Question 1

Balance the equation   Fe +   H     Mn + ? .

Accepted Answer

The answer of Balance the equation   Fe +...

Question 2

Predict which nucleus is less stable,   or   .

Accepted Answer

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

Question 3

As a result of beta decay, the product nucleus is

Accepted Answer

A) one atomic number lower than the original element. 
B) two atomic numbers higher than the original element. 
C) one atomic number higher than the original element. 
D) two atomic numbers lower than the original element. 
E) four atomic numbers lower than the original element. 
A) one atomic number lower than the original element. 
B) two atomic numbers higher than the original element. 
C) one atomic number higher than the original element. 
D) two atomic numbers lower than the original element. 
E) four atomic numbers lower than the original element.

Question 4

Predict the other product of the following nuclear transformation.   Li +   n   ____ +   He

Accepted Answer

A)    He 
B)    H 
C)    H 
D)    $\beta$ 
E)    H 
A)    He 
B)    H 
C)    H 
D)    $\beta$ 
E)    H

Question 5

Radium-226 decays by alpha emission. What is its decay product?

Accepted Answer

A)    Fr 
B)    Rn 
C)    Th 
D)    Ac 
E)    Po 
A)    Fr 
B)    Rn 
C)    Th 
D)    Ac 
E)    Po

Question 6

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 7

In the following reaction, identify X.

Accepted Answer

A) 7$\beta$ 
B) 3$\alpha$ 
C) 4n 
D)    
E) 15p 
A) 7$\beta$ 
B) 3$\alpha$ 
C) 4n 
D)    
E) 15p

Question 8

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 9

The blood volume of a patient can be measured by using chromium-51, a positron emitter, administered as a solution of sodium chromate.Write the nuclear equation for the decay of chromium-51.

Accepted Answer

The answer of The blood volume of a patient can...

Question 10

When atoms of aluminum-27 are bombarded with alpha particles, a neutron and an element are produced. The particular isotope formed is   He +   Al     n + ____

Accepted Answer

A)    Si 
B)    Si 
C)    S 
D)    P 
E)    P 
A)    Si 
B)    Si 
C)    S 
D)    P 
E)    P

Question 11

The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 $\times$ 109 yr. A sample of moon rock was found to contain 78 argon-40 atoms for every 22 potassium-40 atoms. The age of the rock is

Accepted Answer

A) 8.1 $\times$ 10-10 yr 
B) 2.4 $\times$ 109 yr 
C) 2.8 $\times$ 109 yr 
D) 4.6 $\times$ 109 yr 
E) 6.8 $\times$ 109 yr 
A) 8.1 $\times$ 10-10 yr 
B) 2.4 $\times$ 109 yr 
C) 2.8 $\times$ 109 yr 
D) 4.6 $\times$ 109 yr 
E) 6.8 $\times$ 109 yr

Question 12

Tritium is a radioisotope of hydrogen having a half-life of 12.3 years.If you initially had 1.0 $\times$ 10-7 mole of tritium, calculate the decay rate of the sample.

Accepted Answer

1.08 @#LAT-DLM&10<su

Question 13

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 14

In the following reaction, identify X.

Accepted Answer

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

Question 15

Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in petroleum have been in the ground for 100 million years, what fraction of the initial 14C atoms is still there? (t1/2 = 5,370 yr)

Accepted Answer

A) 0 
B) 1 $\times$ 10-10 
C) 5.7 $\times$ 10-5 
D) 1.0 $\times$ 10-3 
E) 5.7 $\times$ 10-1 
A) 0 
B) 1 $\times$ 10-10 
C) 5.7 $\times$ 10-5 
D) 1.0 $\times$ 10-3 
E) 5.7 $\times$ 10-1

Question 16

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.

