Question 1

e represents ________.

Accepted Answer

beta emiss

Question 2

Stable nuclei with low atomic numbers, up to 20, have a neutron to proton ratio of approximately ________.

Accepted Answer

The answer of Stable nuclei with low atomic numbers, up...

Question 3

The half-life of 218Po is 3.1 minutes. How much of a 170 gram sample remains after 0.64 hours?

Accepted Answer

A) 0.032 g 
B) 150 g 
C) 31 g 
D) 4.7 × 10-10 g 
E) None of the original sample will remain. 
A) 0.032 g 
B) 150 g 
C) 31 g 
D) 4.7 × 10-10 g 
E) None of the original sample will remain.

Question 4

The half-life for the beta decay of potassium-40 is 1.3 × 109 years. What is the rate constant for this decay?

Accepted Answer

t_1/2 = 0.693/k 1.3 × 10

Question 5

In balancing the nuclear reaction   Br → E +   e, the identity of element E is ________.

Accepted Answer

A) Kr 
B) Br 
C) U 
D) Se 
E) none of the above 
A) Kr 
B) Br 
C) U 
D) Se 
E) none of the above

Question 6

What happens to the atomic mass number and the atomic number of a radioisotope when it undergoes alpha emission?

Accepted Answer

The mass number drop

Question 7

Consider the following data for a particular radionuclide:  
-What is the half-life (in min)of this radionuclide?

Accepted Answer

A) 0.024 
B) 0.022 
C) 32 
D) 0.032 
E) 45 
A) 0.024 
B) 0.022 
C) 32 
D) 0.032 
E) 45

Question 8

What is the missing product from this reaction?   P →   S + _____

Accepted Answer

A)    He 
B)    e 
C)    γ 
D)    e 
E)    p 
A)    He 
B)    e 
C)    γ 
D)    e 
E)    p

Question 9

The beta decay of cesium-137 has a half-life of 30.0 years. How many years must pass to reduce a 30 mg sample of cesium 137 to 5.2 mg?

Accepted Answer

A) 76 years 
B) -76 years 
C) 38 years 
D) 0.040 years 
E) 25 years 
A) 76 years 
B) -76 years 
C) 38 years 
D) 0.040 years 
E) 25 years

Question 10

Which one of the following is a correct representation of beta particle?

Accepted Answer

A)    e 
B)    γ 
C)    e 
D)    He 
A)    e 
B)    γ 
C)    e 
D)    He

Question 11

131I has a half-life of 8.04 days. Assuming you start with a 1.03 mg sample of 131I, how many mg will remain after 13.0 days?

Accepted Answer

A) 0.326 
B) 0.268 
C) 0.422 
D) 0.0781 
E) 0.336 
A) 0.326 
B) 0.268 
C) 0.422 
D) 0.0781 
E) 0.336

Question 12

Which type of radioactive decay results in no change in mass number and atomic number for the starting nucleus?

Accepted Answer

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

Question 13

The mass of a proton is 1.00728 amu and that of a neutron is 1.00867 amu. What is the mass defect (in amu)of a   Ni nucleus? (The mass of a nickel-60 nucleus is 59.9308 amu.)

Accepted Answer

A) 0.5449 
B) 1.2374 
C) 0.5491 
D) 28.7930 
E) 1.3066 
A) 0.5449 
B) 1.2374 
C) 0.5491 
D) 28.7930 
E) 1.3066

Question 14

The half-life of 223Ra is 11.4 days. How much of a 200.0 mg sample remains after 600 hours?

Accepted Answer

A) 0.219 mg 
B) 21.9 mg 
C) .0302 mg 
D) 43.8 mg 
E) 6.04 mg 
A) 0.219 mg 
B) 21.9 mg 
C) .0302 mg 
D) 43.8 mg 
E) 6.04 mg

Question 15

Which one of the following is a correct representation of an alpha particle?

Accepted Answer

A)    He 
B)    H 
C)    H 
D)    e 
E)    H 
A)    He 
B)    H 
C)    H 
D)    e 
E)    H

Question 16

What is the largest number of protons that can exist in a nucleus and still be stable?

