Question 1

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.F) B) and C)
G) A) and E)

Question 2

Find the nuclear binding energy of potassium-40 (atomic mass = 39.9632591 amu)  in units of joules per nucleon. [Data: neutron mass = 1.674928 * 10-24 g; proton mass = 1.672623 * 10-24g; electron mass = 9.109387 * 10-28 g; NA = 6.0221367 * 1023 /mol; c = 2.99792458 * 108 m/s]

Accepted Answer

A)   1.37 * 10-12 J/nucleon
B)   5.48 * 10-11 J/nucleon
C)   5.64 * 10-11 J/nucleon
D)   1.41 * 10-12 J/nucleon
E)   2.97 * 10-12 J/nucleonF) D) and E)
G) B) and C)

Question 3

A plot of the number of neutrons versus the number of protons in various isotopes produces a "belt of stability." Isotopes below the belt of stability (i.e., with a smaller neutron-to-proton ratio) decay by beta particle emission.

Accepted Answer

A) True 
 B)False

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

The definition of free radicals is molecular fragments having one or more unpaired electrons.

Accepted Answer

A) True 
 B)False

Question 6

Compared to chemical reactions nuclear reactions, in terms of the quantity of energy released, have approximately one thousand times greater energy production for comparable amounts.

Accepted Answer

A) True 
 B)False

Question 7

What role does cadmium metal (Cd)  play in a nuclear reactor

Accepted Answer

A)   slows down the fission neutrons (moderator) 
B)   transfers heat from the reactor to the heat exchanger (primary coolant) 
C)   controls chain reaction (control rods) 
D)   transfers heat from the condenser to the environment (cooling tower) 
E)   undergoes fission (fuel rods) F) B) and E)
G) A) and E)

Question 8

Complete and balance the nuclear equation  1224Mg+24He→01n+{ }_{12}^{24} \mathrm{Mg}+{ }_{2}^{4} \mathrm{He} \rightarrow{ }_{0}^{1} \mathrm{n}+1224​Mg+24​He→01​n+  ________

Accepted Answer

A)    1427Si{ }_{14}^{27} \mathrm{Si}1427​Si 
B)    1327Al{ }_{13}^{27} \mathrm{Al}1327​Al 
C)    1428Si{ }_{14}^{28} \mathrm{Si}1428​Si 
D)    1528P{ }_{15}^{28} \mathrm{P}1528​P 
E)   None of the above F) All of the above
G) A) and D)

Question 9

Balance the equation  01n+4097Zr→?+11H.{ }_{0}^{1} \mathrm{n}+{ }_{40}^{97} \mathrm{Zr} \rightarrow ?+{ }_{1}^{1} \mathrm{H} .01​n+4097​Zr→?+11​H.

Accepted Answer

A)    3998^{98}_{39}3998​ Y
B)    3897{ }_{38}^{97}3897​ Y
C)    3897{ }_{38}^{97}3897​ Y
D)    3896{ }_{38}^{96}3896​ Y
E)   None of the above F) B) and C)
G) All of the above

Question 10

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.  13H→23He+−10β{ }_{1}^{3} \mathrm{H} \rightarrow{ }_{2}^{3} \mathrm{He}+{ }_{-1}^{0} \mathrm{\beta}13​H→23​He+−10​β

Accepted Answer

A)   0.029 yr
B)   7.4 yr
C)   9.1 yr
D)   16 yr
E)   35 yr F) All of the above
G) A) and C)

Question 11

Balance the equation  92235U+01n→?+4097Zr+261n.{ }_{92}^{235} \mathrm{U}+{ }_{0}^{1} \mathrm{n} \rightarrow ?+{ }_{40}^{97} \mathrm{Zr}+2{ }_{6}^{1} \mathrm{n} .92235​U+01​n→?+4097​Zr+261​n.

