Crude Oil Crossword

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Across
  1. 3. the process used to separate a mixture of hydrocarbons from crude oil fractional d__________
  2. 5. a resource which isn't being made any more or is being made incredibly slowly (f)
  3. 7. Fuel oil is used for large ships and p_____ stations
  4. 9. the type of combustion which produces soot
  5. 11. A fuel used for cars with 5-10 carbons
  6. 12. complete the equation hydrocarbon + oxygen --> carbon dioxide + _______?
Down
  1. 1. the most viscous fraction with >35 carbons
  2. 2. the number of covalent bonds carbon is able to form
  3. 4. A fuel used for aircraft
  4. 6. fuel for some cars and trains with 17-20 carbons (d)
  5. 8. the toxic gas which is formed when there is a lack of oxygen carbon _________
  6. 10. The most flammable fraction (_______ Gas)