Deck 15: Nuclear Chemistry

Question 1

Which of the following forms of radiation is most penetrating?

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

Answer 1

gamma

Question 2

Which of the following processes results in the conversion of a neutron to a proton within a nucleus?

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

Answer 2

beta ( )particle emission

Question 3

Rank the following in order of increasing penetrating ability: alpha particles, beta particles, gamma rays.

A)alpha particles < beta particles < gamma rays
B)alpha particles < gamma rays < beta particles
C)gamma rays < beta particles < alpha particles
D)beta particles < alpha particles < gamma rays
E)beta particles < gamma rays < alpha particles

Answer 3

alpha particles < beta particles < gamma rays

Question 4

Which of the following is a form of radiation composed of negatively charged particles?

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

Question 5

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

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

Question 6

Which of the following statements regarding nuclear chemistry is correct?

A)In the lighter elements that are stable, the neutron to proton ratio is about 2.
B)Nuclides inside the band of stability are radioactive.
C)A positron is a particle that is similar to an electron, except that it has a positive charge.
D)A beta particle is a particle that has less penetrating ability than an alpha particle.
E)An alpha particle is equivalent to the nucleus of a hydrogen atom.

Question 7

Gamma rays are

A)high-energy electromagnetic radiation.
B)H nuclei.
C)electrons.
D)He nuclei.
E)positrons.

Question 8

A beta particle has a mass number of ________ and a charge of ________.

A)1, 0
B)0, 0
C)0, 1- or 1+
D)1, 1+
E)1, 1-

Question 9

Which of the following forms of radiation is least penetrating?

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

Question 10

Alpha particles are equivalent to

A)He atoms.
B)H atoms.
C)electrons.
D)positrons
E)He nuclei.

Question 11

Beta particles are equivalent to

A)He nuclei.
B)H atoms.
C)electrons only.
D)positrons only.
E)either electrons or positrons.

Question 12

Which of the following statements regarding nuclear chemistry is correct?

A)Atoms with the same mass number but different atomic numbers are called isotopes.
B)All isotopes are radioactive.
C)Radioactive decay always results in the emission of an alpha particle.
D)Radioactive decay processes result in a change in the nucleus of the isotope undergoing reaction.
E)A nuclear particle (a proton or neutron)is called a nuclide.

Question 13

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

A)both beta particle emission and electron capture
B)alpha particle emission
C)beta particle emission
D)positron emission
E)gamma ray emission

Question 14

Which of the following processes results in the conversion of a proton to a neutron within a nucleus?

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

Question 15

Which of the following changes occur to the nucleus when a heavy element undergoes alpha particle emission?

A)Only the number of neutrons decreases.
B)Only the number of protons decreases.
C)Only the number of neutrons increases.
D)Only the number of protons increases.
E)Both the number of neutrons and protons decreases.

Question 16

An alpha particle has a mass number of ________ and a charge of ________.

A)1, 2+
B)2, 0
C)4, 2+
D)4, 0

Question 17

Which of the following forms of radiation has no mass?

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

Question 18

A gamma ray has a mass number of ________ and a charge of ________.

A)1, 0
B)1, 1+
C)-1, 1-
D)0, 0
E)0, 1+

Question 19

Which process increases the atomic number of an element by one?

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

Question 20

Which of the following statements regarding nuclear chemistry is correct?

A)Most of the known nuclides are stable.
B)There is no clear relationship between the stability of a radioactive nuclide and the combination of neutron and proton numbers in the nucleus.
C)A nuclide is an atom with a specific atomic number, mass number, and neutron number.
D)Nucleon is the term used to describe either a proton or an electron.
E)Each element has only one isotope.

Question 21

What is the missing symbol in the following nuclear transformation? + → ________ +

A)
B)
C)
D)
E)

Question 22

Bombardment of cobalt-59 with a neutron produces a manganese-56 atom and another particle. What is this particle?

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

Question 23

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

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

Question 24

The first transmutation of an element was performed in 1919 by Ernest Rutherford when he bombarded nitrogen-14 with an alpha particle. The products were a proton, and another nuclide. What is the other nuclide?

A)nitrogen-18
B)nitrogen-17
C)fluorine-17
D)oxygen-17
E)oxygen-16

Question 25

What is the missing symbol in the following nuclear transformation? + → ______

A)
B)
C)
D)
E)

Question 26

Identify the particle emitted by the nucleus that undergoes the transformation shown in the figure.

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

Question 27

Bombardment of boron-10 with a projectile particle produces a nitrogen-14 atom and a gamma ray. What is the projectile particle?

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

Question 28

Uranium-238 decays by alpha emission to form a new nuclide. Identify the new nuclide.

A)neptunium-238
B)protactinium-238
C)thorium-234
D)thorium-238
E)uranium-235

Question 29

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

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

Question 30

Predict the type of radiation emitted when boron-8 decays spontaneously.

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

Question 31

What is the missing symbol in the following nuclear transformation? + → +

A)
B)
C)
D)
E)

Question 32

Identify the particle emitted by the nucleus that undergoes the transformation shown in the figure.

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

Question 33

Bombardment of boron-10 with a neutron produces a hydrogen-1 atom and another nuclide. What is this nuclide?

A)beryllium-10
B)boron-11
C)boron-9
D)carbon-12
E)beryllium-9

Question 34

Carbon-14 decays by beta emission to form a new nuclide. Identify the new nuclide.

A)nitrogen-14
B)nitrogen-13
C)carbon-12
D)carbon-13
E)beryllium-10

Question 35

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

A)thorium-234
B)uranium-234
C)actinium-230
D)francium-232
E)thorium-233

Question 36

Potassium-40 decays by beta emission to form a new nuclide. Identify the new nuclide.

