Which statement is true about this reaction?mc016-1.jpgIt is a practical source of energy on Earth.It occurs only outside the solar system.Its product is heavier than each of its reactants.It shows the critical mass of an element.
  • A
  • NOT D B
  • D
  • NOT A
Which best describes what forms in nuclear fusion?two smaller, more stable nucleitwo larger, less stable nucleione smaller, less stable nucleusone larger, more stable nucleus
  • B
  • NOT D B
  • A
  • NOT A
How does critical mass play a role in nuclear reactions?It is the minimum amount of material needed to start a fission reaction.It is the minimum amount of material needed to start a fusion reaction.It is the minimum amount of material needed to sustain a fission reaction.It is the minimum amount of material needed to sustain a fusion reaction.
  • A
  • D
  • B
  • C
Which best describes nuclear fission?A nucleus spontaneously splits and absorbs energy.Two nuclei spontaneously combine and absorb energy.A nucleus collides with a neutron and splits, releasing energy.Nuclei combine to form a heavier nucleus, releasing energy.
  • NOT A
  • NOT D B
  • A
  • D
Which type of reaction does this diagram represent?mc007-1.jpgnuclear fusion because nuclei combine to form a heavy nucleusnuclear fission because an atom is splitting into two large fragments of comparable massnuclear fusion because a large amount of energy is being releasednuclear fission because the resulting products are not radioactive
  • A
  • B
  • C
  • D
Why is it important for scientists to replicate each other's experiments?to determine if important scientific results are repeatableto help the research of other scientiststo determine if slight alterations in the experiment can affect the resultto further their own research
  • C
  • A
  • B
  • D
Which is a characteristic of nuclear fusion?produces radioactive wasteinvolves the collision of two nucleicommonly used by humans as an energy sourcerequires very little activation energy
  • A
  • D
  • NOT A
  • B
Research into nuclear fusion will likely require a large investment of time and money before it might be used as an energy source. Which statement best describes the benefits that would make the investment worthwhile?Fusion requires a large amount of energy and occurs in stars.Fusion produces large amounts of energy, and the fuel is found on Earth.Fusion produces no radioactive waste, and the fuel is plentiful.Fusion requires little energy to begin and would continue through a chain reaction.
  • NOT A
  • B
  • D
  • NOT D B
Which is a characteristic of nuclear fusion but NOT nuclear fission?releases large amounts of energyis the energy source of starsis used in electric power plantsrequires little energy to occur
  • A
  • B
  • C
  • D
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