Question 1

Which one of the following equations correctly represents alpha decay of   ?

Accepted Answer

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

Question 2

The isotopes of promethium,   and      are unstable, and lie on opposite sides of the "line of stability". Which of the following combinations is most likely to represent the type of decay for these isotopes?

Accepted Answer

A)  promethium-144, β decay; promethium-134, positron decay 
B)  promethium-144, positron decay; promethium-134, β decay 
C)  promethium-144, positron decay; promethium-134, electron capture 
D)  promethium-144, electron capture; promethium-134, positron decay 
E)  promethium-144, β decay; promethium-134,   decay 
A)  promethium-144, β decay; promethium-134, positron decay 
B)  promethium-144, positron decay; promethium-134, β decay 
C)  promethium-144, positron decay; promethium-134, electron capture 
D)  promethium-144, electron capture; promethium-134, positron decay 
E)  promethium-144, β decay; promethium-134,   decay A

Question 3

Which one of the following equations correctly represents positron decay of   ?

Accepted Answer

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

Question 4

Gamma rays are high energy electrons.

Accepted Answer

A) True 
 B)False

Question 5

No alpha decay is observed for isotopes of elements with Z < 83.

Accepted Answer

A) True 
 B)False

Question 6

An alkaline earth element is radioactive. It and its daughter elements decay by emitting a total of three alpha particles in succession. In what group of the periodic table is the element resulting from the emission of the third alpha particle?

Accepted Answer

A)  4A (14) 
B)  5A (15) 
C)  6A (16) 
D)  7A (17) 
E)  8A (18) 
A)  4A (14) 
B)  5A (15) 
C)  6A (16) 
D)  7A (17) 
E)  8A (18)

Question 7

The radioisotope   will decay through

Accepted Answer

A)  α decay. 
B)  β decay. 
C)  positron decay. 
D)  electron capture. 
E)    decay. 
A)  α decay. 
B)  β decay. 
C)  positron decay. 
D)  electron capture. 
E)    decay.

Question 8

Most foodstuffs contain natural, radioactive isotopes.

Accepted Answer

A) True 
 B)False

Question 9

Cesium-134 is a β emitter with a half-life of 2.0 years. How much of a 2.50-g sample of cesium-134 will remain after 10 years?

Accepted Answer

A)  0.0024 g 
B)  0.078 g 
C)  0.25 g 
D)  0.50 g 
E)  None of these choices are correct. 
A)  0.0024 g 
B)  0.078 g 
C)  0.25 g 
D)  0.50 g 
E)  None of these choices are correct.

Question 10

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

A)    
B)    
C)    
D)    
E)  None of these choices are correct. 
A)    
B)    
C)    
D)    
E)  None of these choices are correct.

Question 11

The isotope   has a half-life of 7.5 seconds. If a sample contains 144 atoms of   approximately how many such atoms were there present 30 seconds earlier?

Accepted Answer

A)  576 
B)  1152 
C)  2304 
D)  4320 
E)  4.30 × 108 
A)  576 
B)  1152 
C)  2304 
D)  4320 
E)  4.30 × 108

Question 12

After 4 half-lives, the fraction of a radioactive isotope which still remains is approximately one-eighth.

Accepted Answer

A) True 
 B)False

Question 13

The r-process occurs during supernova explosions.

Accepted Answer

A) True 
 B)False

Question 14

All the disintegrations of a sample of an unknown nuclide weighing 4.6 × 10-2 g were counted. In the first half-life of the sample, the total number of disintegrations counted was 4.3 × 1020. What is the atomic weight of the unknown element?

Accepted Answer

A)  32 amu 
B)  16 amu 
C)  8 amu 
D)  4 amu 
E)  None of these choices are correct. 
A)  32 amu 
B)  16 amu 
C)  8 amu 
D)  4 amu 
E)  None of these choices are correct.

Question 15

Which of the following isotopes is most likely to be unstable?

Accepted Answer

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

Question 16

A certain isotope has a specific activity of 7.29 × 10-4 Ci/g. How many α particles will a 75.0 mg sample emit in one hour?

Accepted Answer

A)  9.99 × 104 
B)  2.02 × 106 
C)  7.28 × 109 
D)  1.29 × 1012 
E)  None of these choices are correct. 
A)  9.99 × 104 
B)  2.02 × 106 
C)  7.28 × 109 
D)  1.29 × 1012 
E)  None of these choices are correct.

Question 17

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

A)   
B)    
C)    
D)    
E)  None of these choices are correct. 
A)   
B)    
C)    
D)    
E)  None of these choices are correct.

Question 18

The s-process involves a slow succession of neutron absorption and beta decay processes during the normal life of a star.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following isotopes is most likely to be unstable?

Accepted Answer

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

Question 20

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

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

Exam 24: Nuclear Reactions and Their Applications

Which one of the following equations correctly represents alpha decay of ?

The isotopes of promethium, and are unstable, and lie on opposite sides of the "line of stability". Which of the following combinations is most likely to represent the type of decay for these isotopes?

Which one of the following equations correctly represents positron decay of ?

Gamma rays are high energy electrons.

No alpha decay is observed for isotopes of elements with Z < 83.

An alkaline earth element is radioactive. It and its daughter elements decay by emitting a total of three alpha particles in succession. In what group of the periodic table is the element resulting from the emission of the third alpha particle?

The radioisotope will decay through

Most foodstuffs contain natural, radioactive isotopes.

Cesium-134 is a β emitter with a half-life of 2.0 years. How much of a 2.50-g sample of cesium-134 will remain after 10 years?

Select the nuclide that completes the following nuclear reaction.

The isotope has a half-life of 7.5 seconds. If a sample contains 144 atoms of approximately how many such atoms were there present 30 seconds earlier?

After 4 half-lives, the fraction of a radioactive isotope which still remains is approximately one-eighth.

The r-process occurs during supernova explosions.

All the disintegrations of a sample of an unknown nuclide weighing 4.6 × 10-2 g were counted. In the first half-life of the sample, the total number of disintegrations counted was 4.3 × 1020. What is the atomic weight of the unknown element?

Which of the following isotopes is most likely to be unstable?

A certain isotope has a specific activity of 7.29 × 10-4 Ci/g. How many α particles will a 75.0 mg sample emit in one hour?

Select the nuclide that completes the following nuclear reaction.

The s-process involves a slow succession of neutron absorption and beta decay processes during the normal life of a star.

Which of the following isotopes is most likely to be unstable?

Select the nuclide that completes the following nuclear reaction.

Keys to Studying Chemistry Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces Liquids, Solids, and Phase Changes

The Properties of Mixtures Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics Rates and Mechanisms of Chemical Reactions

Equilibrium the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics Entropy, Free Energy, and Reaction Direction

Electrochemistry Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Filters

All the disintegrations of a sample of an unknown nuclide weighing 4.6 × 10^-2 g were counted. In the first half-life of the sample, the total number of disintegrations counted was 4.3 × 10²⁰. What is the atomic weight of the unknown element?

A certain isotope has a specific activity of 7.29 × 10^-4 Ci/g. How many α particles will a 75.0 mg sample emit in one hour?