Question 1

The number of nucleons in a   U2+ nucleus is

Accepted Answer

A) 92. 
B) 144. 
C) 236. 
D) 328. 
A) 92. 
B) 144. 
C) 236. 
D) 328.

Question 2

The number of neutrons in   Fe2+ is

Accepted Answer

A) 26. 
B) 36. 
C) 60. 
D) 62. 
A) 26. 
B) 36. 
C) 60. 
D) 62.

Question 3

What is needed to balance the nuclear fusion reaction below?
2   H →   H + ?

Accepted Answer

The answer of What is needed to balance the nuclear...

Question 4

Which one of the following is most penetrating?

Accepted Answer

A) alpha particles 
B) beta particles 
C) gamma rays 
D) positrons 
A) alpha particles 
B) beta particles 
C) gamma rays 
D) positrons

Question 5

Tell the type of decay process occurring in the following nuclear reaction.

Accepted Answer

A) α emission 
B) β emission 
C) γ emission 
D) electron capture or positron emission 
A) α emission 
B) β emission 
C) γ emission 
D) electron capture or positron emission

Question 6

Neptunium-239 has a half-life of 2.35 days.How many days must elapse for a sample of 239Np to decay to 3.00% of its original quantity?

Accepted Answer

A) 0.0841 days 
B) 0.967 days 
C) 1.03 days 
D) 11.9 days 
A) 0.0841 days 
B) 0.967 days 
C) 1.03 days 
D) 11.9 days

Question 7

Which of the following elements would be expected to be particularly stable?

Accepted Answer

A)   
C 
B)   
B 
C)   
Be 
D)   
Li 
A)   
C 
B)   
B 
C)   
Be 
D)   
Li

Question 8

When more than 3000 known nuclides are plotted on a neutron/proton grid,they make up a group called

Accepted Answer

A) the "island of stability." 
B) the "band of nuclear stability." 
C) the "sea of instability." 
D) none of these 
A) the "island of stability." 
B) the "band of nuclear stability." 
C) the "sea of instability." 
D) none of these

Question 9

Which one of the following combinations of neutrons/protons results in the lowest number of nonradioactive (stable)isotopes?

Accepted Answer

A) even number protons/even number neutrons 
B) even number protons/odd number neutrons 
C) odd number protons/even number neutrons 
D) odd number protons/odd number neutrons 
A) even number protons/even number neutrons 
B) even number protons/odd number neutrons 
C) odd number protons/even number neutrons 
D) odd number protons/odd number neutrons

Question 10

A radioisotope has a neutron/proton ratio which is too low.Which of the following processes will not occur for such a nucleus?

Accepted Answer

A) alpha emission 
B) beta emission 
C) electron capture 
D) positron emission 
A) alpha emission 
B) beta emission 
C) electron capture 
D) positron emission

Question 11

201Tl is used in myocardial perfusion imaging.It undergoes beta decay with a half-life of 73 hours generating 80 keV X-rays.A typical dose is 2.5 mCi which is equal to ________ Bq.

Accepted Answer

Question 12

Energy is ________ (released,required)in the transmutation reaction shown below.The atomic masses are 40Ar (39.9624),1H (1.0078),40K (39.9640),1n (1.0087).   Ar +   H →   Kr +   n

Accepted Answer

Question 13

-What kind of decay process is occurring in the decay of isotope D to isotope E in the figure shown above?

Accepted Answer

A) α emission 
B) β emission 
C) γ emission 
D) electron capture or positron emission 
A) α emission 
B) β emission 
C) γ emission 
D) electron capture or positron emission

Question 14

Which process decreases the neutron/proton ratio?

Accepted Answer

A) alpha emission 
B) beta emission 
C) electron capture 
D) positron emission 
A) alpha emission 
B) beta emission 
C) electron capture 
D) positron emission

Question 15

If the age of the Earth is 4.5 billion years and the half-life of 40K is 1.26 billion years,what percent of the Earth's original amount of 40K remains today?

Accepted Answer

A) 4.2% 
B) 8.4% 
C) 12% 
D) 16% 
A) 4.2% 
B) 8.4% 
C) 12% 
D) 16%

Question 16

The sum of the masses of the protons and neutrons in a given nucleus minus the mass of that nucleus is always

Accepted Answer

A) negative. 
B) positive. 
C) temperature dependent. 
D) zero. 
A) negative. 
B) positive. 
C) temperature dependent. 
D) zero.

