chemistry word puzzle group 6

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Across
  1. 4. the burning of fuels in limited supply of oxygen
  2. 5. it catches fire easily
  3. 7. the energy from light provides the activation energy
  4. 12. group a group of atom in a molecule that dictates how the compound will react
  5. 14. breaking molecules into smaller ones
  6. 17. a reaction when one atom or group of atoms is replaced by another atom or group of atoms
  7. 18. less runny or more...
  8. 19. the family organic compounds with the OH functional group
  9. 20. water use to test whether hydrocarbons is unsaturated
Down
  1. 1. a family of organic acids, which have the COOH functional group
  2. 2. a method use to separated 2 or or more liquids that have different melting ponts
  3. 3. the process in which the enzymes in yeast break down sugars
  4. 6. when ethanol is left standing in air, bacteria bring about its oxidation to ethanoic acid
  5. 8. group alcohols contains the OH functional group
  6. 9. family of similar compounds that have the same functional group
  7. 10. a family of unsaturated hydrocarbons
  8. 11. no more of the solute will dissolve in it, at that temperature
  9. 13. a family of saturated hydrocarbons
  10. 15. a substance we use to provide energy
  11. 16. high flame shows that it evaporates easily