OCR 21st century C1,2,3

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

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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