OCR 21st century C1,2,3

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

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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