Question 1

The dose unit of ionizing radiation is called the rad. The rad is defined in terms of

Accepted Answer

A)  the half-life of a radioisotope.
B)  the energy deposited per gram of an object.
C)  the biological damage produced.
D)  the accumulation of fission products.
E)  the number of ions per centimeter.F) A) and C)
G) A) and D)

Question 2

Rubidium-87 decays by beta decay with a half-life of 4.9 * 1010 yr. How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3,500 disintegrations per hour?

Accepted Answer

A)  9.0 * 1016 atoms
B)  4.3 * 10-4 atoms
C)  2.2 * 1018 atoms
D)  2.5 * 1014 atoms
E)  1.7 * 1014 atomsF) A) and B)
G) C) and E)

Question 3

Protactinium-234 has a half-life of 1 minute. How much of a 400. g sample protactinium would remain after 1 minute?

Accepted Answer

The answer of Protactinium-234 has a half-life of 1 minute....

Question 4

Sulfur-35 decays by beta emission. The decay product is

Accepted Answer

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

Question 5

Calculate the binding energy per nucleon of an Al-27 nucleus given the following masses:  : 26.981541 amu;  : 1.007838 amu;  : 1.008665 amu.

Accepted Answer

1.34 * 10<...

Question 6

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

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) None of the above
G) B) and D)

Question 7

How many 14C atoms are in a charcoal sample that has a decay rate of 3,500 disintegrations per min? (For 14C, t1/2 = 5,730 yr.)

Accepted Answer

A)  2.9 * 107 atoms
B)  8.0 * 10-7 atoms
C)  1.4 * 1014 atoms
D)  1.5 * 1013 atoms
E)  6.02 * 1020 atomsF) B) and C)
G) A) and B)

Question 8

In the following reaction, identify X.

Accepted Answer

A)  ( α\alphaα ) 
B)  n
C)  p
D)   
E)  ( β\betaβ )  F) A) and B)
G) C) and E) B

Question 9

The energy released by the sun is the result of

Accepted Answer

A)  natural radioactivity.
B)  nuclear fusion.
C)  combustion of hydrogen.
D)  photosynthesis.
E)  nuclear fission.F) B) and E)
G) A) and D)

Question 10

Polonium-208 is an alpha emitter with a half-life of 2.90 years. How many milligrams of polonium from an original sample of 2.00 mg will remain after 8.00 years?

Accepted Answer

A)  0.147 mg
B)  0.296 mg
C)  0.725 mg
D)  6.77 mg
E)  1.90 mgF) C) and E)
G) A) and E)

Question 11

The only stable isotope of iodine is iodine-127. Predict the mode of decay of  .

Accepted Answer

A)  alpha emission
B)  beta emission
C)  positron emission
D)  electron captureE) A) and B)
F) All of the above

Question 12

Decay of lutetium-167 by electron capture yields

Accepted Answer

A)  ytterbium-167.
B)  lutetium-166.
C)  thulium-163.
D)  tantalum-171.
E)  hafnium-167.F) A) and E)
G) A) and C) A

Question 13

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 14

Predict which nucleus is less stable,  or  .

Accepted Answer

The answer of Predict which nucleus is less stable, ...

Question 15

Alpha particles are identical to

Accepted Answer

A)  protons.
B)  helium atoms.
C)  hydrogen atoms.
D)  helium nuclei.
E)  electrons.F) A) and E)
G) A) and B)

Question 16

Balance the equation  .

Accepted Answer

The answer of Balance the equation  ....

Question 17

Strontium-90 has a half-life of 28.8 years. How much strontium-90 was present initially, if after 144 years 10.0 g remain?

Accepted Answer

The answer of Strontium-90 has a half-life of 28.8 years....

Question 18

Balance the equation  .

Accepted Answer

The answer of Balance the equation  ....

Question 19

The half-life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175 years later?

Accepted Answer

A)  0.17
B)  0.12
C)  0.062
D)  0.015
E)  0.50F) B) and E)
G) A) and B) D

Question 20

Gamma-rays cause radiation damage when they interact with matter by producing

Accepted Answer

A)  ions and free radicals.
B)  isotopes.
C)  daughter products.
D)  oxidation.
E)  reduction.F) A) and C)
G) C) and E)

Exam 21: Nuclear Chemistry

The dose unit of ionizing radiation is called the rad. The rad is defined in terms of

Correct AnswerverifiedShow Answer

Rubidium-87 decays by beta decay with a half-life of 4.9 * 1010 yr. How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3,500 disintegrations per hour?

Correct AnswerverifiedShow Answer

Protactinium-234 has a half-life of 1 minute. How much of a 400. g sample protactinium would remain after 1 minute?

Correct AnswerverifiedShow Answer

Sulfur-35 decays by beta emission. The decay product is

Correct AnswerverifiedShow Answer

Calculate the binding energy per nucleon of an Al-27 nucleus given the following masses: : 26.981541 amu; : 1.007838 amu; : 1.008665 amu.

Correct Answerverified1.34 * 10<...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

How many 14C atoms are in a charcoal sample that has a decay rate of 3,500 disintegrations per min? (For 14C, t1/2 = 5,730 yr.)

Correct AnswerverifiedShow Answer

In the following reaction, identify X.

Correct AnswerverifiedB

The energy released by the sun is the result of

Correct AnswerverifiedShow Answer

Polonium-208 is an alpha emitter with a half-life of 2.90 years. How many milligrams of polonium from an original sample of 2.00 mg will remain after 8.00 years?

Correct AnswerverifiedShow Answer

The only stable isotope of iodine is iodine-127. Predict the mode of decay of .

Correct AnswerverifiedShow Answer

Decay of lutetium-167 by electron capture yields

Correct AnswerverifiedA

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

Predict which nucleus is less stable, or .

Correct AnswerverifiedShow Answer

Alpha particles are identical to

Correct AnswerverifiedShow Answer

Balance the equation .

Correct AnswerverifiedShow Answer

Strontium-90 has a half-life of 28.8 years. How much strontium-90 was present initially, if after 144 years 10.0 g remain?

Correct AnswerverifiedShow Answer

Balance the equation .

Correct AnswerverifiedShow Answer

The half-life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175 years later?

Correct AnswerverifiedD

Gamma-rays cause radiation damage when they interact with matter by producing

Correct AnswerverifiedShow Answer

Correct Answer
verified

Rubidium-87 decays by beta decay with a half-life of 4.9 * 10¹⁰ yr. How many ⁸⁷Rb atoms are in a moon rock sample that has a rubidium decay rate of 3,500 disintegrations per hour?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
1.34 * 10<...
View Answer

Correct Answer
verified

How many ¹⁴C atoms are in a charcoal sample that has a decay rate of 3,500 disintegrations per min? (For ¹⁴C, t_1/2 = 5,730 yr.)

Correct Answer
verified

In the following reaction, identify X. $In the following reaction, identify X. A) ( \alpha ) B) n C) p D) E) ( \beta )$

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The half-life of ⁹⁰Sr is 29 years. What fraction of the atoms in a sample of ⁹⁰Sr would remain 175 years later?

Correct Answer
verified
D

Correct Answer
verified