Combusion and chemical reactions

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Across
  1. 2. molecule
  2. 5. Energy
  3. 6. atoms
  4. 8. Gas
  5. 10. Formulas
  6. 12. heat
  7. 13. Carbondioxide
  8. 14. temperature
  9. 16. Oxygen
  10. 19. Water
  11. 20. Photosynthesis
Down
  1. 1. Fuel
  2. 3. equation
  3. 4. Hydrogen
  4. 7. substance
  5. 9. liquid
  6. 11. Light
  7. 15. elements
  8. 17. bonds
  9. 18. mass