A nuclide has a decay constant of 4.28 × 10-4/h. If the activity of a sample is 3.14 × 105/s, how many atoms of the nuclide are present in the sample?

A) 7.34 × 108 B) 2.64 × 1012 C) 4.84 × 105 D) 1.34 × 102 E) 2.34 × 1011 A) 7.34 × 108 B) 2.64 × 1012 C) 4.84 × 105 D) 1.34 × 102 E) 2.34 × 1011

Exam 25: Nuclear Chemistry 1-41

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In the reaction + → how much energy is produced per gram of carbon used? Masses, in unified atomic mass units are: = 12.00000, = 4.00260, = 15.99491. Express your answer in Joules/gram of carbon.

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Question 61

Choose the INCORRECT statement.

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Question 62

What is the decay constant for 131I if the half-life is 8.04 d?

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Question 63

The masses of , and are 4.0015, 6.0135 and 10.0102 amu, respectively. Splitting a boron-10 nucleus to helium-4 and lithium-6 would:

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Question 64

Half-life is: I) the time for a sample to decay completely. II) constant for a given radioisotope. III) the time required for half of a sample to decay. IV) inversely proportional to the decay constant.

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Question 65

Which of the following instruments would be least suitable for detecting particles given off in radioactive decay?

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Question 66

Most periodic tables indicate the elements for which all isotopes are radioactive. Which pair of elements with atomic number less than 83 have only radioactive isotopes?

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Question 67

A wooden artifact is subjected to radiocarbon dating. The activity associated with its 14C content is 12 dis min-1 g-1. A sample of wood from a modern source gave 15 dis min-1 g-1. If the half-life of 14C is 5730 y, what is the age of the artifact?

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Question 68

On forming the nuclide from the protons, neutrons and electrons, the mass loss per nucleon for the is 0.00759 amu, whereas that for is 0.00944 amu. This means that:

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Question 69

Consider the following nuclear reactions. + → 1 + 1 → + 2 What are the nuclides 1 and 2, respectively?

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Question 70

A certain radioactive series starts with and ends with . In the overall process, alpha particles and beta particles are emitted.

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Question 71

A nuclide has a decay constant of 4.28 × 10^-4/h. If the activity of a sample is 3.14 × 10⁵/s, how many atoms of the nuclide are present in the sample?

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Question 72

Which of the following is FALSE?

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Question 73

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

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Question 74

An isotope which has too high a neutron-proton ratio can gain stability by:

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Question 75

Cancerous cells are more easily killed by radiation than normal cells.

(True/False)

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Question 76

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?

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Question 77

When a nuclide undergoes positron emission, the change in the number of protons, neutrons, and mass number is, respectively,

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Question 78

Transuraniun elements are elements with atomic numbers greater than 92.

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Question 79

When undergoes positron emission, the product nucleus is ________.

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Question 80

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Exam 25: Nuclear Chemistry 1-41

In the reaction + → how much energy is produced per gram of carbon used? Masses, in unified atomic mass units are: = 12.00000, = 4.00260, = 15.99491. Express your answer in Joules/gram of carbon.

Choose the INCORRECT statement.

What is the decay constant for 131I if the half-life is 8.04 d?

The masses of , and are 4.0015, 6.0135 and 10.0102 amu, respectively. Splitting a boron-10 nucleus to helium-4 and lithium-6 would:

Half-life is: I) the time for a sample to decay completely. II) constant for a given radioisotope. III) the time required for half of a sample to decay. IV) inversely proportional to the decay constant.

Which of the following instruments would be least suitable for detecting particles given off in radioactive decay?

Most periodic tables indicate the elements for which all isotopes are radioactive. Which pair of elements with atomic number less than 83 have only radioactive isotopes?

A wooden artifact is subjected to radiocarbon dating. The activity associated with its 14C content is 12 dis min-1 g-1. A sample of wood from a modern source gave 15 dis min-1 g-1. If the half-life of 14C is 5730 y, what is the age of the artifact?

On forming the nuclide from the protons, neutrons and electrons, the mass loss per nucleon for the is 0.00759 amu, whereas that for is 0.00944 amu. This means that:

Consider the following nuclear reactions. + → 1 + 1 → + 2 What are the nuclides 1 and 2, respectively?

A certain radioactive series starts with and ends with . In the overall process, ________ alpha particles and ________ beta particles are emitted.

A nuclide has a decay constant of 4.28 × 10-4/h. If the activity of a sample is 3.14 × 105/s, how many atoms of the nuclide are present in the sample?

Which of the following is FALSE?

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

An isotope which has too high a neutron-proton ratio can gain stability by:

Cancerous cells are more easily killed by radiation than normal cells.

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?

When a nuclide undergoes positron emission, the change in the number of protons, neutrons, and mass number is, respectively,

Transuraniun elements are elements with atomic numbers greater than 92.

When undergoes positron emission, the product nucleus is ________.

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: Additional Aspects

Intermolecular Forces: Liquids and Solids

Solutions and Their Physical Properties

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements I: Groups 1, 2, 13, and 14

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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A certain radioactive series starts with and ends with . In the overall process, alpha particles and beta particles are emitted.

A nuclide has a decay constant of 4.28 × 10^-4/h. If the activity of a sample is 3.14 × 10⁵/s, how many atoms of the nuclide are present in the sample?