Question 1

What fraction of radioactive atoms remains in a sample after six half-lives?

Accepted Answer

A) zero 
B) 1/6 
C) 1/16 
D) 1/32 
E) 1/64 
A) zero 
B) 1/6 
C) 1/16 
D) 1/32 
E) 1/64

Question 2

Radioactive nitrogen-13 has a half-life of 10 minutes. After 40 minutes, how much of this isotope would remain in a sample that originally contained 96 mg?

Accepted Answer

The answer of Radioactive nitrogen-13 has a half-life of 10...

Question 3

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. 
A) tin-109. 
B) cadmium-106. 
C) indium-110. 
D) antimony-110. 
E) tellurium-114.

Question 4

The half-life of 14C is 5,730 yr. Assuming some charcoal from a campfire 29,000 years old was found, what fraction of the original C-14 would remain today?

Accepted Answer

A) 3.0 * 10-2 
B) 0.197 
C) 3.51 
D) 33.3 
E) None of these. 
A) 3.0 * 10-2 
B) 0.197 
C) 3.51 
D) 33.3 
E) None of these.

Question 5

The only stable isotope of aluminum is aluminum-27. What type of radioactive decay should be expected from   ?

Accepted Answer

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

Question 6

Decay of silicon-27 by positron emission yields

Accepted Answer

A) magnesium-23. 
B) sulfur-31. 
C) phosphorus-27. 
D) silicon-26. 
E) aluminum-27. 
A) magnesium-23. 
B) sulfur-31. 
C) phosphorus-27. 
D) silicon-26. 
E) aluminum-27.

Question 7

When atoms of aluminum-27 are bombarded with alpha particles, a neutron and an element are produced. The particular isotope formed is

Accepted Answer

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

Question 8

Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in petroleum have been in the ground for 100 million years, what fraction of the initial 14C atoms is still there? (t1/2 = 5,370 yr)

Accepted Answer

A) 0 
B) 1 * 10-10 
C) 5.7 * 10-5 
D) 1.0 * 10-3 
E) 5.7 * 10-1 
A) 0 
B) 1 * 10-10 
C) 5.7 * 10-5 
D) 1.0 * 10-3 
E) 5.7 * 10-1

Question 9

Balance the equation

Accepted Answer

The answer of Balance the equation  ...

Question 10

Complete and balance the nuclear equation   .

Accepted Answer

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

Question 11

In the following reaction, identify X.

Accepted Answer

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

Question 12

A sample of a radioisotope shows an activity of 999 disintegrations per minute due to beta decay. If after 1.10 years the activity is 952 disintegrations per minute, what is the half-life of this radioisotope?

Accepted Answer

A) 4.38 * 10-2 yr 
B) 11.4 yr 
C) 0.25 yr 
D) 15.8 yr 
E) 9.1 yr 
A) 4.38 * 10-2 yr 
B) 11.4 yr 
C) 0.25 yr 
D) 15.8 yr 
E) 9.1 yr

What fraction of radioactive atoms remains in a sample after six half-lives?

Radioactive nitrogen-13 has a half-life of 10 minutes. After 40 minutes, how much of this isotope would remain in a sample that originally contained 96 mg?

Decay of tin-110 by electron capture yields

The half-life of ¹⁴C is 5,730 yr. Assuming some charcoal from a campfire 29,000 years old was found, what fraction of the original C-14 would remain today?

The only stable isotope of aluminum is aluminum-27. What type of radioactive decay should be expected from ?

Decay of silicon-27 by positron emission yields

When atoms of aluminum-27 are bombarded with alpha particles, a neutron and an element are produced. The particular isotope formed is

Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in petroleum have been in the ground for 100 million years, what fraction of the initial ¹⁴C atoms is still there? (t_1/2 = 5,370 yr)

Balance the equation

Complete and balance the nuclear equation .

In the following reaction, identify X.

A sample of a radioisotope shows an activity of 999 disintegrations per minute due to beta decay. If after 1.10 years the activity is 952 disintegrations per minute, what is the half-life of this radioisotope?

Introduction

Atoms, Molecules, and Ions

Stoichiometry

Reactions in Aqueous Solution

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Organic Polymerssynthetic and Natural

Filters

Exam 21: Nuclear Chemistry

What fraction of radioactive atoms remains in a sample after six half-lives?

Radioactive nitrogen-13 has a half-life of 10 minutes. After 40 minutes, how much of this isotope would remain in a sample that originally contained 96 mg?

Decay of tin-110 by electron capture yields

The half-life of 14C is 5,730 yr. Assuming some charcoal from a campfire 29,000 years old was found, what fraction of the original C-14 would remain today?

The only stable isotope of aluminum is aluminum-27. What type of radioactive decay should be expected from ?

Decay of silicon-27 by positron emission yields

When atoms of aluminum-27 are bombarded with alpha particles, a neutron and an element are produced. The particular isotope formed is

Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in petroleum have been in the ground for 100 million years, what fraction of the initial 14C atoms is still there? (t1/2 = 5,370 yr)

Balance the equation

Complete and balance the nuclear equation .

In the following reaction, identify X.

A sample of a radioisotope shows an activity of 999 disintegrations per minute due to beta decay. If after 1.10 years the activity is 952 disintegrations per minute, what is the half-life of this radioisotope?

Introduction

Atoms, Molecules, and Ions

Stoichiometry

Reactions in Aqueous Solution

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Organic Polymerssynthetic and Natural

Filters

The half-life of ¹⁴C is 5,730 yr. Assuming some charcoal from a campfire 29,000 years old was found, what fraction of the original C-14 would remain today?

Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in petroleum have been in the ground for 100 million years, what fraction of the initial ¹⁴C atoms is still there? (t_1/2 = 5,370 yr)