Technology tree for roleplaying game: Chemistry tech level.?

I need help thinking of example tech in the field of chemistry for my roleplaying game.
Level 0: Stone Age
Level 1: Medieval
Level 2: Industrial Revolution
Level 3: WWII
Level 4: Modern Era
Level 5: Post-modern
Level 6: Future
Level 7: Far Future

Originally posted by Darth Abonis
I need help thinking of example tech in the field of chemistry for my roleplaying game.
Level 0: Stone Age - Fire
Level 1: Medieval - Oil
Level 2: Industrial Revolution - Gasoline
Level 3: WWII - Jet Fuel
Level 4: Modern Era - Nuclear Energy
Level 5: Post-modern - safe renewable (bio)
Level 6: Future - same (water based)
Level 7: Far Future - perpetual energy machine.