Year 8

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Across
  1. 5. greenhouse gase
  2. 6. it is either taken in or given out during a chemical reaction
  3. 7. elements joined together
  4. 8. reaction when there is less oxygen
  5. 9. colour of the flame when it's an Incomplete combustion
Down
  1. 1. the end results in a chemical reaction
  2. 2. starting chemicals in a reaction
  3. 3. residue left behind due to Incomplete combustion
  4. 4. reaction when there is excessive amount of oxygen