Sr 
C)    Y 
D)    Sr 
E)    Y

Question 17

Most periodic tables indicate the elements for which all isotopes are radioactive.Which pair of elements with atomic number less than 83 have only radioactive isotopes?

Accepted Answer

A) Pb and At 
B) Tc and Cd 
C) K and Pm 
D) Tc and Pm 
E) C and K 
A) Pb and At 
B) Tc and Cd 
C) K and Pm 
D) Tc and Pm 
E) C and K

Question 18

A freshly prepared sample of curium-243 undergoes 3312 disintegrations per second.After 6.00 y. ,the activity of the sample declines to 2755 disintegrations per second.The   Of   Is ________ y.

Accepted Answer

A) 4.99 
B) 32.6 
C) 7.21 
D) 0.765 
E) 22.6 
A) 4.99 
B) 32.6 
C) 7.21 
D) 0.765 
E) 22.6

Question 19

Cancerous cells are more easily killed by radiation than normal cells.

Accepted Answer

A) True 
 B)False

Question 20

The unit of radiation which is equivalent to 0.010 J/kg of matter is the:

Accepted Answer

A) curie 
B) roentgen 
C) rad 
D) rem 
E) MeV 
A) curie 
B) roentgen 
C) rad 
D) rem 
E) MeV

Exam 25: Nuclear Chemistry

Phosphorus-32 has a half-life of 14.3 days.How many grams remain from a 10.0 gram sample after 30.0 days?

If the decay constant for 131I is 9.98 × 10-7 s-1,calculate the activity of a 1.00 mg sample.

Artificially induced radioactivity is caused by bombarding a nucleus with another particle.

Transuranium elements are elements with atomic numbers greater than 92.

In addition to a beta particle,what is the other product of beta decay of Pb?

Fe can be prepared by electron-capture from ________.

Fission is the process of combining small nuclei into larger nuclei.

Radioactivity is a first order kinetics process.

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

A certain radioactive series starts with U and ends with Pb.In the overall process,________ alpha particles and ________ beta particles are emitted.

A wooden artifact is subjected to radiocarbon dating.The activity associated with its 14C content is 12 dis min-1 g-1.A sample of wood from a modern source gave 15 dis min-1 g-1.If the half-life of 14C is 5730 y,what is the age of the artifact?

The observation that a 30 g sample of C-14 has a decay rate faster than that of a 20 g sample of C-14 would be consistent with the:

On forming the nuclide from the protons,neutrons and electrons,the mass loss per nucleon for the He is 0.00759 amu,whereas that for Fe is 0.00944 amu.This means that:

Carbon-11 is used in medical imaging.The half-life of this radioisotope is 20.4 min.What percentage of a sample remains after 60.0 min?

A certain isotope has a half-life of 14.7 min.How long will it take for 24.2% of the isotope to decay?

When Sr undergoes positron emission,the product nucleus is ________.

Most periodic tables indicate the elements for which all isotopes are radioactive.Which pair of elements with atomic number less than 83 have only radioactive isotopes?

A freshly prepared sample of curium-243 undergoes 3312 disintegrations per second.After 6.00 y. ,the activity of the sample declines to 2755 disintegrations per second.The Of Is ________ y.

Cancerous cells are more easily killed by radiation than normal cells.

The unit of radiation which is equivalent to 0.010 J/kg of matter is the:

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

If the decay constant for ¹³¹I is 9.98 × 10^-7 s^-1,calculate the activity of a 1.00 mg sample.

A certain radioactive series starts with U and ends with Pb.In the overall process, alpha particles and beta particles are emitted.

A wooden artifact is subjected to radiocarbon dating.The activity associated with its ¹⁴C content is 12 dis min^-1 g^-1.A sample of wood from a modern source gave 15 dis min^-1 g^-1.If the half-life of ¹⁴C is 5730 y,what is the age of the artifact?