OCR 21st century C1,2,3

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

Clues

  • Brine (salt water) contains Sodium Chloride, what process can we use to remove the chlorine? (12)
  • Crude oils contains chain of carbon and hydrogen, what are these chains called? (12)
  • In which gas would fuel burn better - pure oxygen or air? (4, 6)
  • What do we mostly use crude oil for? (4)
  • What element makes coal? (6)
  • When oxygen combines with another element, what is it known as? (9)
  • When oxygen is removed from a compound, what is this known as? (9)

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