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

Balance the equation

Accepted Answer

The answer of Balance the equation  ...

Question 3

Which of the following represents a rule for balancing a nuclear equation? I.The total number of protons plus neutrons in the products and reactants must be the same
II.The total number of each type of element in the products and reactants must be the same
III.The total number of nuclear charges in the products and reactants must be the same
IV.The total number of each type of elementary particle in the products and reactants must be the same

Accepted Answer

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

Question 4

Consider the following decay series:   What is the symbol for the product labeled as Y?

Accepted Answer

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

Question 5

A sample of a radioisotope shows an activity of 999 disintegrations per minute due to beta decay.If after 1.10 years the activity is 952 disintegrations per minute, what is the half-life of this radioisotope?

Accepted Answer

A) 4.38 × 10-2 yr 
B) 11.4 yr 
C) 0.25 yr 
D) 15.8 yr 
E) 9.1 yr 
A) 4.38 × 10-2 yr 
B) 11.4 yr 
C) 0.25 yr 
D) 15.8 yr 
E) 9.1 yr

Question 6

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 7

When atoms of beryllium-9 are bombarded with alpha particles, neutrons are produced.What new isotope is also formed?   He +   Be     n + _____

Accepted Answer

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

Question 8

Decay of tin-110 by electron capture yields

Accepted Answer

A) tin-109. 
B) cadmium-106. 
C) indium-110. 
D) antimony-110. 
E) tellurium-114. 
A) tin-109. 
B) cadmium-106. 
C) indium-110. 
D) antimony-110. 
E) tellurium-114.

Question 9

List the number of protons, neutrons, and nucleons (protons + neutrons), in that order, for an isotope with the symbol:

Accepted Answer

A) 56, 81, 137 
B) 81, 56, 137 
C) 56, 137, 193 
D) 137, 56, 193 
E) 81, 137, 218 
A) 56, 81, 137 
B) 81, 56, 137 
C) 56, 137, 193 
D) 137, 56, 193 
E) 81, 137, 218

Question 10

A balanced nuclear equation representing the alpha emission of curium-242 is which of the following?

Accepted Answer

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

Question 11

Thorium-225 undergoes alpha decay.Write a balanced equation for this reaction.

Accepted Answer

The answer of Thorium-225 undergoes alpha decay.Write a balanced equation...

Question 12

The energy equivalent of a mass defect of - 0.1710 amu is which of the following?

Accepted Answer

A) - 5.130 x 107 J 
B) - 1.539 x 1016 J 
C) - 2.556 x 10-8 J 
D) - 2.556 x 10-11 J 
E) - 8.519 x 10-20 J 
A) - 5.130 x 107 J 
B) - 1.539 x 1016 J 
C) - 2.556 x 10-8 J 
D) - 2.556 x 10-11 J 
E) - 8.519 x 10-20 J

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

A plot of the number of neutrons versus the number of protons in various isotopes produces a "belt of stability." Isotopes below the belt of stability (i.e., with a smaller neutron-to-proton ratio)decay by beta particle emission.

Accepted Answer

A) True 
 B)False

Question 15

Consider the following decay series:   What is the symbol for the product labeled as Z?

Accepted Answer

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

Question 16

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 17

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 18

Strontium-90 has a half-life of 28.8 years.How much strontium-90 was present initially, if after 144 years 10.0 g remain?

Accepted Answer

The answer of Strontium-90 has a half-life of 28.8 years.How...

Question 19

Compare nuclear reactions with chemical reactions in terms of the conservation of mass.

Accepted Answer

As opposed to chemical reactio

Question 20

In passing through matter, alpha particles lose energy chiefly by causing

Accepted Answer

A) fermentation. 
B) neutralization. 
C) ionization. 
D) condensation. 
E) carbonation. 
A) fermentation. 
B) neutralization. 
C) ionization. 
D) condensation. 
E) carbonation.

Exam 19: Nuclear Chemistry

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

Balance the equation

Consider the following decay series: What is the symbol for the product labeled as Y?

A sample of a radioisotope shows an activity of 999 disintegrations per minute due to beta decay.If after 1.10 years the activity is 952 disintegrations per minute, what is the half-life of this radioisotope?

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

When atoms of beryllium-9 are bombarded with alpha particles, neutrons are produced.What new isotope is also formed? He + Be n + _____

Decay of tin-110 by electron capture yields

List the number of protons, neutrons, and nucleons (protons + neutrons), in that order, for an isotope with the symbol:

A balanced nuclear equation representing the alpha emission of curium-242 is which of the following?

Thorium-225 undergoes alpha decay.Write a balanced equation for this reaction.

The energy equivalent of a mass defect of - 0.1710 amu is which of the following?

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

A plot of the number of neutrons versus the number of protons in various isotopes produces a "belt of stability." Isotopes below the belt of stability (i.e., with a smaller neutron-to-proton ratio)decay by beta particle emission.

Consider the following decay series: What is the symbol for the product labeled as Z?

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

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.

Strontium-90 has a half-life of 28.8 years.How much strontium-90 was present initially, if after 144 years 10.0 g remain?

Compare nuclear reactions with chemical reactions in terms of the conservation of mass.

In passing through matter, alpha particles lose energy chiefly by causing

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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.