Combustion

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Across
  1. 3. a glowing gaseus part of a fire
  2. 5. something made of artificial material
  3. 8. A measure of how acidic or basic a substance or solution is
  4. 10. Physical properties change
  5. 11. Substances that are manufactured in the chemical industry
  6. 12. chemical properties change
  7. 14. process of burning something
  8. 17. Substance reacts with oxygen to give heat & light
  9. 18. particles of the chemical elements
Down
  1. 1. The lowest temperature at which a substance generates vapor
  2. 2. A state of rest or balance due to the eual action of opposing forces
  3. 4. Groups of Atoms
  4. 5. A fine black powder produced by incomplete combustion of organic matter
  5. 6. substance in general
  6. 7. Attraction between 2 or more atoms
  7. 9. Raw materials that reacts with one another & form products
  8. 12. Able to catch on fire & burn easily
  9. 13. Water molecule
  10. 15. the light & heat & especially the flame produced by burning
  11. 16. Action of setting something on fire or startin to burn