Question 17

The decay curve shown below approximates the decay of iodine-123.What is the approximate half-life of iodine-123?

Accepted Answer

A) 13 hours 
B) 26 hours 
C) 32.5 hours 
D) 35 hours 
A) 13 hours 
B) 26 hours 
C) 32.5 hours 
D) 35 hours

Question 18

Carbon-14,which is present in all living tissue,radioactively decays via a first-order process.A one-gram sample of wood taken from a living tree gives a rate for carbon-14 decay of 13.6 counts per minute.If the half-life for carbon-14 is 5715 years,how old is a wood sample that gives a rate for carbon-14 decay of 3.9 counts per minute?

Accepted Answer

A) 4.6 × 103 yr 
B) 6.6 × 103 yr 
C) 1.0 × 104 yr 
D) 2.9 × 104 yr 
A) 4.6 × 103 yr 
B) 6.6 × 103 yr 
C) 1.0 × 104 yr 
D) 2.9 × 104 yr

Question 19

Which nuclide below is most likely to decay by electron capture?

Accepted Answer

A)   
Yb 
B)   
Yb 
C)   
Yb 
D)   
Yb 
A)   
Yb 
B)   
Yb 
C)   
Yb 
D)   
Yb

Question 20

The two reactions shown below are classified as (1)nuclear ________ and (2)nuclear ________.
(1)   n +   U →   Ba +   Kr + 3   n
(2)   H +   H →   He

Accepted Answer

The answer of The two reactions shown below are classified...

Exam 19: Nuclear Chemistry

The number of nucleons in a U2+ nucleus is

The number of neutrons in Fe2+ is

What is needed to balance the nuclear fusion reaction below? 2 H → H + ?

Which one of the following is most penetrating?

Tell the type of decay process occurring in the following nuclear reaction.

Neptunium-239 has a half-life of 2.35 days.How many days must elapse for a sample of 239Np to decay to 3.00% of its original quantity?

Which of the following elements would be expected to be particularly stable?

When more than 3000 known nuclides are plotted on a neutron/proton grid,they make up a group called

Which one of the following combinations of neutrons/protons results in the lowest number of nonradioactive (stable)isotopes?

A radioisotope has a neutron/proton ratio which is too low.Which of the following processes will not occur for such a nucleus?

201Tl is used in myocardial perfusion imaging.It undergoes beta decay with a half-life of 73 hours generating 80 keV X-rays.A typical dose is 2.5 mCi which is equal to ________ Bq.

Energy is ________ (released,required)in the transmutation reaction shown below.The atomic masses are 40Ar (39.9624),1H (1.0078),40K (39.9640),1n (1.0087). Ar + H → Kr + n

-What kind of decay process is occurring in the decay of isotope D to isotope E in the figure shown above?

Which process decreases the neutron/proton ratio?

If the age of the Earth is 4.5 billion years and the half-life of 40K is 1.26 billion years,what percent of the Earth's original amount of 40K remains today?

The sum of the masses of the protons and neutrons in a given nucleus minus the mass of that nucleus is always

The decay curve shown below approximates the decay of iodine-123.What is the approximate half-life of iodine-123?

Which nuclide below is most likely to decay by electron capture?

The two reactions shown below are classified as (1)nuclear ________ and (2)nuclear ________. (1) n + U → Ba + Kr + 3 n (2) H + H → He

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The number of nucleons in a U²⁺nucleusis

The number of neutrons in Fe²⁺ is

Neptunium-239 has a half-life of 2.35 days.How many days must elapse for a sample of ²³⁹Np to decay to 3.00% of its original quantity?

²⁰¹Tl is used in myocardial perfusion imaging.It undergoes beta decay with a half-life of 73 hours generating 80 keV X-rays.A typical dose is 2.5 mCi which is equal to ________ Bq.

Energy is ________ (released,required)in the transmutation reaction shown below.The atomic masses are ⁴⁰Ar (39.9624),¹H (1.0078),⁴⁰K (39.9640),¹n (1.0087). Ar + H → Kr + n

If the age of the Earth is 4.5 billion years and the half-life of ⁴⁰K is 1.26 billion years,what percent of the Earth's original amount of ⁴⁰K remains today?

The two reactions shown below are classified as (1)nuclear and (2)nuclear . (1) n + U → Ba + Kr + 3 n (2) H + H → He