Crossword: Products from crude oil

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Across
  1. 1. __________ can be added to alkenes to turn them into alkanes.
  2. 5. When hydrocarbons burn, this gas is produced.
  3. 6. Incomplete combustion produces not carbon dioxide, but carbon _____________.
  4. 7. Cracking needs high temperatures and a ___________________.
  5. 8. These compounds have the general formula CnH2n+2
  6. 11. The correct name for aircraft fuel is what?
  7. 12. One of the heaviest fractions of crude oil is tar, also known as _______________.
Down
  1. 1. Compounds that contain hydrogen and carbon only are called this.
  2. 2. Substances in crude oil can be separated by fractional ___________________.
  3. 3. This substance was made by heat and pressure on dead marine plants and animals over a long period of time.
  4. 4. Alkenes turn ___________ water colourless.
  5. 7. This process makes useful hydrocarbon molecules, including alkenes.
  6. 9. CO2 is a _______ gas which contributes to global warming..
  7. 10. Alkenes contain a double __________.