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Final

01:160:161 Chapter Notes - Chapter 21: Radioactive Decay, Joule, Beta ParticleExam


Department
Chemistry
Course Code
01:160:161
Professor
Asbed Vassilia
Study Guide
Final

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1
B&O CHAPTER 21
NUCLEAR CHEMISTRY
Problems to prepare students for Chem 162 final exam.
RADIOACTIVE DECAY PARTICLES AND RAYS
RADIOACTIVE DECAY KINETICS
NUCLEAR BINDING ENERGY
MISCELLANEOUS
E. Tavss, PhD

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CHAPTER 20 - THE NUCLEUS
RADIOACTIVE DECAY PARTICLES AND RAYS
48 Chem 162-2011 Final exam
Chapter 19 – The Nucleus
Radioactive decay particles and rays
Which type of radioactive decay results in no change in mass number or atomic number?
A. Alpha emission
B. Gamma emission
C. Beta emission
D. Positron emission
E. Electron capture
A. alpha emission 42He Change in mass number and atomic number
B. gamma emission 00γ No change in mass number or atomic number
C. beta emission 0-1e No change in mass number ; change in atomic number
D. positron emission 0+1e No change in mass number ; change in atomic number
E. electron capture 0-1e No change in mass number; change in atomic number

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3
8 Chem 162-2011 Final exam
Chapter 19 – The Nucleus
Radioactive decay particles and rays
Carbon has two stable isotopes, carbon-12 and carbon-13. Carbon-11 is unstable and is most
likely to undergo:
A. alpha decay
B. beta decay
C. either positron emission or electron capture
D. fission
E. fusion
Carbon-11 has the lowest mass number, but equal atomic number. Therefore, it has the fewest
neutrons. Therefore, it has a low neutron to proton ratio relative to the stable isotopes.
A. False. Alpha decay is the most common of mode of decay for nuclides with atomic number
greater than bismuth (83 protons).
B. False. Beta decay is the most common decay for nuclides with high neutron to proton ratio.
C. True. The most common types of decay for a nuclide with low neutron to proton ratio is
either electron capture or positron emission.
D. False. Fission is a reaction exhibited by atoms larger than Fe-56.
E. False. Fusion is a reaction for atoms smaller than Fe-56. However, requires an extremely
high temperature, which is not achievable except under extraordinary circumstances.
Chem 162-2010 Final Exam + Answers
Chapter 19 - The Nucleus
Radioactive decay particles and rays
6. The stable isotopes of lead are Pb-204, Pb-206, and Pb-208. The unstable isotope Pb-214 is most
likely to undergo
A. electron capture
B. neutron emission
C. α particle emission
D. β particle emission
E. positron emission
Except for hydrogen (11H), which has 0 neutrons and 1 proton, stable isotopes have a ratio of
approximately 1 neutron:1proton, to 1.5 neutrons:1 proton.
Pb-204 has a ratio of (122/82=) 1.49 neutrons to 1 proton.
Pb-206 has a ratio of (124/82=) 1.51 neutrons to 1 proton.
Pb-208 has a ratio of (126/82=) 1.54 neutrons to 1 proton
Pb-214 has a ratio of (132/82=) 1.61 neutrons to 1 proton
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