Chemistry

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Across
  1. 2. the poisonous gas produced during incomplete combustion.
  2. 7. the lowest temperatureat which a substance catches fire.
  3. 9. dark oily liquid.
Down
  1. 1. unit used to expressed the calorific value.
  2. 3. obtained from the dead remains of living organisms.
  3. 4. essential for combustion
  4. 5. used as a fuel for vehicles.
  5. 6. the oxide dissolve in the rain water.
  6. 8. almost pure form of carbon.