Combusion and chemical reactions

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