Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What is meant by the term 'nuclear fission'?
   • The process of splitting a nucleus is called nuclear fission.
2. When does Spontaneous fission occur?
   • Spontaneous fission is rare. Usually, for fission to occur the unstable nucleus must first absorb a neutron.
3. What happens to a nucleus undergoing fission?
   • The nucleus undergoing fission splits into two smaller nuclei, roughly equal in size, and emits two or three neutrons plus gamma rays. Energy is released by the fission reaction.
4. What type of energy do all fission products have?
   • All of the fission products have kinetic Energy.
5. What starts the chain reaction?
   • The neutrons may go on to start a chain reaction.
6. How is a chain reaction controlled?
   • The chain reaction is controlled in a nuclear reactor to control the Energy released.
7. How is the explosion of a nuclear weapon caused?
   • The explosion caused by a nuclear weapon is caused by an uncontrolled chain reaction.
8. What is nuclear fusion?
   • Nuclear fusion is the joining of two light nuclei to form a heavier nucleus.