Question 1

Identify the missing species in the following nuclear transmutation. U-238 + ? → 1 neutron + Fm-249

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) None of the above
G) D) and E) D

Question 2

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

Accepted Answer

A)  Californium-245
B)  Thorium-257
C)  Nobelium-245
D)  Californium-249
E)  Dubnium-249F) A) and E)
G) A) and C)

Question 3

The dose unit of ionizing radiation is called the rad.The rad is defined in terms of

Accepted Answer

A)  the half-life of a radioisotope.
B)  the energy deposited per gram of an object.
C)  the biological damage produced.
D)  the accumulation of fission products.
E)  the number of ions per centimeter.F) None of the above
G) A) and E) B

Question 4

A gamma particle has a charge of -1.

Accepted Answer

A) True 
 B)False

Question 5

A particle accelerator uses which of the following to increase the kinetic energy of charged species so that a reaction will occur?

Accepted Answer

A)  Electromagnetic fields
B)  Fission reaction
C)  Gravitational field
D)  Fusion reaction
E)  Combustion reactionF) A) and D)
G) All of the above

Question 6

Calculate the energy released in joules when one mole of polonium-214 decays according to the following equation. 26 amu; NA = 6.022 × 1023 mol-1; C = 2.99792458 × 108 m/s)  A) 8.78 × 1014 J/mol B) 7.2 × 1014 J/mol C) 8.76 × 1011 J/mol D) -9.75 × 10-3 J/mol E) 1.46 × 10-9 J/mol" class="answers-bank-image d-inline" rel="preload" > Particle Mass (amu) 
Pb-210
209) 98284
Po-214
213) 99519
He-4
4) 00260
(1 kg = 6.022 × 1026 amu;
NA = 6.022 × 1023 mol-1;
C = 2.99792458 × 108 m/s)

Accepted Answer

A)  8.78 × 1014 J/mol
B)  7.2 × 1014 J/mol
C)  8.76 × 1011 J/mol
D)  -9.75 × 10-3 J/mol
E)  1.46 × 10-9 J/molF) All of the above
G) A) and C)

Question 7

Nuclei with an _____ number of protons and an _____ number of neutrons tend to be more stable than those with an _____ number of protons and/or an _____ number of neutrons.

Accepted Answer

A)  even; odd; odd; even
B)  even; even; odd; odd
C)  odd; odd; even; even
D)  odd; even; even; odd
E)  odd; odd; even; oddF) A) and C)
G) B) and E)

Question 8

In the following diagrams,A represents a radioactive isotope that decays into a new isotope,X.Each circle represents 1 mmol of atoms. t = 0:  t = 25.0 s:  Which diagram best represents the sample at t = 50.0 s?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) A) and D)
G) A) and E)

Question 9

For stable atoms of elements having low atomic numbers (≤ 20),the neutron-to-proton ratio is close to zero.

Accepted Answer

A) True 
 B)False  False

Question 10

A 55-kg person exposed to thorium-234 receives 7.5 × 104 β particles,each with an energy of 1.6 × 10-14 J.How many rads does the person receive?

Accepted Answer

A)  2.1 × 10-19 rads
B)  1.2 × 10-17 rads
C)  2.2 × 10-9 rads
D)  1.2 × 10-9 rads
E)  None of these choices is correct.F) A) and B)
G) A) and C)

Question 11

Identify the missing species in the following nuclear transmutation.

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) A) and D)
G) B) and E)

Question 12

Select the nuclide that completes the following nuclear reaction  ?

Accepted Answer

A)   
B)   
C)   
D)   
E)  None of these choices is correct.F) B) and D)
G) B) and C)

Question 13

Why is carbon dating possible?

Accepted Answer

A)  The amount of C-12 is not variable in living organisms.
B)  There is a constant ratio of C-12 to C-14 in living organisms but the ratio changes at a predictable rate after an organism dies.
C)  The amount of C-14 is constant in living organisms.
D)  None of the.E) B) and D)
F) None of the above

Question 14

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

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) B) and E)
G) B) and D)

Question 15

Uranium-235 decays by alpha emission.What isotope is also produced by this transformation?

Accepted Answer

A)  Pa-234
B)  Th-237
C)  Pu-237
D)  Th-231
E)  Pu-239F) B) and C)
G) B) and E)

Question 16

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) D) and E)
G) A) and B)

Question 17

Alpha particles are identical to

Accepted Answer

A)  protons.
B)  helium atoms.
C)  hydrogen atoms.
D)  helium nuclei.
E)  electrons.F) C) and E)
G) A) and E)

Question 18

In the following diagrams,A represents a radioactive isotope that decays into a new isotope,X.Each circle represents 1 mmol of atoms. t = 0: 21 disintegrations per second C) 3.00 disintegrations per second D) 7.23 × 1019 disintegrations per second E) 1.38 × 10-20 disintegrations per second" class="answers-bank-image d-inline" rel="preload" > t = 25.0 s: 21 disintegrations per second C) 3.00 disintegrations per second D) 7.23 × 1019 disintegrations per second E) 1.38 × 10-20 disintegrations per second" class="answers-bank-image d-inline" rel="preload" > Over the first 25.0 s,what is the disintegration rate of A?

