Cracking and Alkenes

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U L F X Y C I X K B L B C K D K D P L M F
T H E R M A L D E C O M P O S I T I O N N
U O W F C K Y G X F G M R R E F P D J N N
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N X P E R A C L V J P W G Q G L R S P A W
M U S C V O R L S A U X V J C O C X X M X

Clues

  • Alkene molecules can be used to make plastic AKA (8)
  • Alkenes are (12)
  • Alkenes are UN (11)
  • Cracking is a (7, 13)
  • In cracking, oil fractions are heated so they (9)
  • To heat the oil it can be passed over catalyst or... (5, 4, 5)

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