OCR 21st century C1,2,3

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

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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