OCR 21st century C1,2,3

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

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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