Question 1

If 12% of a certain radioisotope decays in 5.2 years, what is the half-life of this isotope?

Accepted Answer

A) 0.59 yr 
B) 1.7 yr 
C) 22 yr 
D) 28 yr 
E) 32 yr 
A) 0.59 yr 
B) 1.7 yr 
C) 22 yr 
D) 28 yr 
E) 32 yr

Question 2

Complete and balance the nuclear equation   .

Accepted Answer

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

Question 3

How old is a bottle of wine if the tritium (3H)content is 25% that of a new wine? The half-life of tritium is 12.5 years.

Accepted Answer

A) 0.25 yr 
B) 3.1 yr 
C) 25 yr 
D) 38 yr 
E) 50. yr 
A) 0.25 yr 
B) 3.1 yr 
C) 25 yr 
D) 38 yr 
E) 50. yr

Question 4

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 5

Beta 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 6

What element is the stable end-product of the uranium radioactive decay series?

Accepted Answer

A) Th 
B) Pu 
C) Ra 
D) Au 
E) Pb 
A) Th 
B) Pu 
C) Ra 
D) Au 
E) Pb

Question 7

Which of the following is an advantage of nuclear power plants over coal-burning plants? Nuclear power plants

Accepted Answer

A) produce radioactive byproducts with very short half-lives, reducing the need for waste storage. 
B) do not pollute the air with SO2, soot, and fly-ash. 
C) create no thermal pollution. 
D) generate radioactive byproducts that can be sold for use in secondary applications. 
A) produce radioactive byproducts with very short half-lives, reducing the need for waste storage. 
B) do not pollute the air with SO2, soot, and fly-ash. 
C) create no thermal pollution. 
D) generate radioactive byproducts that can be sold for use in secondary applications.

Question 8

Which isotope, when bombarded with nitrogen-15, yields the artificial isotope dubnium-260 plus 4 neutrons?

Accepted Answer

A) californium-245 
B) thorium-257 
C) nobelium-245 
D) californium-249 
E) dubnium-249 
A) californium-245 
B) thorium-257 
C) nobelium-245 
D) californium-249 
E) dubnium-249

Question 9

What is the missing symbol in this plutonium fission reaction?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 10

Balance the equation   .

Accepted Answer

The answer of Balance the equation   ....

Question 11

On a plot of the number of neutrons versus the number of protons, a nucleus of aluminum-28 lies above the belt of stability. Write an equation for radioactive decay of aluminum-28.

Accepted Answer

The answer of On a plot of the number of...

Question 12

Complete and balance the nuclear equation   .

Accepted Answer

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

Question 13

What role does cadmium metal (Cd)play in a nuclear reactor?

Accepted Answer

A) slows down the fission neutrons (moderator) 
B) transfers heat from the reactor to the heat exchanger (primary coolant) 
C) controls chain reaction (control rods) 
D) transfers heat from the condenser to the environment (cooling tower) 
E) undergoes fission (fuel rods) 
A) slows down the fission neutrons (moderator) 
B) transfers heat from the reactor to the heat exchanger (primary coolant) 
C) controls chain reaction (control rods) 
D) transfers heat from the condenser to the environment (cooling tower) 
E) undergoes fission (fuel rods)

Question 14

Which is the most penetrating of the three types of nuclear radiation?

Accepted Answer

A) alpha 
B) beta 
C) gamma 
A) alpha 
B) beta 
C) gamma

Question 15

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 16

The 14C activity of some ancient Peruvian corn was found to be 10 disintegrations per minute per gram of carbon. If present-day plant life shows 15 dpm/g, how old is the Peruvian corn? The half-life of 14C is 5730 yr.

Accepted Answer

A) 1,455 yr 
B) 1,910 yr 
C) 3,350 yr 
D) 3,820 yr 
E) 9,080 yr 
A) 1,455 yr 
B) 1,910 yr 
C) 3,350 yr 
D) 3,820 yr 
E) 9,080 yr

Question 17

Cobalt-60 is a beta emitter with a half-life of 5.3 years. Approximately what fraction of the cobalt-60 atoms in a particular sample will remain after 32 years?

Accepted Answer

A) 1/6 
B) 1/8 
C) 1/16 
D) 1/32 
E) 1/64 
A) 1/6 
B) 1/8 
C) 1/16 
D) 1/32 
E) 1/64

Question 18

In the   decay series there are six radioisotopes that decay by alpha emission, including Th-232 itself, and four radioisotopes that decay by beta emission. The final product of this series is a stable isotope. The symbol for this product is

Accepted Answer

A)    . 
B)    . 
C)    . 
D)    . 
E)    . 
A)    . 
B)    . 
C)    . 
D)    . 
E)    .

Question 19

The mass of a nucleus is always less than the sum of the masses of the nucleons.

Accepted Answer

A) True 
 B)False

Question 20

Protactinium-234 has a half-life of 1 minute. How much of a 400. g sample protactinium would remain after 4 minutes?

Accepted Answer

The answer of Protactinium-234 has a half-life of 1 minute....

Exam 21: Nuclear Chemistry

If 12% of a certain radioisotope decays in 5.2 years, what is the half-life of this isotope?

Complete and balance the nuclear equation .

How old is a bottle of wine if the tritium (3H)content is 25% that of a new wine? The half-life of tritium is 12.5 years.

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

Beta particles are identical to

What element is the stable end-product of the uranium radioactive decay series?

Which of the following is an advantage of nuclear power plants over coal-burning plants? Nuclear power plants

Which isotope, when bombarded with nitrogen-15, yields the artificial isotope dubnium-260 plus 4 neutrons?

What is the missing symbol in this plutonium fission reaction?

Balance the equation .

On a plot of the number of neutrons versus the number of protons, a nucleus of aluminum-28 lies above the belt of stability. Write an equation for radioactive decay of aluminum-28.

Complete and balance the nuclear equation .

What role does cadmium metal (Cd)play in a nuclear reactor?

Which is the most penetrating of the three types of nuclear radiation?

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.

The 14C activity of some ancient Peruvian corn was found to be 10 disintegrations per minute per gram of carbon. If present-day plant life shows 15 dpm/g, how old is the Peruvian corn? The half-life of 14C is 5730 yr.

Cobalt-60 is a beta emitter with a half-life of 5.3 years. Approximately what fraction of the cobalt-60 atoms in a particular sample will remain after 32 years?

In the decay series there are six radioisotopes that decay by alpha emission, including Th-232 itself, and four radioisotopes that decay by beta emission. The final product of this series is a stable isotope. The symbol for this product is

The mass of a nucleus is always less than the sum of the masses of the nucleons.

Protactinium-234 has a half-life of 1 minute. How much of a 400. g sample protactinium would remain after 4 minutes?

Introduction

Atoms, Molecules, and Ions

Stoichiometry

Reactions in Aqueous Solution

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Organic Polymerssynthetic and Natural

Filters

How old is a bottle of wine if the tritium (³H)content is 25% that of a new wine? The half-life of tritium is 12.5 years.

The ¹⁴C activity of some ancient Peruvian corn was found to be 10 disintegrations per minute per gram of carbon. If present-day plant life shows 15 dpm/g, how old is the Peruvian corn? The half-life of ¹⁴C is 5730 yr.