Question 1

Choose the correct word to describe the nuclear stability of the following isotope.If it is radioactive,choose the most likely mode of decay.
19F

Accepted Answer

A) radioactive,beta 
B) radioactive,fission 
C) radioactive,alpha 
D) radioactive,neutron 
E) stable 
A) radioactive,beta 
B) radioactive,fission 
C) radioactive,alpha 
D) radioactive,neutron 
E) stable

Question 2

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

Accepted Answer

A) electron microscope 
B) bubble or cloud chamber 
C) film 
D) Geiger counter 
E) Geiger-M   ller counter 
A) electron microscope 
B) bubble or cloud chamber 
C) film 
D) Geiger counter 
E) Geiger-M   ller counter

Question 3

The beta decay of   Na produces an isotope of ________.

Accepted Answer

A) Al 
B) Mg 
C) Na 
D) Ne 
E) O 
A) Al 
B) Mg 
C) Na 
D) Ne 
E) O

Question 4

Odd proton,odd neutron isotopes are generally more stable than even proton,even neutron isotopes.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following is FALSE?

Accepted Answer

A) A β- particle is essentially an e- originating from the nucleus. 
B) A β- decay results in a decrease in atomic number. 
C) A β- decay is accompanied by the emission of a neutrino. 
D) A β+ decay converts a proton to a neutron in the nucleus of an atom. 
E) An e- capture converts a proton to a neutron in the nucleus of an atom. 
A) A β- particle is essentially an e- originating from the nucleus. 
B) A β- decay results in a decrease in atomic number. 
C) A β- decay is accompanied by the emission of a neutrino. 
D) A β+ decay converts a proton to a neutron in the nucleus of an atom. 
E) An e- capture converts a proton to a neutron in the nucleus of an atom.

Question 6

The charcoal from ashes found in a cave gave 3.34 14C counts per gram per minute.Wood from the outer portion of a growing tree gives a comparable count of 16.0.The half-life of 14C is 5700 years.How old are the ashes?

Accepted Answer

A) 8.93 × 103 yr 
B) 6.87 × 103 yr 
C) 1.29 × 104 yr 
D) 1.93 × 104 yr 
E) 1.90 × 104 yr 
A) 8.93 × 103 yr 
B) 6.87 × 103 yr 
C) 1.29 × 104 yr 
D) 1.93 × 104 yr 
E) 1.90 × 104 yr

Question 7

Ion production is the way radiation causes the most damage.

Accepted Answer

A) True 
 B)False

Question 8

205Pb + ________ → 205Tl.

Accepted Answer

A)    n 
B)    He 
C)    β 
D) gamma 
E)    β 
A)    n 
B)    He 
C)    β 
D) gamma 
E)    β

Question 9

Fusion is the process of combining small nuclei into larger nuclei.

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

A)    P and   β 
B)    Si and   β 
C)    S and   β 
D)    Mg and 2   β 
A)    P and   β 
B)    Si and   β 
C)    S and   β 
D)    Mg and 2   β

Question 11

In the case of radioactive element X,which decays by electron emission with a half-life of 4 days to a stable nuclide of element Z:

Accepted Answer

A) 2 g of element X is required to produce 1.5 g of element Z after 8 days 
B) element Z will weigh considerably less than element X after decay is complete because of the loss of electrons 
C) element Z will weigh more than element X when decay is complete since Z has the higher atomic number 
D) after 8 days the sample will consist of one-fourth element Z and three-fourths element X 
E) after 8 days element X will be all element Z 
A) 2 g of element X is required to produce 1.5 g of element Z after 8 days 
B) element Z will weigh considerably less than element X after decay is complete because of the loss of electrons 
C) element Z will weigh more than element X when decay is complete since Z has the higher atomic number 
D) after 8 days the sample will consist of one-fourth element Z and three-fourths element X 
E) after 8 days element X will be all element Z

Question 12

Choose the INCORRECT statement.

Accepted Answer

A) An isotope that will fission when hit by a neutron is said to be fertile. 
B) A moderator slows down neutrons. 
C) Control rods absorb energy to control the fission reaction. 
D) Electrons dislodged from an atom or molecule by alpha or beta particles are called primary electrons. 
E) Radiation exposes photographic film the same as light. 
A) An isotope that will fission when hit by a neutron is said to be fertile. 
B) A moderator slows down neutrons. 
C) Control rods absorb energy to control the fission reaction. 
D) Electrons dislodged from an atom or molecule by alpha or beta particles are called primary electrons. 
E) Radiation exposes photographic film the same as light.

