Question 1

What is the typical percent of uranium- 235 in the enriched UO2 pellets used in nuclear reactors
__________ ?

Accepted Answer

A)  0.7 
B)  1 
C)  3 
D)  5 
E)  14 
A)  0.7 
B)  1 
C)  3 
D)  5 
E)  14 C

Question 2

In the nuclear transmutation represented by  , the emitted particle is .

Accepted Answer

A)  a beta particle. 
B)  a positron. 
C)  a neutron. 
D)  an alpha particle. 
E)  a proton. 
A)  a beta particle. 
B)  a positron. 
C)  a neutron. 
D)  an alpha particle. 
E)  a proton. D

Question 3

Which of the following correctly represents the transmutation in which a curium- 242 nucleus is bombarded with an alpha particle to produce a californium- 245 nucleus?

Accepted Answer

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

Question 4

At approximately what number of protons, or neutrons, does the 1:
1 ratio of protons to neutrons start to produce unstable nuclei?

Accepted Answer

A)  30 
B)  50 
C)  10 
D)  80 
E)  20 
A)  30 
B)  50 
C)  10 
D)  80 
E)  20

Question 5

The largest number of stable nuclei have an _ number of protons and an number of neutrons.

Accepted Answer

A)  even, even 
B)  odd, even 
C)  odd, odd 
D)  even, equal 
E)  even, odd 
A)  even, even 
B)  odd, even 
C)  odd, odd 
D)  even, equal 
E)  even, odd

Question 6

All atoms of a given element have the same

Accepted Answer

A)  atomic mass. 
B)  atomic number. 
C)  number of nucleons. 
D)  number of neutrons. 
E)  mass number. 
A)  atomic mass. 
B)  atomic number. 
C)  number of nucleons. 
D)  number of neutrons. 
E)  mass number.

Question 7

High speed electrons emitted by an unstable nucleus are _ .

Accepted Answer

The answer of High speed electrons emitted by an unstable...

Question 8

The nuclear disintegration series of is the source of radon- 222 in soil.

Accepted Answer

A) . 236Pb 
B) . 235U 
C)  .14C 
D)  .238U 
E)  .235Th 
A) . 236Pb 
B) . 235U 
C)  .14C 
D)  .238U 
E)  .235Th

Question 9

A rock contains 0.313 mg of lead- 206 for each milligram of uranium- 238. The half- life of for the decay of uranium- 238 to lead- 206 is 4.5 × 109 yr. The rock was formed yr ago.

Accepted Answer

A)  2.00 × 109  
B)  1.39 × 109  
C)  1.56 × 109  
D)  1.41 × 109  
E)  1.08 × 109 
A)  2.00 × 109  
B)  1.39 × 109  
C)  1.56 × 109  
D)  1.41 × 109  
E)  1.08 × 109

Question 10

Potassium- 40 decays to argon- 40 with a half- life of 1.27 × 109 yr. The age of a mineral sample that has a mass ratio of 40Ar to 40K of 0.812 is _ _ yr.

Accepted Answer

A)  1.09 × 109  
B)  1.56 × 109  
C)  1.02 × 109  
D)  7.55 × 108  
E)  1.47 × 109 
A)  1.09 × 109  
B)  1.56 × 109  
C)  1.02 × 109  
D)  7.55 × 108  
E)  1.47 × 109

Question 11

The SI unit of an absorbed dose of radiation is the gray.

Accepted Answer

A) True 
 B)False

Question 12

The use of radioisotopes in tracing metabolism is possible because

Accepted Answer

all isotopes of an e

Question 13

How many neutrons are emitted when a californium- 249 nucleus (Z=98) is bombarded with a nitrogen- 15 nucleus to produce a   nucleus ?

Accepted Answer

A)  three 
B)  one 
C)  zero 
D)  two 
E)  four 
A)  three 
B)  one 
C)  zero 
D)  two 
E)  four

Question 14

What drives the turbine in a nuclear power plant ?

Accepted Answer

A)  the primary coolant 
B)  steam 
C)  UF6 gas 
D)  the control rods 
E)  the moderator 
A)  the primary coolant 
B)  steam 
C)  UF6 gas 
D)  the control rods 
E)  the moderator

Question 15

What happens to the atomic mass number and the atomic number of a radioisotope when it undergoes alpha emission?

