Nuclear reactions- fission, fusion and chain reactions.

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1. In a fission reaction-

  • an atom splits into two smaller ones
  • a big, unstable nucleus can split into smaller ones when ,for example, absorbing a neutron
  • small nuclei combine to make big ones
  • three nuclei split then combine into one
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2. Fusion occurs when-

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

3. In 1989 scientists said they made fusion happen at 50 degrees celsius. Why?

  • because the experiment took place in space
  • other
  • there isn't any proof they did, so their experiments aren't valid. They could've lied or pulled of something really amazing but we'll never know.
  • because the experiment took place at the bottom of the ocean

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

  • chain reaction
  • fission
  • fusion
  • atom

5. Why is fusion difficult?

  • 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!
  • 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


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