OCR 21st century C1,2,3

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

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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