Chapter 25 Review
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Transcript of Chapter 25 Review
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Chapter 25 ReviewSolutions
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Which of the following particles cannot be stopped by metal foil?
a. Alpha b. Beta c. Gamma
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Which particle of radiation carries the greatest amount of energy?
a. Alpha b. Beta c. Gamma
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Which particle in the following nuclear reaction is the parent nuclide?
HeNanAl 42
2411
10
2713
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True or False. All nuclear decay reactions are considered transmutation reactions.
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Which element is used in a nuclear fusion reactor? Hydrogen or Uranium
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Which variable(s) must be conserved in a nuclear reaction?
Mass numberThe number of protonsThe number of neutronsThe atomic numberThe type of atoms
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Which nuclear process is more likely to occur when the mass number is over 60? Fission or Fusion
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When is positron emission most effective? the neutron to proton ratio is above the band of stability
the neutron to proton ratio is below the band of stability
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When is alpha decay most effective? the neutron to proton ratio is above the band of stability
the neutron to proton ratio is below the band of stability
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When is electron capture most effective? When there is an excess of protons
When there is an excess of neutrons
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What changes in a nuclear equation when a nucleus undergoes beta decay? (choose all)
A. Mass number B. Atomic number C. the number of neutrons
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What is a positron?
A positron is a particle that has the mass of a beta particle and a charge of +1
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What is required to sustain a chain reaction?
a. High temperature b. Critical mass c. Water
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Is Calcium-45 a stable isotope of calcium? Yes or No If your answer is no, what type of decay would it undergo
Beta
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Sodium-20 is an unstable isotope of sodium. What two types of decay might it undergo?
Electron capture or positron emission
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Above what atomic number do most unstable atoms undergo alpha decay?
83
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Write the induced transmutation reaction for the alpha bombardment of Thorium 230 which produces two neutrons, a beta particle and another nuclide.
h𝑇 + 𝐻𝑒→2 𝑛+ 𝛽+ 𝑁𝑝93232
−10
01
24
90230
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If the half-life of a radioactive isotope is 12 minutes and 1 hour and 36 minutes passes, how many half-lives have taken place?What fraction of the sample will remain after that time?
1/256
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If a radioactive isotope decays from 16g to 2g in 15 days, what is the isotope’s half-life?
5 Days
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How much of a 20g sample of Zn-65 will remain after 18 years if the half- life of Zn-65 is 6 years?
2.5g
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What is the daughter nuclide in the following reaction?
nCmHePu 10
24296
42
23994