Question 1

When a 87Br nucleus emits a beta particle, the nuclear species that results is ___________.

Accepted Answer

Question 2

The only stable isotope of iodine is iodine-127. Predict the mode of decay of   I.

Accepted Answer

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

Question 3

Polonium-208 is an alpha emitter with a half-life of 2.90 years. How many milligrams of polonium from an original sample of 2.00 mg will remain after 8.00 years?

Accepted Answer

A) 0.147 mg 
B) 0.296 mg 
C) 0.725 mg 
D) 6.77 mg 
E) 1.90 mg 
A) 0.147 mg 
B) 0.296 mg 
C) 0.725 mg 
D) 6.77 mg 
E) 1.90 mg

Question 4

Predict which nucleus is less stable,   or   .

Accepted Answer

The answer of Predict which nucleus is less stable, ...

Question 5

The 14C activity of some ancient Peruvian corn was found to be 10 disintegrations per minute per gram of carbon. If present-day plant life shows 15 dpm/g, how old is the Peruvian corn? The half-life of 14C is 5730 yr.

Accepted Answer

A) 1,455 yr 
B) 1,910 yr 
C) 3,350 yr 
D) 3,820 yr 
E) 9,080 yr 
A) 1,455 yr 
B) 1,910 yr 
C) 3,350 yr 
D) 3,820 yr 
E) 9,080 yr

Question 6

Balance the equation   Rn     He + ? .

Accepted Answer

The answer of Balance the equation   Rn ...

Question 7

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 8

The dose unit of ionizing radiation is called the rad. The rad is defined in terms of

Accepted Answer

A) the half-life of a radioisotope. 
B) the energy deposited per gram of an object. 
C) the biological damage produced. 
D) the accumulation of fission products. 
E) the number of ions per centimeter. 
A) the half-life of a radioisotope. 
B) the energy deposited per gram of an object. 
C) the biological damage produced. 
D) the accumulation of fission products. 
E) the number of ions per centimeter.

Question 9

Protactinium-234 has a half-life of 1 minute.How much of a 400.g sample protactinium would remain after 1 minute?

Accepted Answer

The answer of Protactinium-234 has a half-life of 1 minute.How...

Question 10

The carbon-14 activity of some ancient Indian corn was found to be 7.0 disintegrations per minute (dpm)per gram of carbon. If present-day plant life has 16 dpm per gram of carbon, how old is the Indian corn? (t1/2 = 5,730 yr)

Accepted Answer

A) 6,800 yr 
B) 2,500 yr 
C) 4,700 yr 
D) 10,000 yr 
E) 7,200 yr 
A) 6,800 yr 
B) 2,500 yr 
C) 4,700 yr 
D) 10,000 yr 
E) 7,200 yr

Question 11

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 12

Sulfur-35 decays by beta emission. The decay product is

Accepted Answer

A)    P 
B)    S 
C)    Si 
D)    Cl 
E)    Cl 
A)    P 
B)    S 
C)    Si 
D)    Cl 
E)    Cl

Question 13

Protactinium-234 has a half-life of 1 minute.How much of a 400.g sample protactinium would remain after 4 minutes?

Accepted Answer

The answer of Protactinium-234 has a half-life of 1 minute.How...

Question 14

How many neutrons and protons (nucleons)does an atom with the symbol   have?

Accepted Answer

A) 33 
B) 16 
C) 49 
D) None of the above. 
A) 33 
B) 16 
C) 49 
D) None of the above.

Question 15

Protactinium-234 has a half-life of 1 minute.How much of a 400.g sample protactinium would remain after 2 minutes?

Accepted Answer

The answer of Protactinium-234 has a half-life of 1 minute.How...

Question 16

Calculate the binding energy per nucleon of an Al-27 nucleus given the following masses:   Al: 26.981541 amu;   H: 1.007838 amu;   n: 1.008665 amu.

Accepted Answer

1.34 @#LAT-DLM& 10<s

Question 17

A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. Approximately how many U-238 atoms were in the rock when it was formed billions of years ago? (The half life for 238U $\to$ 206Pb is 4.5 $\times$ 109 yr.)