Accepted Answer

A)    52135Te{ }_{52}^{135} \mathrm{Te}52135​Te 
B)    52137Te{ }_{52}^{137} \mathrm{Te}52137​Te 
C)    50137Sn{ }_{50}^{137} \mathrm{Sn}50137​Sn 
D)    50135Sn{ }_{50}^{135} \mathrm{Sn}50135​Sn 
E)   None of the above F) A) and E)
G) B) and D)

Question 12

Consider the following decay series:  84218Po→a82214 Pb→ b83214Bi→c84214Po→ d82210 Pb{ }_{84}^{218} \mathrm{Po} \xrightarrow{\mathrm{a}}{ }_{82}^{214} \mathrm{~Pb} \xrightarrow{\mathrm{~b}}{ }_{83}^{214} \mathrm{Bi} \xrightarrow{\mathrm{c}}{ }_{84}^{214} \mathrm{Po} \xrightarrow{\mathrm{~d}}{ }_{82}^{210} \mathrm{~Pb}84218​Poa​82214​ Pb b​83214​Bic​84214​Po d​82210​ Pb  Which type of nuclear process occurs in steps c and d, respectively

Accepted Answer

A)   aemission, a emission
B)   aemission, b emission
C)   bemission, positron emission
D)   bemission, a emission
E)   positron emission, b emission F) A) and D)
G) All of the above

Question 13

The Rb-87/Sr-87 method of dating rocks is often used by geologists:  3787Rb→3887Sr+−10β{ }_{37}^{87} \mathrm{Rb} \rightarrow{ }_{38}^{87} \mathrm{Sr}+{ }_{-1}^{0} \mathrm{\beta}3787​Rb→3887​Sr+−10​β  t1/2 = 6.0 * 1010 yr.Estimate the age of a rock sample in which the present-day mole ratio of Rb-87 to Sr-87 is 36:1.

Accepted Answer

A)   2.4 * 109 yr
B)   1.7 * 109 yr
C)   3.1 * 1011 yr
D)   4.1 * 10-11 yr
E)   3.6 * 1011 yr F) A) and D)
G) A) and B)

Question 14

As a result of beta decay, the product nucleus is

Accepted Answer

A)   one atomic number lower than the original element.
B)   two atomic numbers higher than the original element.
C)   one atomic number higher than the original element.
D)   two atomic numbers lower than the original element.
E)   four atomic numbers lower than the original element.F) None of the above
G) A) and C)

Question 15

Consider the following decay series:  What type of nuclear process occurs at the transformation labeled II

Accepted Answer

A)   aemission
B)   bemission
C)   positron emission
D)   electron capture
E)   gamma radiationF) D) and E)
G) A) and E)

Question 16

A typical radius of an atomic nucleus is about

Accepted Answer

A)   100 µm
B)   5000 mm
C)   100 nm
D)   5 * 10-3 pm
E)   500 pmF) A) and B)
G) A) and C)

Question 17

Decay of tin-110 by electron capture yields

Accepted Answer

A)   tin-109.
B)   cadmium-106.
C)   indium-110.
D)   antimony-110.
E)   tellurium-114.F) A) and E)
G) None of the above

Question 18

Consider the following decay series:  What type of nuclear process occurs at the transformation labeled I

Accepted Answer

A)   aemission
B)   bemission
C)   positron emission
D)   electron capture
E)   gamma radiationF) None of the above
G) D) and E)

Question 19

A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. The half-life of the decay series U-238  →\rarr→  Pb-206 is 4.5 * 109 yr. Assuming no Pb-206 was present in the rock initially, how old is the rock

Accepted Answer

A)   1.7 * 109 yr
B)   5.2 * 109 yr
C)   2.7 * 106 yr
D)   4.5 * 109 yr
E)   2.4 * 109 yr F) A) and C)
G) B) and E)

Question 20

On a plot of the number of neutrons versus the number of protons, a nucleus of aluminum-28 lies above the belt of stability. During the radioactive decay of aluminum-28 a beta particle is emitted, what isotope is also formed

Accepted Answer

A)    1429Si{ }_{14}^{29} \mathrm{Si}1429​Si 
B)    1327Al{ }_{13}^{27} \mathrm{Al}1327​Al 
C)    1428Si{ }_{14}^{28} \mathrm{Si}1428​Si 
D)    1528P{ }_{15}^{28} P1528​P 
E)   None of the above F) B) and D)
G) A) and C)

