Question 1

When atoms of beryllium-9 are bombarded with alpha particles, neutrons are produced.What new isotope is also formed?  He +  Be   n + _____

Accepted Answer

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

Question 2

What is the decay rate of a sample of a radioisotope that has an activity of 12 microcuries? [1 curie = 3.7 $\times$10¹⁰disintegrations/s]

Accepted Answer

The answer of What is the decay rate of a...

Question 3

Decay of ruthenium-93 by positron emission yields

Accepted Answer

A) technetium-93. 
B) molybdenum-89. 
C) palladium-97. 
D) rhenium-93. 
E) ruthenium-92.

Question 4

On a neutron number versus proton number plot, the nucleus of oxygen-15 lies below the belt of stability. Write an equation for radioactive decay of oxygen-15.

Accepted Answer

The answer of On a neutron number versus proton number...

Question 5

What is the missing symbol in this plutonium fission reaction?  Pu +  n  ______ +  Sr + 3  n

Accepted Answer

A)   Ba 
B)  $\beta$ 
C)   Xe 
D)   Sr 
E)   Ba

Question 6

Complete and balance the nuclear equation

Accepted Answer

The answer of Complete and balance the nuclear equation ...

Question 7

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 $\times$ 10-2 
B) 0.197 
C) 3.51 
D) 33.3 
E) None of these.

Question 8

How old is a bottle of wine if the tritium (3H)content is 25% that of a new wine? The half-life of tritium is 12.5 years.

Accepted Answer

A) 0.25 yr 
B) 3.1 yr 
C) 25 yr 
D) 38 yr 
E) 50.yr

Question 9

The alpha particles emitted by radon-222 have an energy of 8.8 $\times$ 10^-13 J. If a 200.g Pb brick absorbs 1.0 $\times$ 10¹⁰ alpha particles from radon decay, what dose in rads will the brick absorb?

Accepted Answer

The answer of The alpha particles emitted by radon-222 have...

Question 10

The isotope of iodine with mass number 128 undergoes beta decay with a half-life of 25.00 minutes. Write a balanced nuclear reaction for this process.

Accepted Answer

The answer of The isotope of iodine with mass number...

Question 11

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.]

Accepted Answer

A) 8.78 $\times$ 1014 J/mol 
B) 7.2 $\times$ 1014 J/mol 
C) 8.78 $\times$ 1011 J/mol 
D) -9.75 $\times$ 10-3 J/mol 
E) 1.46 $\times$ 10-9 J/mol

Question 12

In the  Th decay series there are six radioisotopes that decay by alpha emission, including Th-232 itself, and four radioisotopes that decay by beta emission. The final product of this series is a stable isotope. The symbol for this product is

Accepted Answer

A)   W 
B)   W 
C)   Pb 
D)   Pb 
E)   Pt

Question 13

Compare nuclear reactions with chemical reactions in terms of the conservation of mass.

Accepted Answer

The answer of Compare nuclear reactions with chemical reactions in...

Question 14

Charcoal found under a stone at Stonehenge, England, has a carbon-14 activity that is 0.60 that of new wood.How old is the charcoal? (The half-life of carbon-14 is 5,730 years.)

Accepted Answer

A) Less than 5,730 yr 
B) Between 5,730 and 11,460 yr 
C) Between 11,460 and 17,190 yr 
D) More than 17,190 yr

Question 15

Balance the equation  Th   + ? .

Accepted Answer

The answer of Balance the equation  Th  ...

Question 16

A sample of a radioisotope shows an activity of 999 disintegrations per minute due to beta decay. If after 1.10 years the activity is 952 disintegrations per minute, what is the half-life of this radioisotope?

Accepted Answer

A) 4.38 $\times$ 10-2 yr 
B) 11.4 yr 
C) 0.25 yr 
D) 15.8 yr 
E) 9.1 yr

Question 17

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.  H   He +

Accepted Answer

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

Question 18

What nuclear fuel is produced in a breeder reactor?

Accepted Answer

The answer of What nuclear fuel is produced in a...

Question 19

On a plot of the number of neutrons versus the number of protons, a nucleus of aluminum-28 lies above the belt of stability. Write an equation for radioactive decay of aluminum-28.

Accepted Answer

The answer of On a plot of the number of...

