OCR 21st century C1,2,3

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

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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