OCR 21st century C1,2,3

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

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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