Question 1

Radium-226 decays by alpha emission.What is its decay product?

Accepted Answer

A)    Fr 
B)    Rn 
C)    Th 
D)    Ac 
E)    Po 
A)    Fr 
B)    Rn 
C)    Th 
D)    Ac 
E)    Po

Question 2

Tritium is a radioisotope of hydrogen having a half-life of 12.3 years.If you initially had 1.0 × 10-7 mole of tritium, calculate the decay rate of the sample.

Accepted Answer

Question 3

Estimate the age of a bottled wine that has a tritium, 3H, content 60% that of freshly bottled wine.Tritium decays by beta decay and has a half-life of 12.3 yr.

Accepted Answer

A) 0.029 yr 
B) 7.4 yr 
C) 9.1 yr 
D) 16 yr 
E) 35 yr 
A) 0.029 yr 
B) 7.4 yr 
C) 9.1 yr 
D) 16 yr 
E) 35 yr

Question 4

Which one of the following statements about fission and fusion is false?

Accepted Answer

A) Fission occurs among the heaviest isotopes, whereas fusion occurs more readily for light isotopes. 
B) For a fission reaction the mass defect ($\Delta$m)is negative, whereas for fusion $\Delta$m is positive. 
C) In order for fusion reactions to occur, temperatures must be in the millions of degrees. 
D) The fission of Pu-239 atoms produces a great number of isotopes of a large number of elements. 
E) Neutron-induced fission processes can occur at room temperature, rather than at millions of degrees. 
A) Fission occurs among the heaviest isotopes, whereas fusion occurs more readily for light isotopes. 
B) For a fission reaction the mass defect ($\Delta$m)is negative, whereas for fusion $\Delta$m is positive. 
C) In order for fusion reactions to occur, temperatures must be in the millions of degrees. 
D) The fission of Pu-239 atoms produces a great number of isotopes of a large number of elements. 
E) Neutron-induced fission processes can occur at room temperature, rather than at millions of degrees.

Question 5

Which isotope, when bombarded with oxygen-18, yields the artificial isotope seaborgium-263 plus 4 neutrons?

Accepted Answer

A) nobelium-245 
B) radium-259 
C) californium-245 
D) nobelium-249 
E) californium-249 
A) nobelium-245 
B) radium-259 
C) californium-245 
D) nobelium-249 
E) californium-249

Question 6

Naturally occurring uranium contains approximately 1% U-235 and 99% U-238.Of these, the isotope that undergoes fission in a nuclear reactor is U-238.

Accepted Answer

A) True 
 B)False

Question 7

Sulfur-35 decays by beta emission.The decay product is

Accepted Answer

A)    P 
B)    S 
C)    Si 
D)    Cl 
E)    Cl 
A)    P 
B)    S 
C)    Si 
D)    Cl 
E)    Cl

Question 8

What type of nuclear process is illustrated below?

Accepted Answer

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

Question 9

Alpha particles are identical to

Accepted Answer

A) protons. 
B) helium atoms. 
C) hydrogen atoms. 
D) helium nuclei. 
E) electrons. 
A) protons. 
B) helium atoms. 
C) hydrogen atoms. 
D) helium nuclei. 
E) electrons.

Question 10

The rates of radioactive decay processes, like the rates of chemical reactions, are sensitive to temperature changes.

Accepted Answer

A) True 
 B)False

Question 11

Balance the equation

Accepted Answer

The answer of Balance the equation  ...

Question 12

Present-day plant life has a carbon-14 decay rate of 16 disintegrations per minute (dpm)per gram of carbon.If a contemporary wooden chair were somehow preserved for the next 3,900 years, what 14C decay rate should be expected from the wood used to make the chair? (t1/2 = 5,730 yr)

Accepted Answer

A) 26 dpm 
B) 12 dpm 
C) 11 dpm 
D) 10 dpm 
E) 8 dpm 
A) 26 dpm 
B) 12 dpm 
C) 11 dpm 
D) 10 dpm 
E) 8 dpm

Question 13

Predict which nucleus is less stable,   or   .

Accepted Answer

The answer of Predict which nucleus is less stable, ...

Question 14

Rubidium-87 decays by beta decay with a half-life of 4.9 × 1010 yr.How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3,500 disintegrations per hour?

Accepted Answer

A) 9.0 × 1016 atoms 
B) 4.3 × 10-4 atoms 
C) 2.2 × 1018 atoms 
D) 2.5 × 1014 atoms 
E) 1.7 × 1014 atoms 
A) 9.0 × 1016 atoms 
B) 4.3 × 10-4 atoms 
C) 2.2 × 1018 atoms 
D) 2.5 × 1014 atoms 
E) 1.7 × 1014 atoms

Question 15

When atoms of aluminum-27 are bombarded with alpha particles, a neutron and an element are produced.The particular isotope formed is   He +   Al     n + ____

Accepted Answer

A)    Si 
B)    Si 
C)    S 
D)    P 
E)    P 
A)    Si 
B)    Si 
C)    S 
D)    P 
E)    P

Question 16

The only stable isotope of iodine is iodine-127.Predict the mode of decay of   I.