Accepted Answer

A) 1.32 atoms 
B) 5.8 $\times$ 10-6 atoms 
C) 2.4 $\times$ 1018 atoms 
D) 3.5 $\times$ 1018 atoms 
E) 3.5 $\times$ 1021 atoms 
A) 1.32 atoms 
B) 5.8 $\times$ 10-6 atoms 
C) 2.4 $\times$ 1018 atoms 
D) 3.5 $\times$ 1018 atoms 
E) 3.5 $\times$ 1021 atoms

Question 18

Complete and balance the nuclear equation

Accepted Answer

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

Question 19

Which one of the following statements about fission and fusion is false?

Accepted Answer

A) Fission occurs among the heaviest isotopes, whereas fusion occurs more readily for light isotopes. 
B) For a fission reaction the mass defect ($\Delta$m)is negative, whereas for fusion $\Delta$m is positive. 
C) In order for fusion reactions to occur, temperatures must be in the millions of degrees. 
D) The fission of Pu-239 atoms produces a great number of isotopes of a large number of elements. 
E) Neutron-induced fission processes can occur at room temperature, rather than at millions of degrees. 
A) Fission occurs among the heaviest isotopes, whereas fusion occurs more readily for light isotopes. 
B) For a fission reaction the mass defect ($\Delta$m)is negative, whereas for fusion $\Delta$m is positive. 
C) In order for fusion reactions to occur, temperatures must be in the millions of degrees. 
D) The fission of Pu-239 atoms produces a great number of isotopes of a large number of elements. 
E) Neutron-induced fission processes can occur at room temperature, rather than at millions of degrees.

Question 20

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...

Exam 23: Nuclear Chemistry

When a 87Br nucleus emits a beta particle, the nuclear species that results is ___________.

The only stable isotope of iodine is iodine-127. Predict the mode of decay of I.

Polonium-208 is an alpha emitter with a half-life of 2.90 years. How many milligrams of polonium from an original sample of 2.00 mg will remain after 8.00 years?

Predict which nucleus is less stable, or .

The 14C activity of some ancient Peruvian corn was found to be 10 disintegrations per minute per gram of carbon. If present-day plant life shows 15 dpm/g, how old is the Peruvian corn? The half-life of 14C is 5730 yr.

Balance the equation Rn He + ? .

Decay of silicon-27 by positron emission yields

The dose unit of ionizing radiation is called the rad. The rad is defined in terms of

Protactinium-234 has a half-life of 1 minute.How much of a 400.g sample protactinium would remain after 1 minute?

The carbon-14 activity of some ancient Indian corn was found to be 7.0 disintegrations per minute (dpm)per gram of carbon. If present-day plant life has 16 dpm per gram of carbon, how old is the Indian corn? (t1/2 = 5,730 yr)

Decay of tin-110 by electron capture yields

Sulfur-35 decays by beta emission. The decay product is

Protactinium-234 has a half-life of 1 minute.How much of a 400.g sample protactinium would remain after 4 minutes?

How many neutrons and protons (nucleons)does an atom with the symbol have?

Protactinium-234 has a half-life of 1 minute.How much of a 400.g sample protactinium would remain after 2 minutes?

Calculate the binding energy per nucleon of an Al-27 nucleus given the following masses: Al: 26.981541 amu; H: 1.007838 amu; n: 1.008665 amu.

A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. Approximately how many U-238 atoms were in the rock when it was formed billions of years ago? (The half life for 238U →\to→ 206Pb is 4.5 ×\times× 109 yr.)

Complete and balance the nuclear equation

Which one of the following statements about fission and fusion is false?

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?

Chemistry: The Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solution

Gases

Thermo-Chemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Chemistry in the Atmosphere

Entropy, Free Energy, and Equilibrium

Electrochemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

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When a ⁸⁷Br nucleus emits a beta particle, the nuclear species that results is ___________.

The ¹⁴C activity of some ancient Peruvian corn was found to be 10 disintegrations per minute per gram of carbon. If present-day plant life shows 15 dpm/g, how old is the Peruvian corn? The half-life of ¹⁴C is 5730 yr.

The carbon-14 activity of some ancient Indian corn was found to be 7.0 disintegrations per minute (dpm)per gram of carbon. If present-day plant life has 16 dpm per gram of carbon, how old is the Indian corn? (t_1/2 = 5,730 yr)

A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238. Approximately how many U-238 atoms were in the rock when it was formed billions of years ago? (The half life for ²³⁸U $\to$ ²⁰⁶Pb is 4.5 $\times$ 10⁹ yr.)