Combustion reactions

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Across
  1. 2. A fuel often used in BBQ gas bottles
  2. 4. Powder left after something burns
  3. 5. A compound made of hydrogen and carbon
  4. 7. The visible glowing part of a fire
  5. 9. The main gas found in natural gas
  6. 10. The gas needed for burning to happen
  7. 13. A very fast combustion reaction
  8. 16. A chemical reaction that releases heat and light
  9. 17. A substance that burns to release energy
  10. 18. A product formed when hydrocarbons burn
Down
  1. 1. A gas produced when fuels burn completely
  2. 3. What combustion reactions release
  3. 6. Substances present before a reaction starts
  4. 8. The process of starting a fire
  5. 11. Energy released during combustion
  6. 12. Tiny particles and gases released by fire
  7. 14. Substances formed after a reaction
  8. 15. Black carbon particles from incomplete burning