Question 1

If 24% of a certain radioisotope decays in 6.5 years, what is the half-life of this isotope?

Accepted Answer

A)  3.9 yr
B)  16 yr
C)  0.22 yr
D)  2.2 yr
E)  3.2 yrF) All of the above
G) C) and D)

Question 2

The fundamental unit of radioactivity is the ______ (Ci)

Accepted Answer

The answer of The fundamental unit of radioactivity is the...

Question 3

Balance the equation

Accepted Answer

The answer of Balance the equation ...

Question 4

Predict which nucleus is less stable,  or  .

Accepted Answer

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

Question 5

Estimate the age of a bottled wine that has a tritium, 3H, content 60% that of freshly bottled wine.Tritium decays by beta decay and has a half-life of 12.3 yr.  3H, content 60% that of freshly bottled wine.Tritium decays by beta decay and has a half-life of 12.3 yr.   A) 0.029 yr B) 7.4 yr C) 9.1 yr D) 16 yr E) 35 yr" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  0.029 yr
B)  7.4 yr
C)  9.1 yr
D)  16 yr
E)  35 yrF) B) and E)
G) B) and D)

Question 6

What type of nuclear process is illustrated below?

Accepted Answer

The answer of What type of nuclear process is illustrated...

Question 7

Naturally occurring uranium contains approximately 1% U-235 and 99% U-238.Of these, the isotope that undergoes fission in a nuclear reactor is U-238.

Accepted Answer

A) True 
 B)False

Question 8

Which one of the following statements about fission and fusion is false?

Accepted Answer

A)  Fission occurs among the heaviest isotopes, whereas fusion occurs more readily for light isotopes.
B)  For a fission reaction the mass defect ( Δ\DeltaΔ m) is negative, whereas for fusion  Δ\DeltaΔ m is positive.
C)  In order for fusion reactions to occur, temperatures must be in the millions of degrees.
D)  The fission of Pu-239 atoms produces a great number of isotopes of a large number of elements.
E)  Neutron-induced fission processes can occur at room temperature, rather than at millions of degrees. F) A) and E)
G) B) and C)

Question 9

The only stable isotope of iodine is iodine-127.Predict the mode of decay of  I.

Accepted Answer

A)  alpha emission
B)  beta emission
C)  positron emission
D)  electron captureE) B) and C)
F) A) and D)

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

Question 11

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

Question 12

List the given types of nuclear radiation (cosmic rays, medical and dental X rays, and nuclear waste)  in order of how much each contributes to the average yearly dose of nuclear radiation for AmericAns :

Accepted Answer

A)  cosmic rays 
B)  medical and dental X rays 
C)  nuclear waste 
D)  cosmic rays 
E)  medical and dental X rays F) B) and D)
G) A) and D)

Question 13

Calculate the energy released in joules when one mole of polonium-214 decays according to the equation 14 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" class="answers-bank-image d-inline" rel="preload" > Po 14 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" class="answers-bank-image d-inline" rel="preload" > 14 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" class="answers-bank-image d-inline" rel="preload" > Pb + 14 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" class="answers-bank-image d-inline" rel="preload" > 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/molF) B) and D)
G) B) and C)

Question 14

Alpha particles are identical to

Accepted Answer

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

Question 15

Sulfur-35 decays by beta emission.The decay product is

Accepted Answer

A)    P
B)    S
C)    Si
D)    Cl
E)    ClF) None of the above
G) A) and E)

Question 16

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

Accepted Answer

A)    Fr
B)    Rn
C)    Th
D)    Ac
E)    PoF) B) and C)
G) B) and E)

Question 17

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

Question 18

The rates of radioactive decay processes, like the rates of chemical reactions, are sensitive to temperature changes.

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

Question 20

Rubidium-87 decays by beta decay with a half-life of 4.9 × 1010 yr.How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3,500 disintegrations per hour?

Accepted Answer

A)  9.0 × 1016 atoms
B)  4.3 × 10-4 atoms
C)  2.2 × 1018 atoms
D)  2.5 × 1014 atoms
E)  1.7 × 1014 atomsF) D) and E)
G) C) and D)

Exam 19: Nuclear Chemistry

The rates of radioactive decay processes, like the rates of chemical reactions, are sensitive to temperature changes.

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Which one of the following statements about fission and fusion is false?

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

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Balance the equation

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

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The fundamental unit of radioactivity is the ______ (Ci)

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

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Predict which nucleus is less stable, or .

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Calculate the energy released in joules when one mole of polonium-214 decays according to the equation Po Pb + He. [Atomic masses: Pb-210 = 209.98284 amu, Po-214 = 213.99519 amu, He-4 = 4.00260 amu.]

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Sulfur-35 decays by beta emission.The decay product is

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If 24% of a certain radioisotope decays in 6.5 years, what is the half-life of this isotope?

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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)

Correct AnswerverifiedShow Answer

Estimate the age of a bottled wine that has a tritium, 3H, content 60% that of freshly bottled wine.Tritium decays by beta decay and has a half-life of 12.3 yr.

Correct AnswerverifiedShow Answer

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 + ____

Correct AnswerverifiedShow Answer

What type of nuclear process is illustrated below?

Correct AnswerverifiedShow Answer

Naturally occurring uranium contains approximately 1% U-235 and 99% U-238.Of these, the isotope that undergoes fission in a nuclear reactor is U-238.

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Alpha particles are identical to

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The only stable isotope of iodine is iodine-127.Predict the mode of decay of I.

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List the given types of nuclear radiation (cosmic rays, medical and dental X rays, and nuclear waste) in order of how much each contributes to the average yearly dose of nuclear radiation for AmericAns :

Correct AnswerverifiedShow Answer

Rubidium-87 decays by beta decay with a half-life of 4.9 × 1010 yr.How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3,500 disintegrations per hour?

Correct AnswerverifiedShow Answer

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

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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)

Correct Answer
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Estimate the age of a bottled wine that has a tritium,³H, content 60% that of freshly bottled wine.Tritium decays by beta decay and has a half-life of 12.3 yr.

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Rubidium-87 decays by beta decay with a half-life of 4.9 × 10¹⁰ yr.How many ⁸⁷Rb atoms are in a moon rock sample that has a rubidium decay rate of 3,500 disintegrations per hour?

Correct Answer
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