C.2 Fossil Fuels Crossword

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Across
  1. 2. Premature ignition of fuel
  2. 6. (2n+1)H2 + nCO => C(n)H(2n+2) + nH2O
  3. 9. Process of refinement through separating into fractions
  4. 10. Without this, crude oil is useless
  5. 13. Contains sulfur impurities that must be removed before it can be used
  6. 15. Method of increasing the branching in a molecule
Down
  1. 1. The main element in fossil fuels
  2. 3. The cleanest form of fossil fuel
  3. 4. Breaking down larger molecules
  4. 5. Measure of a fuel's resistance to knocking
  5. 7. Has an octane number of 0
  6. 8. Process for improving quality of crude oil
  7. 11. Measure of one's contribution to global warming
  8. 12. Converting coal into synthesis gas
  9. 14. The most abundant fossil fuel