Question 1

The isotope of iodine with mass number 128 undergoes beta decay with a half-life of 25.00 minutes. How long will it take for 93.75% of a sample of pure 128 I to decay?

Accepted Answer

Question 2

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 pm.F) B) and D)
G) B) and E)

Question 3

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.  3H, content 60% that of freshly bottled wine. Tritium decays by beta decay and has a half-life of 12.3 yr.   A) 0.029 yr B) 7.4 yr C) 9.1 yr D) 16 yr E) 35 yr" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

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

Question 4

The Rb-87/Sr-87 method of dating rocks is often used by geologists: 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. 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" class="answers-bank-image d-inline" rel="preload" > 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 yrF) C) and D)
G) B) and E)

Question 5

Compare nuclear reactions with chemical reactions in terms of the quantity of energy released.

Accepted Answer

Nuclear reactions release far ...

Question 6

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

Accepted Answer

A)  2.97 * 10-10 J/nucleon
B)  3.04 * 10-10 J/nucleon
C)  1.30 * 10-12 J/nucleon
D)  1.22 * 10-12 J/nucleon
E)  1.27 * 10-12 J/nucleonF) A) and E)
G) A) and D)

Question 7

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

Accepted Answer

4.4 * 10<s...

Question 8

Lead-209 undergoes beta decay. Write a balanced equation for this reaction.

Accepted Answer

The answer of Lead-209 undergoes beta decay. Write a balanced...

Question 9

Complete and balance the nuclear equation  .

Accepted Answer

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

Question 10

Balance the equation  .

Accepted Answer

The answer of Balance the equation  ....

Question 11

The alpha particles emitted by radon-222 have an energy of 8.8 * 10-13 J. If a 200. g Pb brick absorbs 1.0 * 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 12

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) All of the above
G) B) and C)

Question 13

What nuclear fuel is produced in a breeder reactor?

Accepted Answer

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

Question 14

In the uranium-238 decay series there are eight radioisotopes starting with  that decay by alpha emission, and six 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)    .
B)    .
C)    .
D)    .
E)  none of these.F) A) and B)
G) C) and D)

Question 15

Tritium is a radioisotope of hydrogen having a half-life of 12.3 years. If you initially had 1.0 * 10-7 mole of tritium, how many moles of tritium would be left after 78 years?

Accepted Answer

1.2 * 10<s...

Question 16

The following nuclear equation is correctly balanced.

Accepted Answer

A) True 
 B)False

Question 17

A radioisotope decays to give an alpha particle and Pb-208. What was the original element?

Accepted Answer

A)  Se
B)  Bi
C)  Po
D)  Hg
E)  RnF) B) and D)
G) B) and E)

Question 18

What would the atom ratio of 206Pb to 238U be in a uranium mineral from a rock that is 1.0 * 109 years old? t1/2(238U) = 4.5 * 109 yr.

Accepted Answer

A)  0.14
B)  0.16
C)  0.22
D)  0.86
E)  1.16F) B) and E)
G) A) and B)

Question 19

Which type of radiation is the least penetrating?

Accepted Answer

A)  alpha
B)  beta
C)  gammaD) None of the above
E) A) and B)

Question 20

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 B)

Exam 21: Nuclear Chemistry

Which type of radiation is the least penetrating?

Correct AnswerverifiedShow Answer

Lead-209 undergoes beta decay. Write a balanced equation for this reaction.

Correct AnswerverifiedShow Answer

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

Correct Answerverified4.4 * 10View AnswerShow 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

The following nuclear equation is correctly balanced.

Correct AnswerverifiedShow Answer

Tritium is a radioisotope of hydrogen having a half-life of 12.3 years. If you initially had 1.0 * 10-7 mole of tritium, how many moles of tritium would be left after 78 years?

Correct Answerverified1.2 * 10View AnswerShow Answer

The Rb-87/Sr-87 method of dating rocks is often used by geologists: 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.

Correct AnswerverifiedShow Answer

In the uranium-238 decay series there are eight radioisotopes starting with that decay by alpha emission, and six radioisotopes that decay by beta emission. The final product of this series is a stable isotope. The symbol for this product is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Decay of ruthenium-93 by positron emission yields

Correct AnswerverifiedShow Answer

What would the atom ratio of 206Pb to 238U be in a uranium mineral from a rock that is 1.0 * 109 years old? t1/2(238U) = 4.5 * 109 yr.

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.

Correct AnswerverifiedShow Answer

Compare nuclear reactions with chemical reactions in terms of the quantity of energy released.

Correct AnswerverifiedNuclear reactions release far ...View AnswerShow Answer

Balance the equation .

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What nuclear fuel is produced in a breeder reactor?

Correct AnswerverifiedShow Answer

The isotope of iodine with mass number 128 undergoes beta decay with a half-life of 25.00 minutes. How long will it take for 93.75% of a sample of pure 128 I to decay?

Correct AnswerverifiedShow Answer

A typical radius of an atomic nucleus is about

Correct AnswerverifiedShow Answer

Complete and balance the nuclear equation .

Correct AnswerverifiedShow Answer

A radioisotope decays to give an alpha particle and Pb-208. What was the original element?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified
4.4 * 10
View 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 Answer
verified

Correct Answer
verified

Tritium is a radioisotope of hydrogen having a half-life of 12.3 years. If you initially had 1.0 * 10^-7 mole of tritium, how many moles of tritium would be left after 78 years?

Correct Answer
verified
1.2 * 10
View Answer

The Rb-87/Sr-87 method of dating rocks is often used by geologists: t_1/2 = 6.0 * 10¹⁰yr 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

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

What would the atom ratio of ²⁰⁶Pb to ²³⁸U be in a uranium mineral from a rock that is 1.0 * 10⁹ years old? t_1/2(²³⁸U) = 4.5 * 10⁹ yr.

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.

Correct Answer
verified

Correct Answer
verified
Nuclear reactions release far ...
View Answer

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

The isotope of iodine with mass number 128 undergoes beta decay with a half-life of 25.00 minutes. How long will it take for 93.75% of a sample of pure ¹²⁸I to decay?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified