Question 1

What percentage of a radioactive substance remains after 7.00 half-lives have elapsed?

Accepted Answer

A) 0.391% 
B) 0.78% 
C) 1.56% 
D) 3.12% 
A) 0.391% 
B) 0.78% 
C) 1.56% 
D) 3.12%

Question 2

The following reaction represents what nuclear process? 
 Pb → E + Bi

Accepted Answer

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

Question 3

Beta decay of 60Co produces a beta particle and ________.

Accepted Answer

A) (56Mn) 
B) (59Co) 
C) (60Fe) 
D) (60Ni) 
A) (56Mn) 
B) (59Co) 
C) (60Fe) 
D) (60Ni)

Question 4

Write a nuclear equation for the alpha decay of  Pu.

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 5

Which of the following statements is/are true?

Accepted Answer

A) Positrons are similar in ionizing power and penetrating power to beta particles. 
B) A positron is the antiparticle of the electron. 
C) Beta decay occurs when a neutron changes into a proton while emitting an electron. 
D) An alpha particle is a helium 2+ ion. 
E) All of the above are true. 
A) Positrons are similar in ionizing power and penetrating power to beta particles. 
B) A positron is the antiparticle of the electron. 
C) Beta decay occurs when a neutron changes into a proton while emitting an electron. 
D) An alpha particle is a helium 2+ ion. 
E) All of the above are true.

Question 6

Match the following.
-alpha particle

Accepted Answer

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

Question 7

Match the following.
-electron

Accepted Answer

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

Question 8

Strontium-90 is a by-product in nuclear reactors fueled by the radioisotope uranium-235.The half-life of strontium-90 is 28.8 yr.What percentage of a strontium-90 sample remains after 75.0 yr?

Accepted Answer

A) 68.1 
B) 16.5 
C) 7.40 
D) 38.4 
E) 2.60 
A) 68.1 
B) 16.5 
C) 7.40 
D) 38.4 
E) 2.60

Question 9

Match the following.
-positron

Accepted Answer

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

Question 10

Identify the missing particle in the following nuclear equation: 
 Th → He + ?

Accepted Answer

A)   U 
B)   Ac 
C)   Ac 
D)   Ra 
E)   Ra 
A)   U 
B)   Ac 
C)   Ac 
D)   Ra 
E)   Ra

Question 11

In a nuclear process,a neutron collides with a uranium-235 atom producing three neutrons,a Ba-139 and a Kr-94 atom.What is this nuclear process?

Accepted Answer

A) fission 
B) fusion 
C) alpha decay 
D) beta decay 
A) fission 
B) fusion 
C) alpha decay 
D) beta decay

Question 12

Which of the following statements are true?

Accepted Answer

A) If N/Z ratio is too high,there are too many protons and the nuclide will undergo positron emission or electron capture. 
B) If N/Z ratio lies somewhere below 1,the nuclide is stable. 
C) If N/Z ratio is too low,there are too many neutrons and the nuclide will undergo beta decay. 
D) The valley of stability is the geographic location where many of the known nuclides were first discovered. 
E) None of the above are true. 
A) If N/Z ratio is too high,there are too many protons and the nuclide will undergo positron emission or electron capture. 
B) If N/Z ratio lies somewhere below 1,the nuclide is stable. 
C) If N/Z ratio is too low,there are too many neutrons and the nuclide will undergo beta decay. 
D) The valley of stability is the geographic location where many of the known nuclides were first discovered. 
E) None of the above are true.

Question 13

Describe what is meant by the "valley of stability."

Accepted Answer

If a plot of number of neutrons vs.numbe

Question 14

Determine the identity of the daughter nuclide from the positron emission of  N.

Accepted Answer

A)   O 
B)   C 
C)   O 
D)   B 
E)   F 
A)   O 
B)   C 
C)   O 
D)   B 
E)   F

Question 15

The number of nucleons in a  Co nucleus is ________.

Accepted Answer

A) 27 
B) 33 
C) 60 
D) 87 
A) 27 
B) 33 
C) 60 
D) 87

Question 16

The half-life of cobalt-60 is 5.20 yr.How many milligrams of a 2.000-mg sample remain after 6.55 years?

Accepted Answer

A) 0.837 
B) 3.23 × 10-15 
C) 4.779 
D) 1.588 
E) 1.163 
A) 0.837 
B) 3.23 × 10-15 
C) 4.779 
D) 1.588 
E) 1.163

Question 17

Identify the energy source of the stars.

Accepted Answer

A) nuclear fusion 
B) alpha emission 
C) beta emission 
D) nuclear fission 
E) neutron capture 
A) nuclear fusion 
B) alpha emission 
C) beta emission 
D) nuclear fission 
E) neutron capture

Question 18

Which of the following nuclides are most likely to decay via beta decay?

Accepted Answer

A) I-131 
B) Ar-40 
C) F-18 
D) Zr-90 
E) Pb-206 
A) I-131 
B) Ar-40 
C) F-18 
D) Zr-90 
E) Pb-206

Question 19

Match the following.
-proton

Accepted Answer

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

Question 20

Determine the identity of the daughter nuclide from the electron capture by  Cl.

Accepted Answer

A)   Ar 
B)   K 
C)   S 
D)   P 
E)   Ar 
A)   Ar 
B)   K 
C)   S 
D)   P 
E)   Ar

What percentage of a radioactive substance remains after 7.00 half-lives have elapsed?

The following reaction represents what nuclear process? Pb →E +Bi

Beta decay of ⁶⁰Co produces a beta particle and ________.

Write a nuclear equation for the alpha decay of Pu.

Which of the following statements is/are true?

Match the following. -alpha particle

Match the following. -electron

Strontium-90 is a by-product in nuclear reactors fueled by the radioisotope uranium-235.The half-life of strontium-90 is 28.8 yr.What percentage of a strontium-90 sample remains after 75.0 yr?

Match the following. -positron

Identify the missing particle in the following nuclear equation: Th →He + ?

In a nuclear process,a neutron collides with a uranium-235 atom producing three neutrons,a Ba-139 and a Kr-94 atom.What is this nuclear process?

Which of the following statements are true?

Describe what is meant by the "valley of stability."

Determine the identity of the daughter nuclide from the positron emission of N.

The number of nucleons in a Conucleusis ________.

The half-life of cobalt-60 is 5.20 yr.How many milligrams of a 2.000-mg sample remain after 6.55 years?

Identify the energy source of the stars.

Which of the following nuclides are most likely to decay via beta decay?

Match the following. -proton

Determine the identity of the daughter nuclide from the electron capture by Cl.

Matter, Measurement, and Problem Solving

Atoms and Elements

Molecules, Compounds and Chemical Equations

Chemical Quantities and Aqueous Reactions

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and

Liquids, Solids, and Intermolecular Forces

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Chemical Equilibrium

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Exam 19: Radioactivity and Nuclear Chemistry

What percentage of a radioactive substance remains after 7.00 half-lives have elapsed?

The following reaction represents what nuclear process? Pb →E +Bi

Beta decay of 60Co produces a beta particle and ________.

Write a nuclear equation for the alpha decay of Pu.

Which of the following statements is/are true?

Match the following. -alpha particle

Match the following. -electron

Strontium-90 is a by-product in nuclear reactors fueled by the radioisotope uranium-235.The half-life of strontium-90 is 28.8 yr.What percentage of a strontium-90 sample remains after 75.0 yr?

Match the following. -positron

Identify the missing particle in the following nuclear equation: Th →He + ?

In a nuclear process,a neutron collides with a uranium-235 atom producing three neutrons,a Ba-139 and a Kr-94 atom.What is this nuclear process?

Which of the following statements are true?

Describe what is meant by the "valley of stability."

Determine the identity of the daughter nuclide from the positron emission of N.

The number of nucleons in a Co nucleus is ________.

The half-life of cobalt-60 is 5.20 yr.How many milligrams of a 2.000-mg sample remain after 6.55 years?

Identify the energy source of the stars.

Which of the following nuclides are most likely to decay via beta decay?

Match the following. -proton

Determine the identity of the daughter nuclide from the electron capture by Cl.

Matter, Measurement, and Problem Solving

Atoms and Elements

Molecules, Compounds and Chemical Equations

Chemical Quantities and Aqueous Reactions

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Filters

Beta decay of ⁶⁰Co produces a beta particle and ________.

The number of nucleons in a Conucleusis ________.