Question 1

Calculate the energy released in joules when one mole of polonium-214 decays according to the equation  84214Po→82210 Pb+24He.{ }_{84}^{214} \mathrm{Po} \rightarrow{ }_{82}^{210} \mathrm{~Pb}+{ }_{2}^{4} \mathrm{He} .84214​Po→82210​ Pb+24​He.  [Atomic masses: Pb-210 = 209.98284 amu, Po-214 = 213.99519 amu, He-4 = 4.00260 amu.]

Accepted Answer

A)   8.78 * 1014 J/mol
B)   7.2 * 1014 J/mol
C)   8.78 * 1011 J/mol
D)   -9.75 * 10-3 J/mol
E)   1.46 * 10-9 J/mol F) A) and B)
G) A) and C)

Question 2

Balance the equation  86222Rn→24He+?{ }_{86}^{222} \mathrm{Rn} \rightarrow{ }_{2}^{4} \mathrm{He}+?86222​Rn→24​He+?

Accepted Answer

A)    84218Po{ }_{84}^{218} \mathrm{Po}84218​Po 
B)    88218Ra{ }_{88}^{218} \mathrm{Ra}88218​Ra 
C)    84226Po{ }_{84}^{226} \mathrm{Po}84226​Po 
D)    84226Ra{ }_{84}^{226} R a84226​Ra 
E)   None of the above F) B) and C)
G) None of the above

Question 3

The carbon-14 activity of some ancient Indian corn was found to be 7.0 disintegrations per minute (dpm)  per gram of carbon. If present-day plant life has 16 dpm per gram of carbon, how old is the Indian corn? (t1/2 = 5,730 yr)

Accepted Answer

A)   6,800 yr
B)   2,500 yr
C)   4,700 yr
D)   10,000 yr
E)   7,200 yrF) All of the above
G) B) and D)

Question 4

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 yrF) C) and D)
G) A) and C)

Question 5

The only stable isotope of iodine is iodine-127. Predict the mode of decay of  53130I{ }_{53}^{130} \mathrm{I}53130​I

Accepted Answer

A)   alpha emission
B)   beta emission
C)   positron emission
D)   electron capture E) All of the above
F) A) and B)

Question 6

Calcium-45 is more stable than calcium-44.

Accepted Answer

A) True 
 B)False

Question 7

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)   1/64F) B) and C)
G) B) and E)

Question 8

Which of the following nuclear processes does not change the mass number in the product element formed
I. Alpha emission
II. Beta emission
III. Positron emission
IV. Electron capture

Accepted Answer

A)   I and II
B)   III and IV
C)   I, II, and III
D)   II, III, and IV
E)   IV onlyF) All of the above
G) A) and B)

Question 9

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

Accepted Answer

A)    96242Cm+24He⟶94246Pu{ }_{96}^{242} \mathrm{Cm}+{ }_{2}^{4} \mathrm{He} \longrightarrow{ }_{94}^{246} \mathrm{Pu}96242​Cm+24​He⟶94246​Pu 
B)    96242Cm⟶98246Cf+24He{ }_{96}^{242} \mathrm{Cm} \longrightarrow{ }_{98}^{246} \mathrm{Cf}+{ }_{2}^{4} \mathrm{He}96242​Cm⟶98246​Cf+24​He 
C)    96242Cm⟶94238Pu+24He{ }_{96}^{242} \mathrm{Cm} \longrightarrow{ }_{94}^{238} \mathrm{Pu}+{ }_{2}^{4} \mathrm{He}96242​Cm⟶94238​Pu+24​He 
D)    96242Cm+24He⟶98246Cf{ }_{96}^{242} \mathrm{Cm}+{ }_{2}^{4} \mathrm{He} \longrightarrow{ }_{98}^{246} \mathrm{Cf}96242​Cm+24​He⟶98246​Cf 
E)    96242Cm⟶97242Bk+−10α{ }_{96}^{242} \mathrm{Cm} \longrightarrow{ }_{97}^{242} \mathrm{Bk}+{ }_{-1}^{0} \alpha96242​Cm⟶97242​Bk+−10​αF) B) and C)
G) B) and E)

Question 10

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 JF) A) and D)
G) A) and C)

Question 11

The half-life of 14C is 5,730 yr. Assuming some charcoal from a campfire 29,000 years old was found, what fraction of the original C-14 would remain today

Accepted Answer

A)   3.0 * 10-2
B)   0.197
C)   3.51
D)   33.3
E)   None of these.F) A) and B)
G) All of the above

Question 12

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

Accepted Answer

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

Question 13

The isotope of iodine with mass number 128 undergoes beta decay with a half-life of 25.00 minutes. How long will it take for 93.75% of a sample of pure 128 I to decay

Accepted Answer

A)   60.0 min
B)   80.0 min
C)   100. min
D)   120. min
E)   None of the aboveF) All of the above
G) B) and E)

Question 14

Which of the following nuclear processes results in an increase in the number of neutrons in the product element
I. Alpha emission
II. Beta emission
III. Positron emission
IV. Electron capture

