OCR 21st century C1,2,3

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