Question 1

A certain isotope has a specific activity of 7.29 × 10-4 Ci/g. How many F1F1F1S1F1F1F10 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 the above 
A)  9.99 × 104 
B)  2.02 × 106 
C)  7.28 × 109 
D)  1.29 × 1012 
E)  none of the above

Question 2

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

A)    
B)    
C)    
D)    
E)  none of the above 
A)    
B)    
C)    
D)    
E)  none of the above

Question 3

The radioisotope   will decay through

Accepted Answer

A)  .F1F1F1S1F1F1F10 decay. 
B)  .F1F1F1S1F1F1F10 decay. 
C)  .F1F1F1S1F1F1F10 decay. 
D)  positron decay. 
E)  electron capture. 
A)  .F1F1F1S1F1F1F10 decay. 
B)  .F1F1F1S1F1F1F10 decay. 
C)  .F1F1F1S1F1F1F10 decay. 
D)  positron decay. 
E)  electron capture.

Question 4

The (negative) binding energy per nucleon reaches a maximum for the isotope   .

Accepted Answer

A) True 
 B)False

Question 5

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 6

Which one of the following is an incorrect representation of the indicated particle or nucleus?

Accepted Answer

A)  positron:   
B)  neutron:   
C)  helium-3:   
D)  alpha particle:   
E)  proton:   
A)  positron:   
B)  neutron:   
C)  helium-3:   
D)  alpha particle:   
E)  proton:

Question 7

Fill in missing sub- and superscripts for all particles to complete the following equation for positron decay.

Accepted Answer

The answer of Fill in missing sub- and superscripts for...

Question 8

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 the above 
A)  32 amu 
B)  16 amu 
C)  8 amu 
D)  4 amu 
E)  none of the above

Question 9

The isotope   is unstable. This is predictable because

Accepted Answer

A)  the number of neutrons is too large in relation to the number of protons. 
B)  the number of neutrons is too small in relation to the number of protons. 
C)  the atomic number is too large. 
D)  the mass number is too large. 
E)  Sc isotopes are all unstable. 
A)  the number of neutrons is too large in relation to the number of protons. 
B)  the number of neutrons is too small in relation to the number of protons. 
C)  the atomic number is too large. 
D)  the mass number is too large. 
E)  Sc isotopes are all unstable.

Question 10

Which of the following types of radioactive decay does not produce new element?

Accepted Answer

A)  gamma emission 
B)  electron capture 
C)  beta emission 
D)  alpha emission 
E)  double beta emission 
A)  gamma emission 
B)  electron capture 
C)  beta emission 
D)  alpha emission 
E)  double beta emission

Question 11

A 7.85 × 10-5 mol sample of copper-61 emits 1.47 × 1019 positrons in 90.0 minutes. What is the decay constant for copper-61?

Accepted Answer

A)  0.00230 h-1 
B)  0.00346 h-1 
C)  0.207 h-1 
D)  0.311 h-1 
E)  none of the above 
A)  0.00230 h-1 
B)  0.00346 h-1 
C)  0.207 h-1 
D)  0.311 h-1 
E)  none of the above

Question 12

An isotope with a low value of N/Z will generally decay through

Accepted Answer

A)  .F1F1F1S1F1F1F10 decay. 
B)  .F1F1F1S1F1F1F10 decay. 
C)  .F1F1F1S1F1F1F10 decay. 
D)  electron capture. 
E)  spontaneous fission. 
A)  .F1F1F1S1F1F1F10 decay. 
B)  .F1F1F1S1F1F1F10 decay. 
C)  .F1F1F1S1F1F1F10 decay. 
D)  electron capture. 
E)  spontaneous fission.

Question 13

Carbon-14 will emit a F1F1F1S1F1F1F10 particle with an energy of 0.1565 MeV. What is this energy in joules?

Accepted Answer

A)  1.0 × 10-24 J 
B)  2.5 × 10-20 J 
C)  1.0 × 10-18 J 
D)  2.5 × 10-14 J 
E)  none of the above 
A)  1.0 × 10-24 J 
B)  2.5 × 10-20 J 
C)  1.0 × 10-18 J 
D)  2.5 × 10-14 J 
E)  none of the above

Question 14

The isotope   is unstable. This is predictable because

Accepted Answer

A)  N/Z F1F1F1S1F1F1F10 1. 
B)  N/Z is relatively low and Z < 20. 
C)  N/Z is relatively large and Z < 20. 
D)  Z is small. 
E)  N is large. 
A)  N/Z F1F1F1S1F1F1F10 1. 
B)  N/Z is relatively low and Z < 20. 
C)  N/Z is relatively large and Z < 20. 
D)  Z is small. 
E)  N is large.