Accepted Answer

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

Question 15

The isotope of iodine with mass number 128 undergoes beta decay with a half-life of 25.00 minutes. The balanced nuclear reaction for this process is: ${ }_{53}^{128} I \rightarrow{ }_{52}^{128} \mathrm{Te}+{ }_{-1}^{0} \beta$

Accepted Answer

A) True 
 B)False

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-249F) B) and E)
G) A) and B)

Question 17

1 joule equals

Accepted Answer

A)   1 kg m
B)   1 g m2 s2
C)   1 kg m2/s
D)   1 g m2/s
E)   1 kg m2/s2F) None of the above
G) B) and D)

Question 18

In the following reaction, identify X.  510 B(X,α) 37Li{ }_{5}^{10} \mathrm{~B}(\mathrm{X}, \alpha) { }_{3}^{7} \mathrm{Li}510​ B(X,α) 37​Li

Accepted Answer

A)   a
B)   n
C)   p
D)    +1   0^{~~~0}_{+1}+1   0​ e
E)   b F) D) and E)
G) C) and E)

Question 19

As a result of alpha emission, 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.F) A) and C)
G) A) and D)

Question 20

Which of the following nuclear processes results in an increase of atomic number in the product element formed
I. Alpha emission
II. Beta emission
III. Positron emission
IV. Electron capture

Accepted Answer

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

Exam 19: Nuclear Chemistry

In the following reaction, identify X. 510 B(X,α) 37Li{ }_{5}^{10} \mathrm{~B}(\mathrm{X}, \alpha) { }_{3}^{7} \mathrm{Li}510​ B(X,α) 37​Li

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Calcium-45 is more stable than calcium-44.

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1 joule equals

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The only stable isotope of iodine is iodine-127. Predict the mode of decay of 53130I{ }_{53}^{130} \mathrm{I}53130​I

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As a result of alpha emission, the product nucleus is

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The carbon-14 activity of some ancient Indian corn was found to be 7.0 disintegrations per minute (dpm) per gram of carbon. If present-day plant life has 16 dpm per gram of carbon, how old is the Indian corn? (t1/2 = 5,730 yr)

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

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Which of the following nuclear processes results in an increase of atomic number in the product element formed I. Alpha emission II. Beta emission III. Positron emission IV. Electron capture

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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

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The half-life of 14C is 5,730 yr. Assuming some charcoal from a campfire 29,000 years old was found, what fraction of the original C-14 would remain today

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

Correct AnswerverifiedShow Answer

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

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The isotope of iodine with mass number 128 undergoes beta decay with a half-life of 25.00 minutes. How long will it take for 93.75% of a sample of pure 128 I to decay

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Which of the following nuclear processes results in an increase in the number of neutrons in the product element I. Alpha emission II. Beta emission III. Positron emission IV. Electron capture

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

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

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Balance the equation 86222Rn→24He+?{ }_{86}^{222} \mathrm{Rn} \rightarrow{ }_{2}^{4} \mathrm{He}+?86222​Rn→24​He+?

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The isotope of iodine with mass number 128 undergoes beta decay with a half-life of 25.00 minutes. The balanced nuclear reaction for this process is: 53128I→52128Te+−10β{ }_{53}^{128} I \rightarrow{ }_{52}^{128} \mathrm{Te}+{ }_{-1}^{0} \beta53128​I→52128​Te+−10​β

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Which of the following nuclear processes does not change the mass number in the product element formed I. Alpha emission II. Beta emission III. Positron emission IV. Electron capture

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In the following reaction, identify X. ${ }_{5}^{10} \mathrm{~B}(\mathrm{X}, \alpha) { }_{3}^{7} \mathrm{Li}$

Correct Answer
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The only stable isotope of iodine is iodine-127. Predict the mode of decay of ${ }_{53}^{130} \mathrm{I}$

Correct Answer
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Correct Answer
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The carbon-14 activity of some ancient Indian corn was found to be 7.0 disintegrations per minute (dpm) per gram of carbon. If present-day plant life has 16 dpm per gram of carbon, how old is the Indian corn? (t_1/2 = 5,730 yr)

Correct Answer
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Correct Answer
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The half-life of ¹⁴C is 5,730 yr. Assuming some charcoal from a campfire 29,000 years old was found, what fraction of the original C-14 would remain today

Correct Answer
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Correct Answer
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Correct Answer
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The isotope of iodine with mass number 128 undergoes beta decay with a half-life of 25.00 minutes. How long will it take for 93.75% of a sample of pure ¹²⁸ I to decay

Correct Answer
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Correct Answer
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Balance the equation ${ }_{86}^{222} \mathrm{Rn} \rightarrow{ }_{2}^{4} \mathrm{He}+?$

Correct Answer
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The isotope of iodine with mass number 128 undergoes beta decay with a half-life of 25.00 minutes. The balanced nuclear reaction for this process is: ${ }_{53}^{128} I \rightarrow{ }_{52}^{128} \mathrm{Te}+{ }_{-1}^{0} \beta$

Correct Answer
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Correct Answer
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