The initial decay rate of a nuclide is 1.77 × 1012/m.After 7.63 d,the decay rate is 1.82 × 1011/m.What is the half-life of the isotope?

A) 139 d B) 0.298 d C) 0.207 d D) 2.32 d E) 2.50 d A) 139 d B) 0.298 d C) 0.207 d D) 2.32 d E) 2.50 d

The half-life of 238U,which decomposes to 206Pb,is 4.51 × 109 y.A rock contains equal masses of these two isotopes.How old is this rock?

A) 4.07 × 109 y B) 4.06 × 109 y C) 9.02 × 109 y D) 4.51 × 109 y E) 5.00 × 109 y A) 4.07 × 109 y B) 4.06 × 109 y C) 9.02 × 109 y D) 4.51 × 109 y E) 5.00 × 109 y

The following nuclear reaction is known to occur: 2 H → He This reaction is used in a fusion bomb or H bomb.How many joules of energy are produced by this reaction if 33.0 g of 2H are used? You are given the following masses: electron 0.00055 amu;proton 1.00782 amu;neutron 1.00867 amu;2H atom 2.010410 amu; He atom 4.00260 amu.

A) 3.82 × 10-12 J B) 2.30 × 1012 J C) 3.77 × 1013 J D) 7.60 × 1013 J E) 1.34 J A) 3.82 × 10-12 J B) 2.30 × 1012 J C) 3.77 × 1013 J D) 7.60 × 1013 J E) 1.34 J

There are three radioactive series: the thorium series,which begins with 232Th,the uranium series which starts with 238U and the actinium series which starts with what isotope?

A) (235U) B) (216Po) C) (221Rn) D) (214Pb) E) (226Ra) A) (235U) B) (216Po) C) (221Rn) D) (214Pb) E) (226Ra)

8Be → 4He + ________.

A) (3Be) B) (8He) C) (4He) D) (4Li) E) (12 C) A) (3Be) B) (8He) C) (4He) D) (4Li) E) (12 C)

What total energy is released when 0.75 grams of 235U undergo fission if each atom averages 3.2 × 10-11 J of energy released?

A) 1.45 × 1013 J B) 6.01 × 1031 J C) 6.15 × 1010 J D) 6.15 × 107 J E) 1.45 × 1010 J A) 1.45 × 1013 J B) 6.01 × 1031 J C) 6.15 × 1010 J D) 6.15 × 107 J E) 1.45 × 1010 J

A) (6H) B) (5He) C) (7He) D) (6Li) E) (7Be) A) (6H) B) (5He) C) (7He) D) (6Li) E) (7Be)

Exam 25: Nuclear Chemistry

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The charcoal from ashes found in a cave gave 7.4 ¹⁴C counts per gram per minute.Wood from the outer portion of a growing tree gives a comparable count of 15.3.The half-life of ¹⁴C is 5700 years.How old are the ashes?

(Multiple Choice)

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Question 81

Strontium-90 is a byproduct in nuclear reactors fuelled by the radioisotope uranium-235.The half-life Of strontium-90 Is 28.8 y.What percentage of a strontium-90 sample remains after 75.0 y?

(Multiple Choice)

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Question 82

The nuclear binding energy is the energy required to separate the neutrons and protons.

(True/False)

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Question 83

The initial decay rate of a nuclide is 1.77 × 10¹²/m.After 7.63 d,the decay rate is 1.82 × 10¹¹/m.What is the half-life of the isotope?

(Multiple Choice)

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Question 84

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

(Multiple Choice)

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Question 85

The half-life of ²³⁸U,which decomposes to ²⁰⁶Pb,is 4.51 × 10⁹ y.A rock contains equal masses of these two isotopes.How old is this rock?

(Multiple Choice)

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Question 86

The following nuclear reaction is known to occur: 2 H → He This reaction is used in a fusion bomb or H bomb.How many joules of energy are produced by this reaction if 33.0 g of ²H are used? You are given the following masses: electron 0.00055 amu;proton 1.00782 amu;neutron 1.00867 amu;²H atom 2.010410 amu; He atom 4.00260 amu.

(Multiple Choice)

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Question 87

There have been two ways of making transuranium elements: heavy-atom bombardment and:

(Multiple Choice)

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Question 88

In the following process,what is the missing particle? N + He → ________ + P

(Multiple Choice)

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Question 89

The half-life of cobalt-60 is 5.20 y.How many milligrams of a 1.000-mg sample remain after 6.55 years?

