Question 1

Balance the equation

Accepted Answer

The answer of Balance the equation  ...

Question 2

Which of the following is characteristic of a nuclear reaction? I.Electrons in atomic orbitals are involved in the breaking and forming of bonds
II.Elements are converted from one to another
III.Reaction rates are typically not affected by catalysts
IV.Atoms are rearranged by the breaking and forming of chemical bonds

Accepted Answer

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

Question 3

Determine the decay rate for a radioisotope sample with an activity of 12 microcuries? [1 curie = 3.7 × 1010 disintegrations/s]

Accepted Answer

Question 4

Carbon-11 is a radioactive isotope of carbon.Its half-life is 20.3 minutes.What fraction of the initial number of carbon-11 atoms in a sample will remain after 81 minutes?

Accepted Answer

A) 1/16 
B) 1/4 
C) 1/2 
D) 1/32 
E) 1/8 
A) 1/16 
B) 1/4 
C) 1/2 
D) 1/32 
E) 1/8

Question 5

Consider the following decay series:   What type of nuclear process occurs at the transformation labeled I?

Accepted Answer

A) ($\alpha$ emission) 
B) ($\beta$ emission) 
C) positron emission 
D) electron capture 
E) gamma radiation 
A) ($\alpha$ emission) 
B) ($\beta$ emission) 
C) positron emission 
D) electron capture 
E) gamma radiation

Question 6

Cobalt-60 is a beta emitter with a half-life of 5.3 years.Approximately what fraction of cobalt-60 atoms will remain in a particular sample after 26.5 years?

Accepted Answer

A) 1/5 
B) 1/16 
C) 1/26 
D) 1/32 
E) 1/64 
A) 1/5 
B) 1/16 
C) 1/26 
D) 1/32 
E) 1/64

Question 7

On a neutron number versus proton number plot, the nucleus of oxygen-15 lies below the belt of stability.Write an equation for the radioactive decay of oxygen-15.

Accepted Answer

The answer of On a neutron number versus proton number...

Question 8

List the different types of nuclear radiation (alpha, beta, gamma)in order of increasing penetrating power.

Accepted Answer

A) alpha < beta < gamma 
B) beta < alpha < gamma 
C) gamma < alpha < beta 
D) gamma < beta < alpha 
E) alpha < gamma < beta 
A) alpha < beta < gamma 
B) beta < alpha < gamma 
C) gamma < alpha < beta 
D) gamma < beta < alpha 
E) alpha < gamma < beta

Question 9

Determine how much energy is released when polonium-210 decays according to     .[Atomic masses: polonium-210 = 209.982857 amu; helium-4 = 4.002603 amu; lead-206 = 205.974449 amu]

Accepted Answer

A) 4.14 × 109 kJ/mol 
B) 7.20 × 1011 kJ/mol 
C) 5.22 × 108 kJ/mol 
D) 4.66 × 109 kJ/mol 
E) 6.43 × 1012 kJ/mol 
A) 4.14 × 109 kJ/mol 
B) 7.20 × 1011 kJ/mol 
C) 5.22 × 108 kJ/mol 
D) 4.66 × 109 kJ/mol 
E) 6.43 × 1012 kJ/mol

Question 10

Charcoal found under a stone at Stonehenge, England, has a carbon-14 activity that is 0.60 that of new wood.How old is the charcoal? (The half-life of carbon-14 is 5,730 years.)

Accepted Answer

A) Less than 5,730 yr 
B) Between 5,730 and 11,460 yr 
C) Between 11,460 and 17,190 yr 
D) More than 17,190 yr 
A) Less than 5,730 yr 
B) Between 5,730 and 11,460 yr 
C) Between 11,460 and 17,190 yr 
D) More than 17,190 yr

Question 11

The isotope of iodine with mass number 128 undergoes beta decay with a half-life of 25.00 minutes.Write a balanced nuclear reaction for this process.

Accepted Answer

The answer of The isotope of iodine with mass number...

Question 12

What nuclear fuel is produced in a breeder reactor?

Accepted Answer

The answer of What nuclear fuel is produced in a...

Question 13

Complete and balance the nuclear equation

Accepted Answer

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

Question 14

Decay of silicon-27 by positron emission yields

Accepted Answer

A) magnesium-23. 
B) sulfur-31. 
C) phosphorus-27. 
D) silicon-26. 
E) aluminum-27. 
A) magnesium-23. 
B) sulfur-31. 
C) phosphorus-27. 
D) silicon-26. 
E) aluminum-27.