Accepted Answer

The mass number drop

Question 16

If we start with 1.000 g of strontium- 90, 0.908 g will remain after 4.00 yr. This means that the half- life of strontium- 90 is _ yr.

Accepted Answer

A)  28.8 
B)  4.40 
C)  41.6 
D)  3.63 
E)  3.05 
A)  28.8 
B)  4.40 
C)  41.6 
D)  3.63 
E)  3.05

Question 17

Bombardment of uranium- 238 with a deuteron (hydrogen- 2) generates neptunium- 237 and
Neutrons.

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 18

Carbon- 11 is used in medical imaging. The half- life of this radioisotope is 20.4 min. What percentage of a sample remains after 60.0 min?

Accepted Answer

A)  13.0 
B)  71.2 
C)  34.0 
D)  2.94 
E)  5.28 
A)  13.0 
B)  71.2 
C)  34.0 
D)  2.94 
E)  5.28

Question 19

Which one of the following is a correct representation of a beta particle?

Accepted Answer

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

Question 20

Who is credited with first achieving fission of uranium- 235 ?

Accepted Answer

A)  Faraday 
B)  Rutherford 
C)  Fermi 
D)  Curie 
E)  Dalton 
A)  Faraday 
B)  Rutherford 
C)  Fermi 
D)  Curie 
E)  Dalton

Exam 21: Nuclear Chemistry

What is the typical percent of uranium- 235 in the enriched UO2 pellets used in nuclear reactors __________ ?

In the nuclear transmutation represented by , the emitted particle is .

Which of the following correctly represents the transmutation in which a curium- 242 nucleus is bombarded with an alpha particle to produce a californium- 245 nucleus?

At approximately what number of protons, or neutrons, does the 1: 1 ratio of protons to neutrons start to produce unstable nuclei?

The largest number of stable nuclei have an _ number of protons and an number of neutrons.

All atoms of a given element have the same

High speed electrons emitted by an unstable nucleus are _ .

The nuclear disintegration series of is the source of radon- 222 in soil.

A rock contains 0.313 mg of lead- 206 for each milligram of uranium- 238. The half- life of for the decay of uranium- 238 to lead- 206 is 4.5 × 109 yr. The rock was formed yr ago.

Potassium- 40 decays to argon- 40 with a half- life of 1.27 × 109 yr. The age of a mineral sample that has a mass ratio of 40Ar to 40K of 0.812 is _ _ yr.

The SI unit of an absorbed dose of radiation is the gray.

The use of radioisotopes in tracing metabolism is possible because

How many neutrons are emitted when a californium- 249 nucleus (Z=98) is bombarded with a nitrogen- 15 nucleus to produce a nucleus ?

What drives the turbine in a nuclear power plant ?

What happens to the atomic mass number and the atomic number of a radioisotope when it undergoes alpha emission?

If we start with 1.000 g of strontium- 90, 0.908 g will remain after 4.00 yr. This means that the half- life of strontium- 90 is _ yr.

Bombardment of uranium- 238 with a deuteron (hydrogen- 2) generates neptunium- 237 and Neutrons.

Carbon- 11 is used in medical imaging. The half- life of this radioisotope is 20.4 min. What percentage of a sample remains after 60.0 min?

Which one of the following is a correct representation of a beta particle?

Who is credited with first achieving fission of uranium- 235 ?

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Gases

Intermolecular Forces, Liquids, and Solids

Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Chemistry of Coordination Compounds

The Chemistry of Life: Organic and Biological Chemistry

Filters

What is the typical percent of uranium- 235 in the enriched UO₂pellets used in nuclear reactors __________ ?

A rock contains 0.313 mg of lead- 206 for each milligram of uranium- 238. The half- life of for the decay of uranium- 238 to lead- 206 is 4.5 × 10⁹yr. The rock was formed yr ago.

Potassium- 40 decays to argon- 40 with a half- life of 1.27 × 10⁹yr. The age of a mineral sample that has a mass ratio of ⁴⁰Ar to ⁴⁰K of 0.812 is _ _ yr.