A)argon-40
B)chlorine-36
C)calcium-40
D)calcium-39
E)phosphorus-38

Question 37

What is the missing symbol in the following nuclear transformation? + → _____ +

A)
B)
C)
D)
E)

Question 38

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?

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

Question 39

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

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

Question 40

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

A)neptunium-234
B)protactinium-234
C)thorium-230
D)thorium-234
E)uranium-235

Question 41

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

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

Question 42

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

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

Question 43

Select the most stable isotope from the following choices.

A)
B)
C)
D)
E)

Question 44

The half-life of technetium-99 is 6.0 hours. How much of a 50.0 mg sample will remain after 24 hours?

A)25.0 mg
B)12.5 mg
C)6.25 mg
D)3.12 mg
E)none of the sample will remain

Question 45

The half-life of technetium-99 is 6.0 hours. How much of a 25.0 mg sample will remain after 24 hours?

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

Question 46

Select the most stable isotope from the following choices.

A)
B)
C)
D)
E)

Question 47

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

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

Question 48

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

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

Question 49

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

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

Question 50

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

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

Question 51

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

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

Question 52

Iridium-192 has a half-life of 74 days. What fraction of a sample of this isotope will remain after 222 days?

A)1/2
B)1/4
C)1/3
D)1/8
E)1/16

Question 53

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

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

Question 54

The half-life of iodine-131 is 8.1 days. How much of a 45.0 mg sample will remain after 24.3 days?

A)2.81 mg
B)5.62 mg
C)11.2 mg
D)22.5 mg
E)45.0 mg

Question 55

Predict the type of radiation that should be emitted when oxygen-18 undergoes radioactive decay.

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

Question 56

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

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

Question 57

The half-life of iodine-123 is 13.3 hours. How much of a 50.0 mg sample will remain after 39.9 hours?

A)50.0 mg
B)25.0 mg
C)12.5 mg
D)6.25 mg
E)3.12 mg

Question 58

Phosphorus-32 has a half-life of 14 days. What fraction of a sample of this isotope will remain after 6 weeks?

A)1/2
B)1/4
C)1/3
D)1/8
E)1/16

Question 59

Select the most stable isotope from the following choices.

A)
B)
C)
D)
E)

Question 60

The half-life of iodine-131 is 8.1 days. How much of a 75.0 mg sample will remain after 24.3 days?

A)75.0 mg
B)37.5 mg
C)18.8 mg
D)9.38 mg
E)4.68 mg

Question 61

Which of the following isotopes would be the best choice for use with PET?

A)
B)
C)
D)
E)

Question 62

The reaction + → + + 3 is an example of

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

Question 63

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 3.80 cpm per gram of carbon, how old is the bone?

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

Question 64

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

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

Question 65

Carbon-11 radioactively decays by positron emission with a half-life of 20.4 minutes. If a dosage of carbon-11 is administered to a patient for a PET scan, what percentage of carbon-11 will remain in the patient's system after 81.6 min?

A)75.0%
B)12.5%
C)87.5%
D)25.0%
E)6.25%

Question 66

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

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 67

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?

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

Question 68

Carbon-11 radioactively decays by positron emission with a half-life of 20.4 minutes. If a dosage of carbon-11 is administered to a patient for a PET scan, what percentage of carbon-11 will remain in the patient's system after 61.2 min?

A)75.0%
B)12.5%
C)87.5%
D)25.0%
E)50.0%

Question 69

Why is radon gas dangerous?

A)It reacts chemically with lung tissue.
B)It emits gamma rays.
C)It undergoes fusion reactions, producing lots of energy.
D)It undergoes fission reactions at a very high rate.
E)Its decay products are radioactive solids that can attach to lung tissue and cause cell damage upon decay.

Question 70

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

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

Question 71

What kind of isotope is used for PET scans?

A)proton absorbers
B)neutron emitters
C)positron emitters
D)beta emitters
E)neutron absorbers

Question 72

What is product of the first step of radioactive decay when decays by alpha emission?

A)
B)
C)
D)
E)

Question 73

Which of the following statements regarding nuclear stability is incorrect?

A)Isotopes with excess mass tend to undergo alpha decay.
B)Isotopes with an N/Z ratio that is too high tend to undergo beta decay.
C)Isotopes with an N/Z ratio that is too low tend to undergo either positron emission or electron capture.
D)Electron capture is the most common mode of decay for smaller isotopes.
E)An energetically excited nucleus can undergo gamma emission.

Question 74

Which of the following statements is incorrect?

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 75

The reaction + → + + 2 is an example of

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

Question 76

The figure shows an example of

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

Question 77

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

A)lead-234
B)radon-234
C)thorium-230
D)radon-232
E)radon-228

Question 78

What product is formed when undergoes 6 alpha emissions and 3 beta emissions in a total of nine steps?

A)lead-223
B)mercury-223
C)mercury-226
D)bismuth-214
E)lead-214

Question 79

Which of the following statements regarding nuclear stability is incorrect?

A)The N/Z ratio is about 1 for the first 20 elements.
B)The N/Z ratio is about 1.6 for elements at the upper end of the band of stability.
C)An N/Z ratio of 1 means that an element has an equal number of protons and electrons.
D)Elements outside the band of stability are radioactive.
E)All isotopes with Z greater than 83 are radioactive.

Question 80

When bombarded by a neutron, uranium-235 undergoes fission. If the nuclides produced are xenon-139 and strontium-95, how many neutrons are emitted?

A)none
B)1
C)2
D)3
E)4