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Chapter 25 Review Solutions
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Which of the following particles cannot be stopped by metal foil? a. Alphab. Betac. Gamma
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Which particle of radiation carries the greatest amount of energy? a. Alphab. Betac. Gamma
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Which particle in the following nuclear reaction is the parent nuclide ?
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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 number The number of protons The number of neutrons The atomic number The 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.
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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?
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