Question 1

The amount of time that it takes for half of a radioactive sample to decay is called half-time.

Accepted Answer

A) True 
 B)False

Question 2

The neutron was discovered in 1932 by James Chadwick, when he bombarded beryllium-9 with an alpha particle.The products were a neutron and another nuclide.What is the other nuclide?

Accepted Answer

A)  boron-12
B)  lithium-8
C)  carbon-13
D)  carbon-12
E)  boron-13 D

Question 3

What product is formed when  undergoes 5 alpha emissions and 2 beta emissions in a total of seven steps?

Accepted Answer

A)  mercury-214
B)  polonium-214
C)  polonium-224
D)  mercury-204
E)  plutonium-239

Question 4

Alpha particles are the least harmful type of radiation upon external exposure of animal tissues.

Accepted Answer

A) True 
 B)False

Question 5

Predict the type of radiation that should be emitted when oxygen-14 undergoes radioactive decay.

Accepted Answer

A)  beta particle (  )  emission
B)  positron emission
C)  alpha particle emission
D)  proton emission
E)  neutron emission

Question 6

The half-life of iodine-123 is 13.3 hours.How much of a 25.0 mg sample will remain after 39.9 hours?

Accepted Answer

A)  25.0 mg
B)  12.5 mg
C)  6.25 mg
D)  3.12 mg
E)  1.56 mg

Question 7

What product is formed when  undergoes 2 alpha emissions and 2 beta emissions in a total of four steps?

Accepted Answer

A)  actinium-227
B)  thorium-227
C)  thorium-231
D)  polonium-231
E)  radon-227

Question 8

Which process decreases the atomic number of an element by two?

Accepted Answer

A)  alpha particle emission
B)  beta particle emission
C)  positron emission
D)  gamma ray emission
E)  none of these

Question 9

Thorium-234 decays by alpha emission to form a new nuclide.Identify the new nuclide.

Accepted Answer

A)  radium-228
B)  radium-230
C)  protactinium-234
D)  protactinium-230
E)  thorium-232

Question 10

Strontium-90 has a half-life of 28 years.How long will it take for 75% of the isotope to decay?

Accepted Answer

A)  28 years
B)  14 years
C)  42 years
D)  56 years
E)  84 years

Question 11

Which of the following statements is incorrect?

Accepted Answer

A)  Pacemakers for heart patients are powered by a plutonium-238 power device.
B)  Iodine-131 is used for diagnosing thyroid tumors since iodine is preferentially absorbed by the thyroid gland.
C)  Metastable technetium-99 is used for medical diagnosis because it is absorbed by tumor cells, but not normal brain cells.
D)  Carbon-14 is used for PET imaging due to its long half-life and stability.
E)  Gamma radiation from cobalt-60 is used to treat cancer patients.

Question 12

Radon-222 decays by alpha emission to form a new nuclide.Identify the new nuclide.

Accepted Answer

A)  francium-222
B)  francium-223
C)  polonium-222
D)  polonium-218
E)  bismuth-220

Question 13

Thorium-234 decays by beta emission to form a new nuclide.Identify the new nuclide.

Accepted Answer

A)  actinium-234
B)  protactinium-231
C)  protactinium-234
D)  radium-230
E)  radon-230 C

Question 14

Iridium-192 has a half-life of 74 days.How long will it take for 75% of the isotope to decay?

Accepted Answer

A)  74 days
B)  111 days
C)  37 days
D)  185 days
E)  148 days

Question 15

Carbon-14 has a half-life of 5730 yr.A living organism has an activity of 15.2 counts per minute (cpm)  per gram of carbon.If a bone is determined to have an activity of 1.90 cpm per gram of carbon, how old is the bone?

Accepted Answer

A)  5730 yr
B)  17,200 yr
C)  22,900 yr
D)  8600 yr
E)  11,500 yr

Question 16

atoms that have an excess of matter, energy, or both.

Accepted Answer

radiation ...

Question 17

Which of the following statements regarding the possible effects of radiation on a cell is incorrect?

Accepted Answer

A)  Radiation can pass through a cell with no damage.
B)  Radiation can damage a cell, but it is possible for the cell to repair the damage.
C)  Radiation may damage a cell so severely that it cannot repair itself.
D)  A damaged cell may mutate, and cause cancer.
E)  The degree of damage does not depend on the ionizing ability of the radiation.

Question 18

What type of radioactive decay would be expected for the unstable nuclide ?

Accepted Answer

A)  alpha particle emission
B)  beta particle (electron)  emission
C)  positron emission
D)  gamma ray emission
E)  neutron emission

Question 19

The figure shows an example of:

Accepted Answer

A)  a fusion reaction.
B)  beta-particle emission.
C)  a fission reaction.
D)  an electron capture reaction.
E)  alpha-particle emission.

Question 20

Which of the following forms of radiation is most penetrating?

Accepted Answer

A)  alpha
B)  beta
C)  gamma
D)  positron
E)  proton C

Exam 15: Nuclear Chemistry

The amount of time that it takes for half of a radioactive sample to decay is called half-time.

Correct AnswerverifiedShow Answer

The neutron was discovered in 1932 by James Chadwick, when he bombarded beryllium-9 with an alpha particle.The products were a neutron and another nuclide.What is the other nuclide?

Correct AnswerverifiedD

What product is formed when undergoes 5 alpha emissions and 2 beta emissions in a total of seven steps?

Correct AnswerverifiedShow Answer

Alpha particles are the least harmful type of radiation upon external exposure of animal tissues.

Correct AnswerverifiedShow Answer

Predict the type of radiation that should be emitted when oxygen-14 undergoes radioactive decay.

Correct AnswerverifiedShow Answer

The half-life of iodine-123 is 13.3 hours.How much of a 25.0 mg sample will remain after 39.9 hours?

Correct AnswerverifiedShow Answer

What product is formed when undergoes 2 alpha emissions and 2 beta emissions in a total of four steps?

Correct AnswerverifiedShow Answer

Which process decreases the atomic number of an element by two?

Correct AnswerverifiedShow Answer

Thorium-234 decays by alpha emission to form a new nuclide.Identify the new nuclide.

Correct AnswerverifiedShow Answer

Strontium-90 has a half-life of 28 years.How long will it take for 75% of the isotope to decay?

Correct AnswerverifiedShow Answer

Which of the following statements is incorrect?

Correct AnswerverifiedShow Answer

Radon-222 decays by alpha emission to form a new nuclide.Identify the new nuclide.

Correct AnswerverifiedShow Answer

Thorium-234 decays by beta emission to form a new nuclide.Identify the new nuclide.

Correct AnswerverifiedC

Iridium-192 has a half-life of 74 days.How long will it take for 75% of the isotope to decay?

Correct AnswerverifiedShow Answer

Carbon-14 has a half-life of 5730 yr.A living organism has an activity of 15.2 counts per minute (cpm) per gram of carbon.If a bone is determined to have an activity of 1.90 cpm per gram of carbon, how old is the bone?

Correct AnswerverifiedShow Answer

atoms that have an excess of matter, energy, or both.

Correct Answerverifiedradiation ...View AnswerShow Answer

Which of the following statements regarding the possible effects of radiation on a cell is incorrect?

Correct AnswerverifiedShow Answer

What type of radioactive decay would be expected for the unstable nuclide ?

Correct AnswerverifiedShow Answer

The figure shows an example of:

Correct AnswerverifiedShow Answer

Which of the following forms of radiation is most penetrating?

Correct AnswerverifiedC

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C

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radiation ...
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C