Combustion

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Across
  1. 2. process of burning something
  2. 5. a glowing gaseous part of a fire
  3. 6. physical properties change
  4. 7. something made of artificial material
  5. 10. a state of rest or balance due to the equal action of opposing forces
  6. 12. chemical properties change
  7. 13. substance ingeneral
  8. 15. substances that are manufactured in the chemical industry
  9. 17. a fine black powerder produced by incomplete combustion of organic matter
  10. 18. action of setting something on fire or starting to burn
Down
  1. 1. water molecule
  2. 2. able to catch on fire & burn easily
  3. 3. groups of atoms
  4. 4. the lowest temperature at which a substance generates vapor
  5. 8. the light & heat & especially the flame produced by burning
  6. 9. Substance reacts with oxygen to give heat & light
  7. 11. raw materials that reacts with one another & form products
  8. 14. attraction between two or more atoms
  9. 15. a measure of how acidic or basic a substance or solution is
  10. 16. particles of the chemical elements