Nuclear reactions- fission, fusion and chain reactions.

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1. In a fission reaction-

  • a big, unstable nucleus can split into smaller ones when ,for example, absorbing a neutron
  • small nuclei combine to make big ones
  • an atom splits into two smaller ones
  • three nuclei split then combine into one
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Other questions in this quiz

2. Only one neutron from each _____ can cause another _____

  • chain reaction
  • fission
  • fusion
  • atom

3. What's a chain reaction?

  • when in a fission reaction nuclei are formed, neutrons released in the reaction undergo fission
  • I can't see a link to physics
  • when in a fission reaction the nucleus is formed, it splits and comes back together again
  • when in a fission reaction nuclei are formed, the energy released stimulates other nuclei to undergo a fission reaction

4. Why is fusion difficult?

  • Trick question!
  • Because scientists haven't yet figured out how it works
  • Nuclei have to be really close before it occurs, and as unless really high temperatures and pressures are reached to overcome this, the positive charges repel one another
  • Nuclei may blow up if they get to the correct heat and pressure for fusion,so there is a low chance of them being able to fuse

5. What kind of fusion was said by some scientists to have occurred in low temperatures?

  • No heat fusion
  • Cold fusion
  • Ice fusion
  • Who snows? (this is why we can't have nice things)

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