Question 15

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

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

Question 16

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

A)    
B)    
C)    
D)    
E)  none of the above 
A)    
B)    
C)    
D)    
E)  none of the above

Question 17

Select the nuclide that completes the following nuclear reaction.

Accepted Answer

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

Question 18

A N-14 nucleus is hit by a particle, forming a C-14 nucleus and a proton as the only products. Identify the type of particle which struck the N-14 nucleus.

Accepted Answer

A)  alpha 
B)  proton 
C)  electron 
D)  neutron 
E)  deuterium 
A)  alpha 
B)  proton 
C)  electron 
D)  neutron 
E)  deuterium

Question 19

Iodine-131, t1/2 = 8.0 days, is used in diagnosis and treatment of thyroid gland diseases. If a laboratory sample of iodine-131 initially emits 9.95 × 1018 F1F1F1S1F1F1F10 particles per day, how long will it take for the activity to drop to 6.22 × 1017 F1F1F1S1F1F1F10 particles per day?

Accepted Answer

A)  2.0 days 
B)  16 days 
C)  32 days 
D)  128 days 
E)  none of the above 
A)  2.0 days 
B)  16 days 
C)  32 days 
D)  128 days 
E)  none of the above

Question 20

An isotope with Z > 83, which lies close to the band of stability, will generally decay through

Accepted Answer

A)  .F1F1F1S1F1F1F10 decay. 
B)  .F1F1F1S1F1F1F10 decay. 
C)  .F1F1F1S1F1F1F10 decay. 
D)  positron decay. 
E)  electron capture. 
A)  .F1F1F1S1F1F1F10 decay. 
B)  .F1F1F1S1F1F1F10 decay. 
C)  .F1F1F1S1F1F1F10 decay. 
D)  positron decay. 
E)  electron capture.

Exam 24: Nuclear Reactions and Their Applications

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

Select the nuclide that completes the following nuclear reaction.

The radioisotope will decay through

The (negative) binding energy per nucleon reaches a maximum for the isotope .

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?

Which one of the following is an incorrect representation of the indicated particle or nucleus?

Fill in missing sub- and superscripts for all particles to complete the following equation for positron decay.

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?

The isotope is unstable. This is predictable because

Which of the following types of radioactive decay does not produce new element?

A 7.85 × 10-5 mol sample of copper-61 emits 1.47 × 1019 positrons in 90.0 minutes. What is the decay constant for copper-61?

An isotope with a low value of N/Z will generally decay through

Carbon-14 will emit a  particle with an energy of 0.1565 MeV. What is this energy in joules?

The isotope is unstable. This is predictable because

Select the nuclide that completes the following nuclear reaction.

Select the nuclide that completes the following nuclear reaction.

Select the nuclide that completes the following nuclear reaction.

A N-14 nucleus is hit by a particle, forming a C-14 nucleus and a proton as the only products. Identify the type of particle which struck the N-14 nucleus.

Iodine-131, t1/2 = 8.0 days, is used in diagnosis and treatment of thyroid gland diseases. If a laboratory sample of iodine-131 initially emits 9.95 × 1018  particles per day, how long will it take for the activity to drop to 6.22 × 1017  particles per day?

An isotope with Z > 83, which lies close to the band of stability, will generally decay through

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

The 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: Bonding, Structure, and Reactivity

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 the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Filters

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

All the disintegrations of a sample of an unknown nuclide weighing 4.6 × 10^-2g 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 7.85 × 10^-5 mol sample of copper-61 emits 1.47 × 10¹⁹ positrons in 90.0 minutes. What is the decay constant for copper-61?

Iodine-131, t_1/2 = 8.0 days, is used in diagnosis and treatment of thyroid gland diseases. If a laboratory sample of iodine-131 initially emits 9.95 × 10¹⁸  particles per day, how long will it take for the activity to drop to 6.22 × 10¹⁷  particles per day?