Year 9 Christmas homework

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Across
  1. 2. The Haber process is used to make this chemical
  2. 4. Features which can be inherited show _______ variation
  3. 5. A reaction that gives out energy
  4. 6. Features which are influenced by our surroundings and experiences show _________ variation
  5. 9. Describes the differences between individuals of the same species
  6. 10. This gas is needed for fuels to burn
  7. 12. A chemical reaction in which a fuel is burned
Down
  1. 1. This solution is used to test for carbon dioxide gas
  2. 3. The name given to the turning effect of a force
  3. 5. Using electricity to split up a chemical
  4. 7. A reaction that needs or uses up energy
  5. 8. This molecule contains our genetic code
  6. 11. This is the point around which a lever turns