Question 17

What is the nuclear binding energy per nucleon, in joules, for   Mg (atomic mass 24.985839 amu). [Data:   H (atomic mass)= 1.007825 amu;   n (mass)= 1.008665 amu; 1 kg = 6.022 $\times$ 1026 amu; c = 3.00 $\times$ 108 m/s]

Accepted Answer

A) 0.22076 J/nucleon 
B) 3.30 $\times$ 10-11 J/nucleon 
C) 1.32 $\times$ 10-12 J/nucleon 
D) 0.999 J/nucleon 
E) None of the above. 
A) 0.22076 J/nucleon 
B) 3.30 $\times$ 10-11 J/nucleon 
C) 1.32 $\times$ 10-12 J/nucleon 
D) 0.999 J/nucleon 
E) None of the above.

Question 18

The half-life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175 years later?

Accepted Answer

A) 0.17 
B) 0.12 
C) 0.062 
D) 0.015 
E) 0.50 
A) 0.17 
B) 0.12 
C) 0.062 
D) 0.015 
E) 0.50

Question 19

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 20

Present-day plant life has a carbon-14 decay rate of 16 disintegrations per minute (dpm)per gram of carbon.If a contemporary wooden chair were somehow preserved for the next 3,900 years, what 14C decay rate should be expected from the wood used to make the chair? (t1/2 = 5,730 yr)

Accepted Answer

A) 26 dpm 
B) 12 dpm 
C) 11 dpm 
D) 10 dpm 
E) 8 dpm 
A) 26 dpm 
B) 12 dpm 
C) 11 dpm 
D) 10 dpm 
E) 8 dpm

Exam 23: Nuclear Chemistry

Balance the equation Fe + H Mn + ? .

Predict which nucleus is less stable, or .

As a result of beta decay, the product nucleus is

Predict the other product of the following nuclear transformation. Li + n ____ + He

Radium-226 decays by alpha emission. What is its decay product?

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

In the following reaction, identify X.

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?

The blood volume of a patient can be measured by using chromium-51, a positron emitter, administered as a solution of sodium chromate.Write the nuclear equation for the decay of chromium-51.

When atoms of aluminum-27 are bombarded with alpha particles, a neutron and an element are produced. The particular isotope formed is He + Al n + ____

The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 ×\times× 109 yr. A sample of moon rock was found to contain 78 argon-40 atoms for every 22 potassium-40 atoms. The age of the rock is

Tritium is a radioisotope of hydrogen having a half-life of 12.3 years.If you initially had 1.0 ×\times× 10-7 mole of tritium, calculate the decay rate of the sample.

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?

In the following reaction, identify X.

Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in petroleum have been in the ground for 100 million years, what fraction of the initial 14C atoms is still there? (t1/2 = 5,370 yr)

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

What is the nuclear binding energy per nucleon, in joules, for Mg (atomic mass 24.985839 amu). [Data: H (atomic mass)= 1.007825 amu; n (mass)= 1.008665 amu; 1 kg = 6.022 ×\times× 1026 amu; c = 3.00 ×\times× 108 m/s]

The half-life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175 years later?

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

Present-day plant life has a carbon-14 decay rate of 16 disintegrations per minute (dpm)per gram of carbon.If a contemporary wooden chair were somehow preserved for the next 3,900 years, what 14C decay rate should be expected from the wood used to make the chair? (t1/2 = 5,730 yr)

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The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 $\times$ 10⁹ yr. A sample of moon rock was found to contain 78 argon-40 atoms for every 22 potassium-40 atoms. The age of the rock is

Tritium is a radioisotope of hydrogen having a half-life of 12.3 years.If you initially had 1.0 $\times$ 10^-7 mole of tritium, calculate the decay rate of the sample.

Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in petroleum have been in the ground for 100 million years, what fraction of the initial ¹⁴C atoms is still there? (t_1/2 = 5,370 yr)

The half-life of ⁹⁰Sr is 29 years. What fraction of the atoms in a sample of ⁹⁰Sr would remain 175 years later?

Present-day plant life has a carbon-14 decay rate of 16 disintegrations per minute (dpm)per gram of carbon.If a contemporary wooden chair were somehow preserved for the next 3,900 years, what ¹⁴C decay rate should be expected from the wood used to make the chair? (t_1/2= 5,730 yr)