Accepted Answer

A) 206 
B) 50 
C) 92 
D) 83 
E) 84 
A) 206 
B) 50 
C) 92 
D) 83 
E) 84

Question 17

The half-life for beta decay of strontium-90 is 28.8 years. A milk sample is found to contain 10.3 ppm strontium-90. How many years would pass before the strontium-90 concentration would drop to 1.0 ppm?

Accepted Answer

A) 92.3 
B) 0.112 
C) 186 
D) 96.9 
E) 131 
A) 92.3 
B) 0.112 
C) 186 
D) 96.9 
E) 131

Question 18

The decay of a radionuclide with a half-life of 3.3 × 105 years has a rate constant (in yr-1)equal to ________.

Accepted Answer

A) 4.8 × 105 
B) 2.1 × 10-6 
C) 4.2 × 10-6 
D) 2.8 × 103 
E) 5.9 × 10-8 
A) 4.8 × 105 
B) 2.1 × 10-6 
C) 4.2 × 10-6 
D) 2.8 × 103 
E) 5.9 × 10-8

Question 19

Gamma radiation only changes the atomic number but not the mass number of a nucleus.

Accepted Answer

A) True 
 B)False

Question 20

The missing product from this reaction is ________.   I → _____ +   e

Accepted Answer

A)    Te 
B)    Xe 
C)    Te 
D)    e 
E) none of the above 
A)    Te 
B)    Xe 
C)    Te 
D)    e 
E) none of the above

Exam 21: Nuclear Chemistry

e represents ________.

Stable nuclei with low atomic numbers, up to 20, have a neutron to proton ratio of approximately ________.

The half-life of 218Po is 3.1 minutes. How much of a 170 gram sample remains after 0.64 hours?

The half-life for the beta decay of potassium-40 is 1.3 × 109 years. What is the rate constant for this decay?

In balancing the nuclear reaction Br → E + e, the identity of element E is ________.

What happens to the atomic mass number and the atomic number of a radioisotope when it undergoes alpha emission?

Consider the following data for a particular radionuclide: -What is the half-life (in min)of this radionuclide?

What is the missing product from this reaction? P → S + _____

The beta decay of cesium-137 has a half-life of 30.0 years. How many years must pass to reduce a 30 mg sample of cesium 137 to 5.2 mg?

Which one of the following is a correct representation of beta particle?

131I has a half-life of 8.04 days. Assuming you start with a 1.03 mg sample of 131I, how many mg will remain after 13.0 days?

Which type of radioactive decay results in no change in mass number and atomic number for the starting nucleus?

The mass of a proton is 1.00728 amu and that of a neutron is 1.00867 amu. What is the mass defect (in amu)of a Ni nucleus? (The mass of a nickel-60 nucleus is 59.9308 amu.)

The half-life of 223Ra is 11.4 days. How much of a 200.0 mg sample remains after 600 hours?

Which one of the following is a correct representation of an alpha particle?

What is the largest number of protons that can exist in a nucleus and still be stable?

The half-life for beta decay of strontium-90 is 28.8 years. A milk sample is found to contain 10.3 ppm strontium-90. How many years would pass before the strontium-90 concentration would drop to 1.0 ppm?

The decay of a radionuclide with a half-life of 3.3 × 105 years has a rate constant (in yr-1)equal to ________.

Gamma radiation only changes the atomic number but not the mass number of a nucleus.

The missing product from this reaction is ________. I → _____ + e

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

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The half-life of ²¹⁸Po is 3.1 minutes. How much of a 170 gram sample remains after 0.64 hours?

The half-life for the beta decay of potassium-40 is 1.3 × 10⁹ years. What is the rate constant for this decay?

¹³¹I has a half-life of 8.04 days. Assuming you start with a 1.03 mg sample of ¹³¹I, how many mg will remain after 13.0 days?

The half-life of ²²³Ra is 11.4 days. How much of a 200.0 mg sample remains after 600 hours?

The decay of a radionuclide with a half-life of 3.3 × 10⁵ years has a rate constant (in yr^-1)equal to ________.

The missing product from this reaction is ____. I → _ + e