Crossword

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Across
  1. 4. thermal dissociation of molecules
  2. 7. estimates the quality of gasoline
  3. 10. separation due to different boiling points
  4. 11. reaction with oxygen
  5. 12. conversion of chemical substances
Down
  1. 1. liquid to dilute a substance
  2. 2. you need it for living
  3. 3. has a pH below 7
  4. 5. hydrocarbons with oxygen bridge
  5. 6. without it your car does not drive
  6. 8. reduces activation energy
  7. 9. inclusion of a substance on the surface of a solid