(Multiple Choice)

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Question 90

Which statement below is correct?

(Multiple Choice)

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Question 91

There have been two ways of making transuranium elements: neutron bombardment and:

(Multiple Choice)

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Question 92

There are three radioactive series: the thorium series,which begins with ²³²Th,the uranium series which starts with ²³⁸U and the actinium series which starts with what isotope?

(Multiple Choice)

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Question 93

Choose the INCORRECT statement.

(Multiple Choice)

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Question 94

Choose the correct word to describe the nuclear stability of the following isotope.If it is radioactive,choose the most likely mode of decay. ⁵⁰Mn

(Multiple Choice)

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Question 95

⁸Be → ⁴He + ________.

(Multiple Choice)

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Question 96

Nuclear binding energy is: I.the energy liberated when forming a nucleus II.related to "lost" mass by the relationship 1 amu = 28.4 MeV III.related to "lost" mass by the relationship 1 amu = 931.5 MeV IV.the force which holds the 3 atomic particles together

(Multiple Choice)

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Question 97

When a nitrogen nucleus containing six neutrons emits a positron,the product is ________.

(Multiple Choice)

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Question 98

What total energy is released when 0.75 grams of ²³⁵U undergo fission if each atom averages 3.2 × 10^-11 J of energy released?

(Multiple Choice)

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Question 99

⁶He → + ________.

(Multiple Choice)

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Question 100

Showing 81 - 100 of 116

Exam 25: Nuclear Chemistry

The charcoal from ashes found in a cave gave 7.4 14C counts per gram per minute.Wood from the outer portion of a growing tree gives a comparable count of 15.3.The half-life of 14C is 5700 years.How old are the ashes?

Strontium-90 is a byproduct in nuclear reactors fuelled by the radioisotope uranium-235.The half-life Of strontium-90 Is 28.8 y.What percentage of a strontium-90 sample remains after 75.0 y?

The nuclear binding energy is the energy required to separate the neutrons and protons.

The initial decay rate of a nuclide is 1.77 × 1012/m.After 7.63 d,the decay rate is 1.82 × 1011/m.What is the half-life of the isotope?

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

The half-life of 238U,which decomposes to 206Pb,is 4.51 × 109 y.A rock contains equal masses of these two isotopes.How old is this rock?

There have been two ways of making transuranium elements: heavy-atom bombardment and:

In the following process,what is the missing particle? N + He → ________ + P

The half-life of cobalt-60 is 5.20 y.How many milligrams of a 1.000-mg sample remain after 6.55 years?

Which statement below is correct?

There have been two ways of making transuranium elements: neutron bombardment and:

There are three radioactive series: the thorium series,which begins with 232Th,the uranium series which starts with 238U and the actinium series which starts with what isotope?

Choose the INCORRECT statement.

Choose the correct word to describe the nuclear stability of the following isotope.If it is radioactive,choose the most likely mode of decay. 50Mn

8Be → 4He + ________.

Nuclear binding energy is: I.the energy liberated when forming a nucleus II.related to "lost" mass by the relationship 1 amu = 28.4 MeV III.related to "lost" mass by the relationship 1 amu = 931.5 MeV IV.the force which holds the 3 atomic particles together

When a nitrogen nucleus containing six neutrons emits a positron,the product is ________.

What total energy is released when 0.75 grams of 235U undergo fission if each atom averages 3.2 × 10-11 J of energy released?

6He → + ________.

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

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The charcoal from ashes found in a cave gave 7.4 ¹⁴C counts per gram per minute.Wood from the outer portion of a growing tree gives a comparable count of 15.3.The half-life of ¹⁴C is 5700 years.How old are the ashes?

The initial decay rate of a nuclide is 1.77 × 10¹²/m.After 7.63 d,the decay rate is 1.82 × 10¹¹/m.What is the half-life of the isotope?

The half-life of ²³⁸U,which decomposes to ²⁰⁶Pb,is 4.51 × 10⁹ y.A rock contains equal masses of these two isotopes.How old is this rock?

There are three radioactive series: the thorium series,which begins with ²³²Th,the uranium series which starts with ²³⁸U and the actinium series which starts with what isotope?

Choose the correct word to describe the nuclear stability of the following isotope.If it is radioactive,choose the most likely mode of decay. ⁵⁰Mn

⁸Be → ⁴He + ________.

What total energy is released when 0.75 grams of ²³⁵U undergo fission if each atom averages 3.2 × 10^-11 J of energy released?

⁶He → + ________.