Question 13

An employee at a chemical laboratory studying radioisotopes would wear a badge to keep a check on the amount of radiation to which he is exposed.This radiation dosage would be measured in the unit:

Accepted Answer

A) curie 
B) rad 
C) rem 
D) joules 
E) joules per kilogram 
A) curie 
B) rad 
C) rem 
D) joules 
E) joules per kilogram

Question 14

Radioactive decay series decay by alpha and positron emission.

Accepted Answer

A) True 
 B)False

Question 15

Neptunium-239 has a half-life of 2.35 days.How many days must elapse for a sample of 239Np to decay to 0.100% of its original quantity?

Accepted Answer

A) 0.0427 days 
B) 1.491 days 
C) 2.04 days 
D) 23.4 days 
A) 0.0427 days 
B) 1.491 days 
C) 2.04 days 
D) 23.4 days

Question 16

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.

Accepted Answer

A) I and II 
B) I,II,and III 
C) I and III 
D) I,III,and IV 
E) II,III,and IV 
A) I and II 
B) I,II,and III 
C) I and III 
D) I,III,and IV 
E) II,III,and IV

Question 17

Transuranium elements can be produced by bombarding nuclei with:

Accepted Answer

A) neutrons 
B) other nuclei 
C) alpha particles 
D) positrons 
E) neutrons and/or other nuclei 
A) neutrons 
B) other nuclei 
C) alpha particles 
D) positrons 
E) neutrons and/or other nuclei

Question 18

Find the INCORRECT nuclear reaction.

Accepted Answer

A)    U +   n →   Ba +   Kr + 3   n 
B)    Pu +   n→   Cs +   Y 
C)    U +   n →   Th +   He 
D)    U +   n →   Ba +   Kr +   n 
E)    U +   n →   U 
A)    U +   n →   Ba +   Kr + 3   n 
B)    Pu +   n→   Cs +   Y 
C)    U +   n →   Th +   He 
D)    U +   n →   Ba +   Kr +   n 
E)    U +   n →   U

Question 19

Which of the following elements would be expected to be particularly stable?

Accepted Answer

A)    C 
B)    B 
C)    Be 
D)    Li 
A)    C 
B)    B 
C)    Be 
D)    Li

Question 20

In the following process,what is the missing particle?

________ +   He →   O +   P

Accepted Answer

A)    N 
B)    F 
C)    N 
D)    F 
E)    O 
A)    N 
B)    F 
C)    N 
D)    F 
E)    O

Exam 25: Nuclear Chemistry

Choose the correct word to describe the nuclear stability of the following isotope.If it is radioactive,choose the most likely mode of decay. 19F

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

The beta decay of Na produces an isotope of ________.

Odd proton,odd neutron isotopes are generally more stable than even proton,even neutron isotopes.

Which of the following is FALSE?

The charcoal from ashes found in a cave gave 3.34 14C counts per gram per minute.Wood from the outer portion of a growing tree gives a comparable count of 16.0.The half-life of 14C is 5700 years.How old are the ashes?

Ion production is the way radiation causes the most damage.

205Pb + ________ → 205Tl.

Fusion is the process of combining small nuclei into larger nuclei.

Consider the following nuclear reactions. Al + He → 1+N1 → Si + 2 What are the nuclides 1 and 2,respectively?

In the case of radioactive element X,which decays by electron emission with a half-life of 4 days to a stable nuclide of element Z:

Choose the INCORRECT statement.

An employee at a chemical laboratory studying radioisotopes would wear a badge to keep a check on the amount of radiation to which he is exposed.This radiation dosage would be measured in the unit:

Radioactive decay series decay by alpha and positron emission.

Neptunium-239 has a half-life of 2.35 days.How many days must elapse for a sample of 239Np to decay to 0.100% of its original quantity?

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.

Transuranium elements can be produced by bombarding nuclei with:

Find the INCORRECT nuclear reaction.

Which of the following elements would be expected to be particularly stable?

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

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

Filters

Choose the correct word to describe the nuclear stability of the following isotope.If it is radioactive,choose the most likely mode of decay. ¹⁹F

The charcoal from ashes found in a cave gave 3.34 ¹⁴C counts per gram per minute.Wood from the outer portion of a growing tree gives a comparable count of 16.0.The half-life of ¹⁴C is 5700 years.How old are the ashes?

²⁰⁵Pb + ________ → ²⁰⁵Tl.

Neptunium-239 has a half-life of 2.35 days.How many days must elapse for a sample of ²³⁹Np to decay to 0.100% of its original quantity?