Accepted Answer

A) alpha emission 
B) beta emission 
C) positron emission 
D) electron capture 
A) alpha emission 
B) beta emission 
C) positron emission 
D) electron capture

Question 17

The fundamental unit of radioactivity is the ______ (Ci)

Accepted Answer

The answer of The fundamental unit of radioactivity is the...

Question 18

List the given types of nuclear radiation (cosmic rays, medical and dental X rays, and nuclear waste) in order of how much each contributes to the average yearly dose of nuclear radiation for AmericAns :

Accepted Answer

A) cosmic rays < medical and dental X rays < nuclear waste 
B) medical and dental X rays < cosmic rays < nuclear waste 
C) nuclear waste < cosmic rays < medical and dental X rays 
D) cosmic rays < nuclear waste < medical and dental X rays 
E) medical and dental X rays < nuclear waste < cosmic rays 
A) cosmic rays < medical and dental X rays < nuclear waste 
B) medical and dental X rays < cosmic rays < nuclear waste 
C) nuclear waste < cosmic rays < medical and dental X rays 
D) cosmic rays < nuclear waste < medical and dental X rays 
E) medical and dental X rays < nuclear waste < cosmic rays

Question 19

Calculate the energy released in joules when one mole of polonium-214 decays according to the equation   Po     Pb +   He. [Atomic masses: Pb-210 = 209.98284 amu, Po-214 = 213.99519 amu, He-4 = 4.00260 amu.]

Accepted Answer

A) 8.78 × 1014 J/mol 
B) 7.2 × 1014 J/mol 
C) 8.78 × 1011 J/mol 
D) -9.75 × 10-3 J/mol 
E) 1.46 × 10-9 J/mol 
A) 8.78 × 1014 J/mol 
B) 7.2 × 1014 J/mol 
C) 8.78 × 1011 J/mol 
D) -9.75 × 10-3 J/mol 
E) 1.46 × 10-9 J/mol

Question 20

If 24% of a certain radioisotope decays in 6.5 years, what is the half-life of this isotope?

Accepted Answer

A) 3.9 yr 
B) 16 yr 
C) 0.22 yr 
D) 2.2 yr 
E) 3.2 yr 
A) 3.9 yr 
B) 16 yr 
C) 0.22 yr 
D) 2.2 yr 
E) 3.2 yr

Exam 19: Nuclear Chemistry

Radium-226 decays by alpha emission.What is its decay product?

Tritium is a radioisotope of hydrogen having a half-life of 12.3 years.If you initially had 1.0 × 10-7 mole of tritium, calculate the decay rate of the sample.

Estimate the age of a bottled wine that has a tritium, 3H, content 60% that of freshly bottled wine.Tritium decays by beta decay and has a half-life of 12.3 yr.

Which one of the following statements about fission and fusion is false?

Which isotope, when bombarded with oxygen-18, yields the artificial isotope seaborgium-263 plus 4 neutrons?

Naturally occurring uranium contains approximately 1% U-235 and 99% U-238.Of these, the isotope that undergoes fission in a nuclear reactor is U-238.

Sulfur-35 decays by beta emission.The decay product is

What type of nuclear process is illustrated below?

Alpha particles are identical to

The rates of radioactive decay processes, like the rates of chemical reactions, are sensitive to temperature changes.

Balance the equation

Present-day plant life has a carbon-14 decay rate of 16 disintegrations per minute (dpm)per gram of carbon.If a contemporary wooden chair were somehow preserved for the next 3,900 years, what 14C decay rate should be expected from the wood used to make the chair? (t1/2 = 5,730 yr)

Predict which nucleus is less stable, or .

Rubidium-87 decays by beta decay with a half-life of 4.9 × 1010 yr.How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3,500 disintegrations per hour?

When atoms of aluminum-27 are bombarded with alpha particles, a neutron and an element are produced.The particular isotope formed is He + Al n + ____

The only stable isotope of iodine is iodine-127.Predict the mode of decay of I.

The fundamental unit of radioactivity is the ______ (Ci)

List the given types of nuclear radiation (cosmic rays, medical and dental X rays, and nuclear waste) in order of how much each contributes to the average yearly dose of nuclear radiation for AmericAns :

Calculate the energy released in joules when one mole of polonium-214 decays according to the equation Po Pb + He. [Atomic masses: Pb-210 = 209.98284 amu, Po-214 = 213.99519 amu, He-4 = 4.00260 amu.]

If 24% of a certain radioisotope decays in 6.5 years, what is the half-life of this isotope?

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

Tritium is a radioisotope of hydrogen having a half-life of 12.3 years.If you initially had 1.0 × 10^-7 mole of tritium, calculate the decay rate of the sample.

Estimate the age of a bottled wine that has a tritium,³H, content 60% that of freshly bottled wine.Tritium decays by beta decay and has a half-life of 12.3 yr.

Present-day plant life has a carbon-14 decay rate of 16 disintegrations per minute (dpm)per gram of carbon.If a contemporary wooden chair were somehow preserved for the next 3,900 years, what ¹⁴C decay rate should be expected from the wood used to make the chair? (t_1/2= 5,730 yr)

Rubidium-87 decays by beta decay with a half-life of 4.9 × 10¹⁰ yr.How many ⁸⁷Rb atoms are in a moon rock sample that has a rubidium decay rate of 3,500 disintegrations per hour?