Question 20

Find the nuclear binding enrgy of uranium-234 (atomic mass = 234.040947 amu)in units of joules per nucleon.[Data: neutron mass = 1.674928 $\times$ 10-24 g; proton mass = 1.672623 $\times$ 10-24 g; electron mass = 9.109387 $\times$ 10-28 g; NA = 6.0221367 $\times$ 1023 /mol; c = 2.99792458 $\times$ 108 m/s]

Accepted Answer

A) 2.97 $\times$ 10-10 J/nucleon 
B) 3.04 $\times$ 10-10 J/nucleon 
C) 1.30 $\times$ 10-12 J/nucleon 
D) 1.22 $\times$ 10-12 J/nucleon 
E) 1.27 $\times$ 10-12 J/nucleon

Exam 23: Nuclear Chemistry

When atoms of beryllium-9 are bombarded with alpha particles, neutrons are produced.What new isotope is also formed? He + Be n + _____

What is the decay rate of a sample of a radioisotope that has an activity of 12 microcuries? [1 curie = 3.7 $\times$ 10¹⁰disintegrations/s]

Decay of ruthenium-93 by positron emission yields

On a neutron number versus proton number plot, the nucleus of oxygen-15 lies below the belt of stability. Write an equation for radioactive decay of oxygen-15.

Complete and balance the nuclear equation

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?

How old is a bottle of wine if the tritium (³H) content is 25% that of a new wine? The half-life of tritium is 12.5 years.

The alpha particles emitted by radon-222 have an energy of 8.8 $\times$ 10^-13 J. If a 200.g Pb brick absorbs 1.0 $\times$ 10¹⁰ alpha particles from radon decay, what dose in rads will the brick absorb?

The isotope of iodine with mass number 128 undergoes beta decay with a half-life of 25.00 minutes. Write a balanced nuclear reaction for this process.

In the Th decay series there are six radioisotopes that decay by alpha emission, including Th-232 itself, and four radioisotopes that decay by beta emission. The final product of this series is a stable isotope. The symbol for this product is

Compare nuclear reactions with chemical reactions in terms of the conservation of mass.

Charcoal found under a stone at Stonehenge, England, has a carbon-14 activity that is 0.60 that of new wood.How old is the charcoal? (The half-life of carbon-14 is 5,730 years.)

Balance the equation Th + ? .

A sample of a radioisotope shows an activity of 999 disintegrations per minute due to beta decay. If after 1.10 years the activity is 952 disintegrations per minute, what is the half-life of this radioisotope?

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. H He +

What nuclear fuel is produced in a breeder reactor?

On a plot of the number of neutrons versus the number of protons, a nucleus of aluminum-28 lies above the belt of stability. Write an equation for radioactive decay of aluminum-28.

Exam 23: Nuclear Chemistry

When atoms of beryllium-9 are bombarded with alpha particles, neutrons are produced.What new isotope is also formed? He + Be n + _____

What is the decay rate of a sample of a radioisotope that has an activity of 12 microcuries? [1 curie = 3.7 ×\times× 1010 disintegrations/s]

Decay of ruthenium-93 by positron emission yields

On a neutron number versus proton number plot, the nucleus of oxygen-15 lies below the belt of stability. Write an equation for radioactive decay of oxygen-15.

What is the missing symbol in this plutonium fission reaction? Pu + n ______ + Sr + 3 n

Complete and balance the nuclear equation

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?

How old is a bottle of wine if the tritium (3H) content is 25% that of a new wine? The half-life of tritium is 12.5 years.

The alpha particles emitted by radon-222 have an energy of 8.8 ×\times× 10-13 J. If a 200.g Pb brick absorbs 1.0 ×\times× 1010 alpha particles from radon decay, what dose in rads will the brick absorb?

The isotope of iodine with mass number 128 undergoes beta decay with a half-life of 25.00 minutes. Write a balanced nuclear reaction for this process.

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.]

In the Th decay series there are six radioisotopes that decay by alpha emission, including Th-232 itself, and four radioisotopes that decay by beta emission. The final product of this series is a stable isotope. The symbol for this product is

Compare nuclear reactions with chemical reactions in terms of the conservation of mass.

Charcoal found under a stone at Stonehenge, England, has a carbon-14 activity that is 0.60 that of new wood.How old is the charcoal? (The half-life of carbon-14 is 5,730 years.)

Balance the equation Th + ? .

A sample of a radioisotope shows an activity of 999 disintegrations per minute due to beta decay. If after 1.10 years the activity is 952 disintegrations per minute, what is the half-life of this radioisotope?

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. H He +

What nuclear fuel is produced in a breeder reactor?

On a plot of the number of neutrons versus the number of protons, a nucleus of aluminum-28 lies above the belt of stability. Write an equation for radioactive decay of aluminum-28.

What is the decay rate of a sample of a radioisotope that has an activity of 12 microcuries? [1 curie = 3.7 $\times$ 10¹⁰disintegrations/s]

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?

How old is a bottle of wine if the tritium (³H) content is 25% that of a new wine? The half-life of tritium is 12.5 years.

The alpha particles emitted by radon-222 have an energy of 8.8 $\times$ 10^-13 J. If a 200.g Pb brick absorbs 1.0 $\times$ 10¹⁰ alpha particles from radon decay, what dose in rads will the brick absorb?

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. H He +