.

123456
Across
  1. 1. simplest organic compound composed only of the elements carbon and hydrogen
  2. 3. the process by which petroleum can be separated into simpler components, called fractions, as they condense at different temperatures
  3. 5. a hydrocarbon that contains only single bonds
  4. 6. a hydrocarbon that contains at least one double or triple bond between carbon atoms
Down
  1. 2. all compounds that contain carbon with the primary exceptions of carbon oxides, carbides, and carbonates, all of which are considered inorganic.
  2. 4. the process by which heavier fractions of petroleum are converted to gasoline by breaking their large molecules into smaller molecules