Question 15

Describe the role of a moderator in a fission reactor, and give examples of two substances that are used as moderators.

Accepted Answer

Moderators slow the neutrons a

Question 16

Decay of lutetium-167 by electron capture yields

Accepted Answer

A) ytterbium-167. 
B) lutetium-166. 
C) thulium-163. 
D) tantalum-171. 
E) hafnium-167. 
A) ytterbium-167. 
B) lutetium-166. 
C) thulium-163. 
D) tantalum-171. 
E) hafnium-167.

Question 17

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, how many moles of tritium would be left after 78 years?

Accepted Answer

Question 18

Predict which nucleus is less stable,   or   .

Accepted Answer

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

Question 19

The carbon-14 activity of some ancient Indian corn was found to be 7.0 disintegrations per minute (dpm)per gram of carbon.If present-day plant life has 16 dpm per gram of carbon, how old is the Indian corn? (t1/2 = 5,730 yr)

Accepted Answer

A) 6,800 yr 
B) 2,500 yr 
C) 4,700 yr 
D) 10,000 yr 
E) 7,200 yr 
A) 6,800 yr 
B) 2,500 yr 
C) 4,700 yr 
D) 10,000 yr 
E) 7,200 yr

Question 20

Consider the following decay series:   Which type of nuclear process occurs in steps a and b, respectively?

Accepted Answer

A) ($\alpha$ emission, $\alpha$emission) 
B) ($\alpha$ emission, $\beta$ emission) 
C) ($\beta$  emission, positron emission) 
D) ($\beta$  emission, $\alpha$ emission) 
E) (positron emission, $\beta$ emission) 
A) ($\alpha$ emission, $\alpha$emission) 
B) ($\alpha$ emission, $\beta$ emission) 
C) ($\beta$  emission, positron emission) 
D) ($\beta$  emission, $\alpha$ emission) 
E) (positron emission, $\beta$ emission)

Exam 19: Nuclear Chemistry

Balance the equation

Determine the decay rate for a radioisotope sample with an activity of 12 microcuries? [1 curie = 3.7 × 1010 disintegrations/s]

Carbon-11 is a radioactive isotope of carbon.Its half-life is 20.3 minutes.What fraction of the initial number of carbon-11 atoms in a sample will remain after 81 minutes?

Consider the following decay series: What type of nuclear process occurs at the transformation labeled I?

Cobalt-60 is a beta emitter with a half-life of 5.3 years.Approximately what fraction of cobalt-60 atoms will remain in a particular sample after 26.5 years?

On a neutron number versus proton number plot, the nucleus of oxygen-15 lies below the belt of stability.Write an equation for the radioactive decay of oxygen-15.

List the different types of nuclear radiation (alpha, beta, gamma)in order of increasing penetrating power.

Determine how much energy is released when polonium-210 decays according to .[Atomic masses: polonium-210 = 209.982857 amu; helium-4 = 4.002603 amu; lead-206 = 205.974449 amu]

Charcoal found under a stone at Stonehenge, England, has a carbon-14 activity that is 0.60 that of new wood.How old is the charcoal? (The half-life of carbon-14 is 5,730 years.)

The isotope of iodine with mass number 128 undergoes beta decay with a half-life of 25.00 minutes.Write a balanced nuclear reaction for this process.

What nuclear fuel is produced in a breeder reactor?

Complete and balance the nuclear equation

Decay of silicon-27 by positron emission yields

Describe the role of a moderator in a fission reactor, and give examples of two substances that are used as moderators.

Decay of lutetium-167 by electron capture yields

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, how many moles of tritium would be left after 78 years?

Predict which nucleus is less stable, or .

The carbon-14 activity of some ancient Indian corn was found to be 7.0 disintegrations per minute (dpm)per gram of carbon.If present-day plant life has 16 dpm per gram of carbon, how old is the Indian corn? (t1/2 = 5,730 yr)

Consider the following decay series: Which type of nuclear process occurs in steps a and b, respectively?

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

Determine the decay rate for a radioisotope sample with an activity of 12 microcuries? [1 curie = 3.7 × 10¹⁰disintegrations/s]

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, how many moles of tritium would be left after 78 years?

The carbon-14 activity of some ancient Indian corn was found to be 7.0 disintegrations per minute (dpm)per gram of carbon.If present-day plant life has 16 dpm per gram of carbon, how old is the Indian corn? (t_1/2 = 5,730 yr)