Exam 19: Nuclear Chemistry

Decay of ruthenium-93 by positron emission yields

Correct Answer
verified

Balance the equation ${ }_{92}^{235} \mathrm{U}+{ }_{0}^{1} \mathrm{n} \rightarrow ?+{ }_{40}^{97} \mathrm{Zr}+2{ }_{6}^{1} \mathrm{n} .$

Correct Answer
verified

A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. The half-life of the decay series U-238 $\rarr$ Pb-206 is 4.5 * 10⁹ yr. Assuming no Pb-206 was present in the rock initially, how old is the rock

Correct Answer
verified

Consider the following decay series: What type of nuclear process occurs at the transformation labeled I

Correct Answer
verified

Balance the equation ${ }_{0}^{1} \mathrm{n}+{ }_{40}^{97} \mathrm{Zr} \rightarrow ?+{ }_{1}^{1} \mathrm{H} .$

Correct Answer
verified

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

Correct Answer
verified

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. ${ }_{1}^{3} \mathrm{H} \rightarrow{ }_{2}^{3} \mathrm{He}+{ }_{-1}^{0} \mathrm{\beta}$

Correct Answer
verified

Find the nuclear binding energy of potassium-40 (atomic mass = 39.9632591 amu) in units of joules per nucleon. [Data: neutron mass = 1.674928 * 10^-24 g; proton mass = 1.672623 * 10^-24g; electron mass = 9.109387 * 10^-28 g; N_A = 6.0221367 * 10²³ /mol; c = 2.99792458 * 10⁸ m/s]

Correct Answer
verified

Decay of tin-110 by electron capture yields

Correct Answer
verified

On a plot of the number of neutrons versus the number of protons, a nucleus of aluminum-28 lies above the belt of stability. During the radioactive decay of aluminum-28 a beta particle is emitted, what isotope is also formed

Correct Answer
verified

Compared to chemical reactions nuclear reactions, in terms of the quantity of energy released, have approximately one thousand times greater energy production for comparable amounts.

Correct Answer
verified

As a result of beta decay, the product nucleus is

Correct Answer
verified

A plot of the number of neutrons versus the number of protons in various isotopes produces a "belt of stability." Isotopes below the belt of stability (i.e., with a smaller neutron-to-proton ratio) decay by beta particle emission.

Correct Answer
verified

Complete and balance the nuclear equation ${ }_{12}^{24} \mathrm{Mg}+{ }_{2}^{4} \mathrm{He} \rightarrow{ }_{0}^{1} \mathrm{n}+$ ________

Correct Answer
verified

What role does cadmium metal (Cd) play in a nuclear reactor

Correct Answer
verified

Correct Answer
verified

A typical radius of an atomic nucleus is about

Correct Answer
verified

Consider the following decay series: What type of nuclear process occurs at the transformation labeled II

Correct Answer
verified

The Rb-87/Sr-87 method of dating rocks is often used by geologists: ${ }_{37}^{87} \mathrm{Rb} \rightarrow{ }_{38}^{87} \mathrm{Sr}+{ }_{-1}^{0} \mathrm{\beta}$ t_1/2 = 6.0 * 10¹⁰ yr.Estimate the age of a rock sample in which the present-day mole ratio of Rb-87 to Sr-87 is 36:1.

Correct Answer
verified

The definition of free radicals is molecular fragments having one or more unpaired electrons.

Correct Answer
verified

Exam 19: Nuclear Chemistry

Decay of ruthenium-93 by positron emission yields

Correct AnswerverifiedShow Answer

Balance the equation 92235U+01n→?+4097Zr+261n.{ }_{92}^{235} \mathrm{U}+{ }_{0}^{1} \mathrm{n} \rightarrow ?+{ }_{40}^{97} \mathrm{Zr}+2{ }_{6}^{1} \mathrm{n} .92235​U+01​n→?+4097​Zr+261​n.

