Nuclear reactions- fission, fusion and chain reactions.

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1. What's a chain reaction?

  • 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, neutrons released in the reaction undergo fission
  • when in a fission reaction nuclei are formed, the energy released stimulates other nuclei to undergo a fission reaction
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2. Fusion occurs when-

  • small nuclei join to make large ones
  • one big nuclei splits to form two daughter nuclei
  • you mess around injecting things with odd stuff you probably shouldn't even be near
  • pigs fly,it's not happened yet

3. Why is fusion difficult?

  • 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
  • Because scientists haven't yet figured out how it works
  • 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
  • Trick question!

4. If a chain reaction isn't controlled-

  • there will be a risk of fire
  • there'll be a nuclear explosion
  • living things will become ill
  • it prevents any of these other options

5. 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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