Accepted Answer

A)  0.120 disintegrations per second
B)  1.81 × 1021 disintegrations per second
C)  3.00 disintegrations per second
D)  7.23 × 1019 disintegrations per second
E)  1.38 × 10-20 disintegrations per secondF) A) and B)
G) A) and C)

Question 19

What fraction of radioactive atoms remains in a sample after six half-lives?

Accepted Answer

A)  zero
B)  1/6
C)  1/16
D)  1/32
E)  1/64F) B) and D)
G) A) and B)

Question 20

The ___________ _________ ___________ is a quantitative measure of the nuclear stability of a nucleus,which is the energy required to break up a nucleus into its component protons and neutrons.

Accepted Answer

nuclear bi...

Exam 20: Nuclear Chemistry

Identify the missing species in the following nuclear transmutation. U-238 + ? → 1 neutron + Fm-249

Correct AnswerverifiedD

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

Correct AnswerverifiedShow Answer

The dose unit of ionizing radiation is called the rad.The rad is defined in terms of

Correct AnswerverifiedB

A gamma particle has a charge of -1.

Correct AnswerverifiedShow Answer

A particle accelerator uses which of the following to increase the kinetic energy of charged species so that a reaction will occur?

Correct AnswerverifiedShow Answer

Calculate the energy released in joules when one mole of polonium-214 decays according to the following equation. Particle Mass (amu) Pb-210 209) 98284 Po-214 213) 99519 He-4 4) 00260 (1 kg = 6.022 × 1026 amu; NA = 6.022 × 1023 mol-1; C = 2.99792458 × 108 m/s)

Correct AnswerverifiedShow Answer

Nuclei with an _____ number of protons and an _____ number of neutrons tend to be more stable than those with an _____ number of protons and/or an _____ number of neutrons.

Correct AnswerverifiedShow Answer

In the following diagrams,A represents a radioactive isotope that decays into a new isotope,X.Each circle represents 1 mmol of atoms. t = 0: t = 25.0 s: Which diagram best represents the sample at t = 50.0 s?

Correct AnswerverifiedShow Answer

For stable atoms of elements having low atomic numbers (≤ 20),the neutron-to-proton ratio is close to zero.

Correct AnswerverifiedFalse

A 55-kg person exposed to thorium-234 receives 7.5 × 104 β particles,each with an energy of 1.6 × 10-14 J.How many rads does the person receive?

Correct AnswerverifiedShow Answer

Identify the missing species in the following nuclear transmutation.

Correct AnswerverifiedShow Answer

Select the nuclide that completes the following nuclear reaction ?

Correct AnswerverifiedShow Answer

Why is carbon dating possible?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Uranium-235 decays by alpha emission.What isotope is also produced by this transformation?

Correct AnswerverifiedShow Answer

1 joule equals _____.

Correct AnswerverifiedShow Answer

Alpha particles are identical to

Correct AnswerverifiedShow Answer

In the following diagrams,A represents a radioactive isotope that decays into a new isotope,X.Each circle represents 1 mmol of atoms. t = 0: t = 25.0 s: Over the first 25.0 s,what is the disintegration rate of A?

Correct AnswerverifiedShow Answer

What fraction of radioactive atoms remains in a sample after six half-lives?

Correct AnswerverifiedShow Answer

The ___________ _________ ___________ is a quantitative measure of the nuclear stability of a nucleus,which is the energy required to break up a nucleus into its component protons and neutrons.

Correct Answerverifiednuclear bi...View AnswerShow Answer

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D

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B

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Calculate the energy released in joules when one mole of polonium-214 decays according to the following equation. Particle Mass (amu) Pb-210 209) 98284 Po-214 213) 99519 He-4 4) 00260 (1 kg = 6.022 × 10²⁶ amu; N_A = 6.022 × 10²³ mol^-1; C = 2.99792458 × 10⁸ m/s)

Correct Answer
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Nuclei with an ___ number of protons and an _ number of neutrons tend to be more stable than those with an _ number of protons and/or an ___ number of neutrons.

Correct Answer
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False

A 55-kg person exposed to thorium-234 receives 7.5 × 10⁴ β particles,each with an energy of 1.6 × 10^-14 J.How many rads does the person receive?

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The _______ _ _______ is a quantitative measure of the nuclear stability of a nucleus,which is the energy required to break up a nucleus into its component protons and neutrons.

Correct Answer
verified
nuclear bi...
View Answer