Correct AnswerverifiedShow Answer

A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. The half-life of the decay series U-238 →\rarr→ Pb-206 is 4.5 * 109 yr. Assuming no Pb-206 was present in the rock initially, how old is the rock

Correct AnswerverifiedShow Answer

Consider the following decay series: What type of nuclear process occurs at the transformation labeled I

Correct AnswerverifiedShow Answer

Balance the equation 01n+4097Zr→?+11H.{ }_{0}^{1} \mathrm{n}+{ }_{40}^{97} \mathrm{Zr} \rightarrow ?+{ }_{1}^{1} \mathrm{H} .01​n+4097​Zr→?+11​H.

Correct AnswerverifiedShow Answer

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

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. 13H→23He+−10β{ }_{1}^{3} \mathrm{H} \rightarrow{ }_{2}^{3} \mathrm{He}+{ }_{-1}^{0} \mathrm{\beta}13​H→23​He+−10​β

Correct AnswerverifiedShow Answer

Find the nuclear binding energy of potassium-40 (atomic mass = 39.9632591 amu) in units of joules per nucleon. [Data: neutron mass = 1.674928 * 10-24 g; proton mass = 1.672623 * 10-24g; electron mass = 9.109387 * 10-28 g; NA = 6.0221367 * 1023 /mol; c = 2.99792458 * 108 m/s]

Correct AnswerverifiedShow Answer

Decay of tin-110 by electron capture yields

Correct AnswerverifiedShow Answer

On a plot of the number of neutrons versus the number of protons, a nucleus of aluminum-28 lies above the belt of stability. During the radioactive decay of aluminum-28 a beta particle is emitted, what isotope is also formed

Correct AnswerverifiedShow Answer

Compared to chemical reactions nuclear reactions, in terms of the quantity of energy released, have approximately one thousand times greater energy production for comparable amounts.

Correct AnswerverifiedShow Answer

As a result of beta decay, the product nucleus is

Correct AnswerverifiedShow Answer

A plot of the number of neutrons versus the number of protons in various isotopes produces a "belt of stability." Isotopes below the belt of stability (i.e., with a smaller neutron-to-proton ratio) decay by beta particle emission.

Correct AnswerverifiedShow Answer

Complete and balance the nuclear equation 1224Mg+24He→01n+{ }_{12}^{24} \mathrm{Mg}+{ }_{2}^{4} \mathrm{He} \rightarrow{ }_{0}^{1} \mathrm{n}+1224​Mg+24​He→01​n+ ________

Correct AnswerverifiedShow Answer

What role does cadmium metal (Cd) play in a nuclear reactor

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A typical radius of an atomic nucleus is about

Correct AnswerverifiedShow Answer

Consider the following decay series: What type of nuclear process occurs at the transformation labeled II

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The definition of free radicals is molecular fragments having one or more unpaired electrons.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Balance the equation ${ }_{92}^{235} \mathrm{U}+{ }_{0}^{1} \mathrm{n} \rightarrow ?+{ }_{40}^{97} \mathrm{Zr}+2{ }_{6}^{1} \mathrm{n} .$

Correct Answer
verified

A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. The half-life of the decay series U-238 $\rarr$ Pb-206 is 4.5 * 10⁹ yr. Assuming no Pb-206 was present in the rock initially, how old is the rock

Correct Answer
verified

Correct Answer
verified

Balance the equation ${ }_{0}^{1} \mathrm{n}+{ }_{40}^{97} \mathrm{Zr} \rightarrow ?+{ }_{1}^{1} \mathrm{H} .$

Correct Answer
verified

Correct Answer
verified

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. ${ }_{1}^{3} \mathrm{H} \rightarrow{ }_{2}^{3} \mathrm{He}+{ }_{-1}^{0} \mathrm{\beta}$

Correct Answer
verified

Find the nuclear binding energy of potassium-40 (atomic mass = 39.9632591 amu) in units of joules per nucleon. [Data: neutron mass = 1.674928 * 10^-24 g; proton mass = 1.672623 * 10^-24g; electron mass = 9.109387 * 10^-28 g; N_A = 6.0221367 * 10²³ /mol; c = 2.99792458 * 10⁸ m/s]

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Complete and balance the nuclear equation ${ }_{12}^{24} \mathrm{Mg}+{ }_{2}^{4} \mathrm{He} \rightarrow{ }_{0}^{1} \mathrm{n}+$ ________

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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